如果callback函数在数组的任何元素上返回true,则array.some()返回true。 如果callback函数对所有元素都返回false,则array.some()返回false。 2.3、使用技巧 综上所述,array.some()常用来处理遍历数组元素并且寻找所需要的元素。 2.3.1、检查数组中是否有任何正数 举个最简单的例子,检查数组中是否有
javascript Array Methods(学习笔记) ECMAScript 5 定义了9个新的数组方法,分别为: 1.forEach(); 2.map(); 3.filter(); 4.every(); 5.some(); 6.reduce(); 7.reduceRight(); 8.indexOf(); 9.lastIndexOf(); 概述:首先,大多数的方法都接受一个函数作为第一个参数,并为数组里的每个...
somereturns abooleanvalue after passing each item in the source array through the test function that you pass in as the first parameter. This makes it well suited to the types of queries that require a simpleyesornoanswer. In this lesson we look at 2 practical use-cases forsome. The firs...
somereturns abooleanvalue after passing each item in the source array through the test function that you pass in as the first parameter. This makes it well suited to the types of queries that require a simpleyesornoanswer. In this lesson we look at 2 practical use-cases forsome. The firs...
JavaScript Objects HTML DOM Objects JavaScript Array Methods ❮ Previous Next ❯ Basic Array MethodsArray length Returns the length (size) of an array Array toString() Converts an array to a comma separated string of values Array at() Returns an indexed element from an array Array join() ...
In JavaScript, theArray.some()method takes a callback function and verifies whether at least one element in the array passes the test provided by the callback function. If at least one element passes the test, it returns "true". It returns "false", if the function returns false for all...
Different types of JavaScript Array Methods push() Adds one or more elements to the end of an array and returns the new length of the array. const numbers = [1,2,3]; numbers.push(4,5); console.log(numbers); //[1,2,3,4,5] JavaScript Copy pop() Removes the last element from ...
Object Oriented JavaScript JavaScript - Objects JavaScript - Classes JavaScript - Object Properties JavaScript - Object Methods JavaScript - Static Methods JavaScript - Display Objects JavaScript - Object Accessors JavaScript - Object Constructors JavaScript - Native Prototypes JavaScript - ES5 Object Methods...
Array Tutorials: Array Tutorial Array Const Basic Array Methods Array Search Methods Array Sort Methods Array Iteration MethodsBrowser Supportsome() is an ECMAScript3 (JavaScript 1999) feature.It is supported in all browsers:Chrome Edge Firefox Safari Opera IE Yes Yes Yes Yes Yes Yes...
JavaScriptArray Methods The strength of JavaScript arrays lies in the array methods. Converting Arrays to Strings The JavaScript methodtoString()converts an array to a string of (comma separated) array values. Example varfruits = ["Banana","Orange","Apple","Mango"]; ...