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1. Top results related to javascript array

   • javascript array slice functionality in javascript maps

     Top Answer

     Answered Mar 12, 2019 · 4 votes

     You could take the keys, a subset of them and build a new Map.

     function getSlicedDataFromMap(startIndex, endIndex) { return Array .from(dataSet.keys()).slice(startIndex, endIndex) .reduce((m, k) => m.set(k, dataSet.get(k)), new Map)}

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     1/5

   • javascript:array to string in javascript:enclosed with single quotes

     Top Answer

     Answered Apr 27, 2017 · 10 votes

     You almost had it. Try this:

     array.map(x => "'" + x + "'").toString();-

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     2/5

   • Javascript array declaration: new Array(), new Array(3), ['a', 'b', 'c'] create arrays that behave differently

     Top Answer

     Answered Nov 23, 2011 · 60 votes

     Arrays have numerical indexes. So,

     a = new Array();a['a1']='foo';a['a2']='bar';-andb = new Array(2);b['b1']='foo';b['b2']='bar';

     are not adding elements to the array, but adding .a1 and .a2 properties to the a object (arrays are objects too). As further evidence, if you did this:

     a = new Array();a['a1']='foo';a['a2']='bar';console.log(a.length); // outputs zero because there are no items in the array-

     Your third option:

     c=['c1','c2','c3'];-

     is assigning the variable c an array with three elements. Those three elements can be accessed as: c[0], c[1] and c[2]. In other words, c[0] === 'c1' and c.length === 3.

     Javascript does not use its array functionality for what other languages call associative arrays where you can use any type of key in the array. You can implement most of the functionality of an associative array by just using an object in javascript where each item is just a property like this.

     a = {};a['a1']='foo';a['a2']='bar';-

     It is generally a mistake to use an array for this purpose as it just confuses people reading your code and leads to false assumptions about how the code works.

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     3/5

   • Javascript- Array functions :Create a function that accepts a single parameter as an argument: an array of strings

     Top Answer

     Answered Mar 05, 2021 · 1 votes

     The function forEach() is the wrong function here. You may want to use the function map():

     function getMultipleLengths(arr){ return arr.map(function(str){ return str.length; });}

     This function can be used to return a specific value for each array element and returns you a complete new array with the "new" values (in this case the lengths).

     You can find more information about map() on MDN.

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     4/5

   • Also try

     javascript array methods	javascript array filter
     javascript array length	javascript array push
     javascript array functions	javascript array find
     javascript array map	javascript array append

     5/5

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2. developer.mozilla.org › en-US › docsArray - JavaScript | MDN - MDN Web Docs

   developer.mozilla.org › en-US › docs

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   Dec 18, 2023 · Description. In JavaScript, arrays aren't primitives but are instead Array objects with the following core characteristics: JavaScript arrays are resizable and can contain a mix of different data types. (When those characteristics are undesirable, use typed arrays instead.)

3. www.w3schools.com › js › js_arraysJavaScript Arrays - W3Schools

   www.w3schools.com › js › js_arrays

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   Using an array literal is the easiest way to create a JavaScript Array. Syntax: const array_name = [ item1, item2, ... ]; It is a common practice to declare arrays with the const keyword. Learn more about const with arrays in the chapter: JS Array Const.

4. javascript.info › arrayArrays - The Modern JavaScript Tutorial

   javascript.info › array

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   Jan 24, 2023 · Arrays in JavaScript can work both as a queue and as a stack. They allow you to add/remove elements, both to/from the beginning or the end. In computer science, the data structure that allows this, is called deque .

5. www.w3schools.com › js › js_array_methodsJavaScript Array Methods - W3Schools

   www.w3schools.com › js › js_array_methods

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   JavaScript Array flat() ES2019 Introduced the Array flat() method. The flat() method creates a new array with sub-array elements concatenated to a specified depth.

6. developer.mozilla.org › en-US › docsArray() constructor - JavaScript | MDN - MDN Web Docs

   developer.mozilla.org › en-US › docs

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   Oct 4, 2023 · Arrays can be created using a constructor with a single number parameter. An array is created with its length property set to that number, and the array elements are empty slots. js

7. developer.mozilla.org › en-US › docsArrays - Learn web development | MDN - MDN Web Docs

   developer.mozilla.org › en-US › docs

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   May 10, 2024 · To understand what arrays are and how to manipulate them in JavaScript. What is an array? Arrays are generally described as "list-like objects"; they are basically single objects that contain multiple values stored in a list.

8. www.geeksforgeeks.org › javascript-arraysJavaScript Arrays - GeeksforGeeks

   www.geeksforgeeks.org › javascript-arrays

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   May 29, 2024 · You have two ways to create JavaScript Arrays: using the Array constructor or the shorthand array literal syntax, which is just square brackets. Arrays are flexible in size, so they can grow or shrink as you add or remove elements.

9. www.javascripttutorial.net › javascript-arrayThe Beginner's Guide to JavaScript Array with Examples

   www.javascripttutorial.net › javascript-array

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   This tutorial introduces you to JavaScript array type and demonstrates the unique characteristics of JavaScript arrays via examples.

10. www.javascript.com › learn › arraysJavaScript.com | Arrays

    www.javascript.com › learn › arrays

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    Arrays in JavaScript are container-like values that can hold other values. Learn about array functions, how to join two arrays, the JavaScript last element in an array, and length of array in JavaScript.

11. www.freecodecamp.org › news › the-javascript-array-handbookThe JavaScript Array Handbook – JS Array Methods Explained with...

    www.freecodecamp.org › news › the-javascript-array-handbook

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    May 21, 2021 · In this handbook, I'll teach you all about arrays in JavaScript. In programming, an array is a collection of elements or items. Arrays store data as elements and retrieve them back when you need them.