iterating array in javascript

This article mainly introduces two methods of javascript array output, which involve common techniques of javascript Array traversal. If you need them, refer to the example below to illustrate the two methods of javascript array o

The following code has a good idea without considering the running efficiency. But in actual applications, we still use split or join to implement Array Operations. Two custom js functions that implement mutual conversion between strings and arrays hope to be useful to you: The Code is as follows: Function StringToArray (str, substr ){/* Function: Splits a string into an Array Based on the specified strin

This article describes how to use the slice function in JavaScript to obtain some elements of an array. It involves the use of slice methods in javascript and is of great practical value, for more information about how to use the slice function to obtain some elements of an array, see the example in this article. Share

Extends the Array object and adds the binary search function to it to improve the search efficiency. In Javascript, we can use the prototype keyword to add new attributes or methods to an object. The following is a method for adding the binary search function to an Array object: The Code is as follows: Array. protot

This article mainly introduces the implementation code of an array in Javascript. For more information, see. I hope to help you with the JS interview questions of a company in. I am a javascript Engineer (go to google) The interviewer asked me how to clone an array. At that time, I thought that js objects do not hav

":, "cpuhz_use" :,}, {"cpu":, "cpuhz":, "cpuhz_use ":,}, {"cpu":, "cpuhz":, "cpuhz_use" :,}, {"cpu":, "cpuhz":, "cpuhz_use" :,}]; // sort data = sort_object (data, 'cpuhz _ use') according to the cpuhz_use field; console. log (data ); Usage 3: Var data = [,]; // sort one-dimensional arrays in ascending order. data = sort_object (data); console. log (data); // sort one-dimensional arrays in descending order data = sort_object (data, null, true); console. log (data ); Us

The Javascript string has an indexOf method that can return the position of a character in the specified string. This article describes how to add a similar method to the Javascript array. [Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute] Run the above Code. If you want to see how to use

Interesting JavaScript Array code example. For more information about js learning, see. Pay attention to the following situations. First: The Code is as follows: Var lennon = Array ();Lennon ["name"] = "windy ";Lennon ["year"] = "1989 ";Lennon ["living"] = true;Alert (lennon. length ); Result: lennon. length is 0. Cause: Add an

This article mainly introduces how to use javascript to determine whether an array is repeated. It involves javascript's array-related operation skills and is of great practical value, for more information about how to use javascript to determine whether an array is repeated

Javascript (1) Summary of javascript Array usage (2) // 1. array sorting. The default value is ascending. The sort () method calls the toString () of each item in the array, and then compares the obtained string to sort the result. // sort (): returns the sorted

Objective The array object in JavaScript, which we often say, is primarily used to encapsulate and manage multiple data of any type. Array objects are supported by all major browsers. We all know that the array instance has these four methods: Push, pop, shift, Unshift. We all know the push + POP implementation stac

(1) Join function: Converts and joins all elements in an array to a string. Cases:　　　　[JavaScript]View Plaincopyprint? function Joindemo () { var a, b; A = NewArray (0,1,2,3,4); b =a.join ("-"); //Delimiter return (b); //Return to b== "0-1-2-3-4" } (2) Length function: Returns the lengths of the array. Cases:　　　[

This article mainly introduces how to implement random array sorting in JavaScript, involving techniques related to javascript Array traversal and sorting, for more information about how to use JavaScript to sort arrays randomly, see the following example. Share it with you

We often say that JavaScript supports json native, because json is a flexible application of JavaScript Object. For more information about JSON objects, see wikipedia (http://zh.wikipedia.org/zh-cn/JSON) and the official website (http://www.json.org/json-zh.html ). We often say that JavaScript supports json native, because json is a flexible application of

JavaScript combines two arrays and removes repeated items. javascript Array This example describes how to merge two arrays in JavaScript and remove repeated items. Share it with you for your reference. The specific implementation method is as follows: Array. prototype. uni

(function (Item,index,arr) {});//iterates over each item of the array, processes each item, returns the processing result of each item, and forms a new array to returnColor.foreach (function (Item,index,arr) {});//iterate over each item of an array13, the reduction methodReduce (function (prev/* */,cur/* The current item */,index/* the current item's position */,arr/* the

This article mainly introduces how to delete array elements by JavaScript value. It involves some techniques related to javascript operations on arrays and is very useful, for more information about how to delete array elements by JavaScript value, see the following example.

Array deduplication is a common requirement. we will temporarily consider repeated arrays of the same type. It mainly aims to clarify the ideas and consider the performance. The following methods are available on the internet. here is a brief summary. Summary of deduplication methods for javascript arrays Array. prototype. unique1 = function () {var n = []; //

Copy codeThe Code is as follows:Array. prototype. ArrayInsertAfter = function (Num, obj){Var tempArr = new Array ();Var l = this. length;For (var I = 0; I {TempArr. push (this. shift ());}L = tempArr. length;For (var I = 0; I {This. push (tempArr. shift ());If (I = Num){This. push (obj );}}Return this;}How to use JavaScript splice ()Definition and usageThe splice () method is used to insert, delete, or repl

Class Array Object Ah, what difference does it have with a real array object? Can't say that old Maitai, only know the function of arguments object is a class array object, also has the length property, other? Dry Goods on the ministry:First, let's talk about arrays:1, the Length property is automatically updated when a new element is added to the list.2, set len