trueifsearchValueis found anywhere within the array falseifsearchValueis not found anywhere within the array Example 1: Using includes() method letlanguages = ["JavaScript","Java","C","C++"]; // checking whether the array contains 'C'letcheck1 = languages.includes("C"); console.log(check...
find() Returns the first value of the array element that passes a given test. findIndex() Returns the first index of the array element that passes a given test. forEach() Calls a function for each element. includes() Checks if an array contains a specified element. sort() Sorts the el...
array.includes() This is a simple function forchecking whether an array contains a particular value. vararray=[4,5,3,7,'Hello',2,1,true,false,0];console.log(array.includes(3));console.log(array.includes(9));console.log(array.includes('Hello')); array.includes(value) array.find() ....
Theincludes()method in JavaScript only checks for the presence of a single value in an array. If you want to check for the presence of multiple values in an array, you can use theevery()method in combination with theincludes()method. JavaScript array includes multiple values example Simple e...
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.Example const cars = ["Saab", "Volvo", "BMW"]; Try it Yourself » Spaces and line breaks are not ...
JavaScript Array.includes() Method includes()method determines whether an array includes a certain value among its entries, returning true or false as appropriate. Let’sLets take the same example of animals constanimals = ["lion","tiger","elephant","deer"];console.log(animals.includes('tiger...
Array 1.解构 1.1解构数组,获取数组中的值,不会破坏原数组 constarr1=[2,3,4];const[x,y,z]=arrconsole.log(x,y,z)console.log(arr) 1.2解构变量中间如果存在间隔,表示跳过该值 let[a,,c]=arr1console.log(a,c) 1.3交换数组中值的顺序
❮ Previous JavaScript Array Reference Next ❯ Example 1// Create an Array const ages = [32, 33, 16, 40];// Create a Test Function function checkAge(age) { return age > 18; }// Are all ages over 18? ages.every(checkAge); ...
21.Array.prototype.includes,Promise 该方法判断一个数组是否包含一个指定的值,返回布尔值 代码语言:javascript 复制 let da1 = [1,2,3]; console.log(da1.includes(2)); 代码语言:javascript 复制 arr.find(function(item){ return item === 1; }) arr.filter(function(item){ return item === 2; ...
特别是在某些情况下,我们可能希望停止程序或在发生意外错误时通知用户。 例如: 程序试图打开一个不存在的文件 网络连接断开 用户输入了无效的内容 在所有这些情况下,我们程序员都会创建错误,或者让编程引擎为我们创建一些错误。 在创建错误之后,我们可以向用户发送一条消息,或者完全停止执行。