console.log(contains(arr, 5)); [True] Visual Presentation: Sample Solution: JavaScript Code: // Function to check if an array contains a specific element function contains(arr, element) { // Iterate through the array for (var i = 0; i < arr.length; i++) { // Check if the current...
includes()Check if an array contains the specified element indexOf()Search the array for an element and returns its position isArray()Checks whether an object is an array join()Joins all elements of an array into a string keys()Returns a Array Iteration Object, containing the keys of the ...
{id:3,name:"Fruit jam",category:"food"}];Copy As you can tell, we have an array of objects calledproductsand now let’s say, we want to check if this array has at least one object that hascategoryset as“grocery”. Turns out, it’s pretty easy to check this using theArray.proto...
方法一：array.indexOf() 此方法判断数组中是否存在某个值，如果存在，则返回数组元素的下标，否则返回...
After adding the string "apple" to the array, the array contains two elements, and has a length of 2. This gets returned from the addToList function. The push method modifies the original array. If you wanted to return the array from the function rather than the length of the array, ...
Array 对象的属性 FF: Firefox, N: Netscape, IE: Internet Explorer new Array() new Array(len) new Array([item0,[item1,[item2,...]]] 使用数组对象的方法: var objArray=new Array(); objArray.concact([item1[,item2[,...]]]---将参数列表连接到objArray的后面形成一个新的数组并返回,...
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method * needle is the item you are searching for * this is a special variable that refers to "this" instance of an Array. * returns true if needle is in the array, and false otherwise */Array.prototype.contains=function(needle){for(iinthis){if(this[i]==needle)returntrue;}returnfalse...
select arrayContainsPropertyValue('[{"name":"Fred", "beers":2}, {"name":"Scott", "beers":3}, {"name":"Lenka", "beers":1}]', 'Lenka', 'name') as arrayPropContains; This example is checking if the array contains an object where thenameproperty of an object is “Lenka”. ...
Array.contains 函数 确定指定对象是否是Array对象中的元素。此函数是静态的,可在不创建对象实例的情况下调用。 var itemExists = Array.contains(array, item); 返回值 如果指定对象是数组中的元素,则为true;否则为false。 备注 使用contains函数确定指定对象是否是Array对象中的元素。