javascript sort array

JavaScript Array sorting methods. The array sort JavaScript function is used to sort array items. Array Sort Methods. // items is ['adieu', 'café', 'communiqué', 'éclair', 'premier', 'réservé'], // temporary array holds objects with position and sort-value, // sorting the mapped array containing the reduced values, https://github.com/mdn/interactive-examples, Creating, displaying, and sorting an Previous: Write a JavaScript program which accept a number as input and insert dashes (-) between each two even numbers. There is an open source library available called mapsort which applies this approach. Topic: JavaScript / jQuery Prev|Next. Hence here is a simple solution to overcome this problem. It will work good for string array but not for numbers. See the Pen JavaScript - Sort the items of an array- array-ex- 7 by w3resource (@w3resource) on CodePen. However, data types (string, number, and so on) can differ from one array to another. © 2005-2021 Mozilla and individual contributors. Array sorting can be performed with strings and numbers. If the second item is smaller, we swap it with the first. The sort() method is used to sort the elements of an array in order and returns the new array. (e, é, è, a, ä, etc. Quick example on how to use JavaScript to sort arrays by index values. jeanmask. Sort an array of objects by multiple properties in JavaScript Javascript Web Development Front End Technology Object Oriented Programming Suppose, we have an array of objects like this − As shown in the output above, each element has been evaluated multiple times e.g., Amazon 4 times, Congo 2 times, etc. In the above-given example, we are returning a positive value, so that the function communicates to sort() that the object b takes precedence in sorting over the object a. The sort() Method¶. To customize the sort order, you pass it a function to compare two items in the array. We are going to use two nested loops to sort the array in the given order. It can perform this task in the following orders: numeric or alphabetical, descending or ascending. When we return 1, the function communicates to sort() that the object b takes precedence in sorting over the object a.Returning -1 would do the opposite.. On the other hand, when compared to other quadratic time complexity algorithms like Bubble Sort , Selection Sort holds itself quite well, outperforming Bubble Sort and its variants, as well as Gnome Sort . Introduction to JavaScript Array Sort Sorting means arrange items in a specific order. Generally speaking, sort is a “black box”: we throw an array and a comparison function into it and expect the array to be sorted. For example, "banana" comes before "cherry". Following is the syntax of sort() function in JavaScript. Introduction In this article, we will explain what the idea behind Insertion Sort is and implement it in JavaScript. The inner loop will loop till the length of the first loop and swap the elements which are in the wrong order. The aim of this post was to illustrate the Selection Sort Technique. Whenever you define an array, it will have a publicly accessible sort() and reverse() methods and just like any public method, these methods can be called through your array variable with dot notation. The sort() method will use the compare function to determine the orders of elements. Sorting an array in lexicographical order Javascript’s sort() method can be used to sort an array of data.. Third, walk the temporary array to get an array with the right order. The function calculates 40 - 100 (a - b), and since the result is negative (-60), the sort function will sort 40 as a value lower than 100. If a and b are two elements The following illustrates the syntax of the sort() method: The sort() method accepts an optional argument which is a function that compares two elements of the array. The literal notation array makes it simple to create arrays in JavaScript. First sort by an integer, next sort by a string. This method can be used to sort all elements of an array. Array sort method in Javascript : Javascript array has one method called sort(). We work in this way: we pick the first item. Copyright © 2021 by JavaScript Tutorial Website. For example, \"banana\" comes before \"cherry\". This will be repeated until all the elements of the array are sorted. Practice Exercise: Write a program in JavaScript to sort following list in ascending order using Selection Sort Algorithm.var nums = [34, 23, 12, 45, 9, 1, 24]; Sort the list present in Q1 in descending order. To implement this, you follow these steps: In this tutorial, you have learned how to use the JavaScript Array sort() method to sort arrays of strings, numbers, dates, and objects. The compare function compares all the values in the array, two values at a time (a, b). Introduction to JavaScript Array sort () method The sort () method allows you to sort elements of an array in place. To sort the array by its string length, we can use the Array.sort() method by passing compare function as an argument.. sorting. Firefox Full support 1.5. In real-world, this is the most commonly faced problem and Javascript provides one simple way to solve it. Implements insertion sort and binary search for fast insertion and deletion. Sorted arrays may be installed on node.js via the node package manager using the command npm install sorted-array. Hence here is a simple solution to overcome this problem. elements are sorted by converting them to strings and comparing strings in UTF-16 code Suppose we have an array of numbers, and we want to sort it by element size. The array sort JavaScript function is used to sort array items. We will cover both arrays with strings and arrays with objects. To sort an array of numbers numerically, you need to pass into a custom comparison function that compares two numbers. Sorting is nothing but putting all the elements of a list in a certain order. Selection Sort in Javascript Algorithm of Selection Sort. If compareFunction is not supplied, all non-undefined array elements are sorted by converting them to strings and comparing strings in UTF-16 code units order. pair \uD655\uDE55 will be sorted before the character The sort method available on the Array prototype allows you to sort the elements of an array. Let’s look at these methods. Unicode order. The sorted array. The sort() method is used to sort the elements of an array in order and returns the new array. You could have an array of objects, and you could compare an object property, like sorting by age, or alphabetically by last name. The JavaScript Array.sort() method is used to sort the array elements in-place and returns the sorted array. The method also has a pre-set order, in which case the items are to be sorted in ascending alphabetical order. How to sort multidimensional array using javascript. The arr.sort () method is used to sort the array in place in a given order according to the compare () function. being compared, then: So, the compare function has the following form: To compare numbers instead of strings, the compare function can subtract b IE Full support 9. These days JavaScript is the foundation of very new technologies, Front-End frameworks, etc. The more work a compareFunction does and the more elements there Chrome Full support 1. The sort() method. For arrays of numbers, refer to our previous post on sorting array of numbers.. filter. Array sort function sort() is … Bubble sort implementation in javascript. How to create a custom sort order in javascript June 14, 2019. image from undraw.co. Using JavaScript's sort Method for Sorting Arrays of Numbers The sort method available on the Array prototype allows you to sort the elements of an array and control how the… alligator.io An implementation of John von Neumann's sorted arrays in JavaScript. In this example, the sort() method places 10 before 2 because the string “10” comes before “2” when doing a string comparison. The sort method available on the Array prototype allows you to sort the elements of an array and control how the sorting should be done. The numeric arrays are sorted without a compare function, then sorted Instead, use items.sort() from the JavaScript inbuilt Array method. \uFF3A. // temporary array holds objects with position, // sorting the lengths array containing the lengths of, Splitting a String into Substrings: split(), Locating a Substring Backward: lastIndexOf(), Extracting a Substring from a String: substring(), Removing Whitespaces from Both Ends: trim(), Check If Every Element Passes a Test: every(), Check If At Least One Element Passes a Test: some(), Concatenating Array Elements Into a String: join(), First, extract the actual values into a temporary array using the. Depending on the compareFunction's nature, this may yield a high from a. array. It accepts an optional callback function that you could use to tailor the sorting mechanism to your specific needs. Javascript sort method is used to sort the elements of an array and return new array. Note : In UTF-16, Unicode characters above \uFFFF are Sorting strings can get quite opinionated because of how the sort method works. are to sort, it may be more efficient to use map for Number, string, boolean, null, undefined, object, function, regular expression, and other structures can be any type of array elements. Code: Output: The default sort order is ascending, built upon converting the The default sort order is ascending, built upon converting the elements into strings, then comparing their sequences of UTF-16 code units values. It is defined as below : When comparing 40 and 100, the sort () method calls the compare function (40, 100). By default, the sort() method sorts the array elements in ascending order with the smallest value first and largest value last. returns the sorted array. For sorting strings with non-ASCII characters, i.e. Learn how to use array sort method in javascript.. The sort() function works in two ways: 1. ), strings from languages other than English, use In this example, you will learn to write a JavaScript program that will sort an array of objects by property values. The JavaScript Tutorial website helps you learn JavaScript programming from scratch quickly and effectively. When sorting an array, we can use the sort … Array Sorting means to arrange the elements in either ascending or descending order. Javascript array sort() method provides an easy way to sort the array elements. All undefined elements are sorted to the end of the array. To analyse the best method of doing this in terms of performance I looked at a JS perf test for sorting objects . The sort() method sorts the elements of an array in place and The sort( ) method sorts the array elements in place and returns the sorted array. In this article, we will look at sorting an array alphabetically in JavaScript. One of the most commonly work in JavaScript is working with JSON arrays. If you omit the compare function, the sort() method sorts the elements with the sort order based on the Unicode code point values of elements as mentioned earlier. ; If our return condition is 0 then nameA and nameB positions are unchanged. Array sort method is used to sort JavaScript Array if manual code will be written to write the array, it will take a long time. When sorting an array, we can use the sort … Summary: in this tutorial, you will learn how to use the JavaScript Array sort() method to sort arrays of numbers, string, and objects. Suppose you have an array of numbers named scores as in the following example. Arrays of objects can be sorted by comparing the value of one of their properties. The sort() method allows you to sort elements of an array in place. If the compare function return value is a.length - b.length, it sorts the array … This sort method converts the array elements into strings and performs a lexicographical sort on it by default. Insertion Sort is one of the simpler sorting algorithms. Last week, my friend Andrew Borstein was playing around with a JavaScript upvoting system, and asked: I want to sort an array based on two properties. Thanks to JavaScript, we already have predefined array sorting methods. Thus the character formed by the surrogate using one. Array.sort(): The Array.sort() method accepts the callback function as its first argument and returns the sorted array. Array Sorting means to arrange the elements in either ascending or descending order. This technique is called Schwartzian Transform. The compare function of the sort() method accepts two arguments and returns a value that determines the sort order. The source for this interactive example is stored in a GitHub repository. So we have inbuilt method to help us out. JavaScript: Sort Number Arrays. The sort() method allows you to sort elements of an array in place. To resolve this, you use the localeCompare() method of the String object to compare strings in a specific locale, like this: The elements of the animaux array now are in the correct order. To understand this example, you should have the knowledge of the following JavaScript programming topics: If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. it doesn't contain Infinity and NaN): The sort method can be conveniently used with You cannot reduce the number of times that comparison function is executed. The sort () method accepts an optional argument which is a function that compares two elements of the array. Therefore, to sort employees by hire date, you first have to create a valid Date object from the date string, and then compare two dates, which is the same as comparing two numbers. The sort() method will sort elements based on the return value of the compare() function with the following rules: To fix the issue of sorting the number, you can use the following syntax: Or you can define the comparison function using the arrow function syntax: And the following is the simplest since the elements of the array are numbers: Suppose you have an array of string named animals as follows: To sort the elements of the animals array in ascending order alphabetically, you use the sort() method without passing the compare function as shown in the following example: To sort the animals array in descending order, you need to change the logic of the compare function and pass it to the sort() method as the following example. One of the most common uses of … JavaScript Array sorting methods. If the method is omitted then the array is sorted in ascending order. Step 2 – then apply the selection sort algorithm on an array. Edge Full support 12. array, About the stability of the algorithm used strings with accented characters By default, the sort order is ascending, built upon converting the elements into strings and then comparing their sequences of UTF-16 code unit values. The hire date data is stored in the hireDate property of the employee object. Array Sort Methods. But due to the utter randomness of the comparison the black box goes mad, and how exactly it goes mad depends on the concrete implementation that differs between engines. String.localeCompare. Whenever you define an array, it will have a publicly accessible sort() and reverse() methods and just like any public method, these methods can be called through your array variable with dot notation. The following function will sort the array in ascending order (if elements are sorted according to the return value of the compare function (all encoded as two surrogate code units, of the range These days JavaScript is the foundation of very new technologies, Front-End frameworks, etc. How to Sort Array Alphabetically in JavaScript JavaScript arrays have the sort () method, which sorts the array elements into alphabetical order. The order of the property is similar to that given by the object manually in a loop applied to the properties. Suppose that you have an array of employee objects as follows: Let’s look at these methods. ; If our return condition is 1 then nameB is placed before nameA in resulting array. If we return a negative value, it will do just the opposite. This can cause issues when sorting number arrays. appear in the right order. The details don’t change. The following illustrates the syntax of the compare function: The compare() function accepts two arguments a and b. So an array of objects might look like this: [ { title: 'Apple', votes: 1 }, { title: 'Milk', votes: 2 }, { title: 'Carrot', votes: 3 }, { title: 'Banana', votes: 2 } ] and then be sorted into this Array.sort(): The Array.sort() method accepts the callback function as its first argument and returns the sorted array. Answer: Use the sort() Method. This function sorts the elements in string format. If compareFunction is supplied, all non-undefined array ; If our return condition is 0 then nameA and nameB positions are unchanged. The sort method available on the Array prototype allows you to sort the elements of an array. The best-case performance of Selection Sort is also O(n 2), so checking whether the array or list is sorted or not is also really inefficient. by V8 engine. We can sort simple elements like string, integer or any complex objects like we have seen above. But every time implementing the advance sorting algorithm is not feasible. If compareFunction is not supplied, all non-undefined array The following example sorts the scores array numerically in ascending order. Sorting a list of data is one of the most common task we face while programming. Sorting arrays in JavaScript is done via the method array.sort (), a method that's probably as much misunderstood as it is underestimated. In a numeric sort, 9 comes The following example shows how to sort the employees by salary in ascending order. In this tutorial, we will learn to sort such arrays. undefined elements are sorted to the end of the array, with no call to As the output shows, when a compare Besides returning the sorted array, the sort () method changes the positions of the elements in the original array. This sort method converts the array elements into strings and performs a lexicographical sort on it by default. The method also has a pre-set order, in which case the items are to be sorted in ascending alphabetical order. But, you can still sort an array of integers correctly through utilizing a compare function, as shown in the following example: Improve this sample solution and post your code through Disqus. For example: As you see, the écureuil string should come before the zèbre string. How sorting an array by Date in Javascript work? In JavaScript, the sort () function is used to sort an array. Last modified: Jan 9, 2021, by MDN contributors. This function can compare those characters so they The JavaScript sort() method, here you will learn about javascript sort() method. Sort() function. To sort the employees array by name property case-insensitively, you pass the compare function that compares two strings case-insensitively as follows: Suppose, you wish to sort employees based on each employee’s hire date. To sort an array of numbers numerically in descending order, you just need to reverse the logic in the compare function as shown in the following example: The following is an array of employee objects, where each object contains three properties: name,salary and hireDate. For example: if numbers are sorted as string, than “75” is bigger than “200”. Sort array JavaScript methods can help you with sorting arrays in alphabetical, reverse, random, numerical, descending and ascending order. Sorting a list of data is one of the most common task we face while programming. Step 1 – take an unsorted array and make it sorted an array with the help of selection sort. Suppose you have an array that contains elements in both uppercase and lowercase as follows: To sort this array alphabetically, you need to use a custom compare function to convert all elements to the same case e.g., uppercase for comparison and pass that function to the sort() method. So, this is how you sort an array by date in Javascript. How it work with string, numbers and character. For arrays of numbers, refer to our previous post on sorting array of numbers.. This can cause issues when sorting number arrays. The callback function could calculate other properties too, to handle the case where the color is … Arrays can also be sorted. Learn how to use array sort method in javascript.. before 80, but because numbers are converted to strings, "80" comes before "9" in the Object.keys()¶ Object.keys() returns an array where elements are strings corresponding to the enumerable properties found upon the object. Sorting arrays in JavaScript is done via the method array.sort(), a method that's probably as much misunderstood as it is underestimated. Try to run the example shown above and drop one comment below if you have any queries. This function sorts the elements in string format. Sorted Array. In the previous posts, we learnt about adding elements to the Array.In this post, we shall understand how to sort JavaScript array in different order. If the method is omitted then the array is sorted in ascending order. However, it is just a string that represents a valid date, not the Date object. If the compare function is omitted, then the sort () method will sort the element based on the elements values. copy is made. Note that the array is sorted in place, and no In this article, we will look at sorting an array alphabetically in JavaScript. A Few Minutes Of Code. sort will pass to your function two items in the array (conventionally the parameters a and b in your function). Besides returning the sorted array, the sort() method changes the positions of the elements in the original array. The sort() method is working fine with the strings with ASCII characters. Sorting an Array with Strings. The compareFunction can be invoked multiple times per element within the Output: Geeks,for,Geeks Geeks,Geeks,for The arr.sort() method is used to sort the array in place in a given order according to the compare() function. If our return condition is -1 then nameA is placed before nameB in resulting array. The sort() function is invoked using an array. Second, sort the temporary array with the elements that are already evaluated (or transformed). While calling sort() by itself simply sorts the array in lexicographical (aka alphabetical) order, the sky's really the limit once you go beyond the surface. overhead. One of the most commonly work in JavaScript is working with JSON arrays. Sorting arrays using bubble sort in JavaScript Javascript Web Development Front End Technology Object Oriented Programming We are required to write a JavaScript function that takes in an array of literals and sorts it using bubble sort. sorted arrays. The sort() method sorts the elements of an array in place and returns the sorted array. Sorting an array order by frequency of occurence in javascript - gist:c90b3336ee639c89ae13b98825c9d9ca The idea is to traverse the array once to extract the actual values used for ; If our return condition is 1 then nameB is placed before nameA in resulting array. In addition to that, when our input array size is very small (10-20 elements), Insertion Sort can even outperform Quicksort and Merge Sort. Be aware that the sort method operates on the array in place. Customizing the Array Sort. array.sort() By default, the sort() function sorts in ascending order. JavaScript arrays come with a built-in sort method. The sort () function can be used in various ways. Installation. separately into account for the comparison. function expressions: ES2015 provides arrow function expressions with even shorter syntax. units order. sorting into a temporary array, sort the temporary array, and then traverse the For example: if numbers are sorted as string, than “75” is bigger than “200”. Sorting strings can get quite opinionated because of how the sort method works. Object.keys() is used to return enumerable properties of a simple array, of an array-like an object, and an array-like object with random ordering. However, you can reduce the work that the comparison has to do. The value of each code unit is taken To fix this, you need to pass a compare function to the sort() method. Javascript’s sort() method can be used to sort an array of data.. The difference is that it compares the salary property of two objects instead. Learn about JavaScript sort ( ) function works in two ways: 1 either ascending or order... That you could use to tailor the sorting mechanism to your specific needs displays the original.. Applied to the compare function to the end of the range \uD800-\uDFFF ) by default, the sort ( method. Example on how to use array sort function sort ( ) method the. Separately into account for the comparison idea to have javascript sort array items in an array of numbers of... Most commonly faced problem and JavaScript provides one simple way to sort array. Sort method works by comparing the value of each code unit is taken separately into account for the has. Project, please clone https: //github.com/mdn/interactive-examples and send us a pull request and 100, the sort )... Code unit is taken separately into account for the comparison has to do is via... Mechanism to your specific needs method available on the implementation leaving the array... Before `` cherry '' is an open source library available called mapsort which applies this approach by object! Valid date, not the date object how sorting an array in place do just the opposite string! Sort JavaScript function is used to sort array alphabetically in JavaScript, the sort order is ascending, upon. Refer to our previous post on sorting array of numbers named scores in. Is 0 then nameA and nameB positions are unchanged objects can be to... Javascript sort ( ) method will sort an array of numbers named as! Javascript June 14, 2019. image from undraw.co in two ways: 1 days JavaScript is working with! Of performance I looked at a time ( a, ä, etc not for numbers these days JavaScript the... Temporary array with the right order comma-separated array elements in the array by date in JavaScript:..., \ '' banana\ '' comes before `` cherry '' property is similar to that given by surrogate! Objects like we have an array in lexicographical order the sort ( ) from the Array.sort... Two values at a time ( a, ä, etc have predefined array sorting means items! “ 200 ” way to solve it two values at a JS perf test sorting! Types of elements can get quite opinionated because of how the sort order, you need pass... Third, walk the temporary array to get an array in place and returns new... Properties found upon the object according to the sort order is ascending built... It simple to create a custom comparison function is executed example creates four arrays displays! New technologies, Front-End frameworks, etc and drop one comment below if you 'd like contribute! Orders: numeric or alphabetical, reverse, random, numerical, descending and ascending.... This interactive example is similar to that given by the surrogate pair will... Javascript JavaScript arrays can contain different types of elements - strings, then the array last modified: Jan,... Has one method called sort ( ) function in JavaScript: JavaScript array sort ( function... Stored in a specific order in order and returns the sorted array if our return condition -1... Function return value is a.length - b.length, it will work good for string array but not numbers. Quick example on how to use the compare function compares all the values in the wrong order output. The number of array elements in place in a GitHub repository by passing function! Time and space complexity of the first enumerable properties found upon the object manually a! Javascript function is omitted then the sort order in JavaScript algorithm of Selection sort (,! Numbers are sorted to the example of sorting an array by its string,! Built upon converting the elements that are already evaluated ( or transformed ) property.. Comparison has to do: 1 alphabetical order sort such arrays which are the. The method is used to sort elements of an array in place and returns the array... We pick the first loop and swap the elements values and expect functions to not side-effects. The surrogate pair \uD655\uDE55 will be repeated until all the values in the array sort method available on compareFunction. Pre-Set order, you need to pass a compare function multiple times for each element in the array (! That you could use to tailor the sorting mechanism to your function two items in the following orders: or. Of each code unit is taken separately into account for the comparison two even.. Sorting means to arrange the elements in either ascending or descending order as input insert. The output shows, when a compare function multiple times for each element in the hireDate property of property... Seen above node package manager using the command npm install sorted-array in order and returns sorted... Of array elements this article, we can sort simple elements like string than! Use items.sort ( ) function in JavaScript to sort an array of numbers, undefined, etc with... At sorting an array in place how sorting an array in place frequency of occurence in JavaScript is via... Will loop till the length of the property is similar to the compare function to the enumerable properties found the. Has one method called the sort ( ) method changes the positions of the first post your through... This will be repeated until all the elements of the most common task face! Value, it is just a string that represents a valid date, not the date object so ). In an array of data scores as in the array elements is increasing, it will potentially decrease performance! Compare those characters so they appear in the hireDate property of two objects instead transformed ) and b your! Frameworks, etc order by frequency of occurence in JavaScript June 14, 2019. image from undraw.co days JavaScript working! Employee object to do given order according to the sort ( ) method sorts the in!, which sorts the array in lexicographical order the sort can not be guaranteed as it on.: in UTF-16, Unicode characters above \uFFFF are encoded as two surrogate code values. – take an unsorted array and make it sorted an array in order and returns the sorted array Neumann. Refer to our previous post on sorting array of numbers named scores as in original. É, è, a, ä, etc a built-in method called (!, which sorts the array ( conventionally the parameters a and b in your function two items in array. Array, then the array is sorted in ascending order with the help of Selection sort the method is then! The best method of doing this in terms of performance I looked at a JS test... Tutorial, we will cover both arrays with strings and performs a lexicographical sort on it by default is in! That wrap optional, comma-separated array elements b.length, it will do the... Like to contribute to the interactive examples project, please clone https: //github.com/mdn/interactive-examples and send us pull... Javascript JavaScript arrays have the sort ( ) method calls the compare function ( 40, 100 ) loop swap! Always an appropriate solution sorting algorithm is not feasible method alone is not feasible good idea to all. The literal notation array makes it simple to create javascript sort array in JavaScript are strings corresponding to the properties this:... Sort such arrays the second item is smaller, we can use the Array.sort ( ) method the... Javascript program which accept a number as input and insert dashes ( - ) each. Available called mapsort which applies this approach you with sorting arrays in JavaScript binary search for fast insertion deletion. Which accept a number as input and insert dashes ( - ) between each two even numbers analyse best. Similar to the enumerable properties found upon the object reverse, random, numerical, descending ascending! Are sorted without a compare function is used to sort array items very technologies. Instead, use String.localeCompare solution and post your code through Disqus of of... Performance I looked at a JS perf test for sorting objects Selection sort most commonly faced and! 0 then nameA is placed before nameB in resulting array the end of the Day we return a value! It simple to create arrays in JavaScript algorithm of Selection sort algorithm on an.. Javascript ’ s sort ( ) method sorts the scores array numerically ascending... Method also has a pre-set order, in which case the items are to be sorted in order... Its string length, we will look at sorting an array by its string length we! An easy way to solve it program that will sort an array alphabetically in,! In your function two items in a certain order a new array items.sort ( method! Implements insertion sort is one of their properties this example, \ '' cherry\ '' these days JavaScript is foundation! Faced problem and JavaScript provides one simple way to sort elements of an array with help... Then the array in place and returns a value that determines the sort can be... Use a functional programming style and expect functions to not have side-effects JavaScript inbuilt array method how sort... Command npm install sorted-array we swap it with the first item we swap it the... Element within the array in order and returns the sorted array be used to sort array values.. Dashes ( - ) between each two even numbers to overcome this problem, values! 14, 2019. image from undraw.co units, of the employee object, use String.localeCompare foundation of new. Array with the first loop and swap the elements in either ascending descending! English, use items.sort ( ) method is used to sort an array in order returns!

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