Thefind()method does not change the original array. Array Find Methods: MethodFinds indexOf()The index of the first element with a specified value lastIndexOf()The index of the last element with a specified value find()The value of the first element that passes a test ...
The find() method returns the value of the first element in an array that pass a test (provided as a function).The find() method executes the function once for each element present in the array:If it finds an array element where the function returns a true value, find() returns the ...
The findIndex() method returns the index of the first element in an array that pass a test (provided as a function).The findIndex() method executes the function once for each element present in the array:If it finds an array element where the function returns a true value, findIndex()...
The findIndex() method returns the index (position) of the first element that passes a test.The findIndex() method returns -1 if no match is found. The findIndex() method does not execute the function for empty array elements.The findIndex() method does not change the original array....
/** Create an array from string */console.log(Array.from("hello"));// Output : ["h", "e", "l", "l", "o"] /** Create an array from an other array and apply map method */console.log(Array.from([1,2,3],(x) =>x *2...
1、 Array.find() 使用.find()方法查找满足条件的数组的第一个元素。例如,让我们在汽车列表中找到第一辆经济实惠的汽车: constcars = [{brand:"Porsche",price:105000},{brand:"BMW",price:32000},{brand:"Skoda",price:15000},{brand:"Toyota",price:...
Javascript创建数组的基本方式有两种。第一种是使用Array构造函数。 var colors = new Array(); var colors = new Array(20); var colors = new Array("red","blue","green"); 另外一种是省略掉new符号: var colors = Array(3); var colors = Array("Greg"); ...
JavaScript Array.indexof() Method This method is used to find the index of the specified element, which is present in the array. If the element is not found, the method returns -1. conststrings = ["code","damn","web3"];console.log(strings.indexOf('damn'));// 1console.log(strings...
array.filter(function(currentValue,index,arr), thisValue)1. 该方法的第一个参数为回调函数,是必传的,它有三个参数: currentValue:必须。当前元素的值; index:可选。当前元素的索引值; arr:可选。当前元素属于的数组对象。 复制 const arr = [1, 2, 3, 4, 5]arr.filter(item item > 2) // 输出...
isArray(): Array.isArray(arr), 检查一个object是不是array,注意,这个method的caller 是Array,而不是arr keys(): arr.keys() 得到这个array的key的iterator。 toString(): arr.toString(), 把arr里所有元素转化成string,用逗号隔开。 join: arr.join(separator), 把array里东西转化成string,用separator隔开,...