function getLastElementChild(obj){ if(obj.lastElementChild != undefined){ return obj.lastElementChild; }else{ var nodeLast = obj.lastChild; while(nodeLast && nodeLast.nodeType != 1){ nodeLast = nodeLast.previousSibling; } return nodeLast; } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10...
This article discusses the preferred way to retrieve the last element of an Array in JavaScript. Tip 7 in this Useful JavaScript Hacks Article proposes the following method to get the last item in an array. syntax1.js var array = [1,2,3,4,5,6];console.log(array.slice(-1)[0]); /...
Write a JavaScript function to get the last element of an array. Passing the parameter 'n' will return the last 'n' elements of the array. Test Data: console.log(last([7, 9, 0, -2])); console.log(last([7, 9, 0, -2],3)); console.log(last([7, 9, 0, -2],6)); Expec...
Global、Math、RegExp、Regular、Expression等一些特殊对象之外,其他所有的JavaScript内置对象都具备 constructor属性。例如:Array、Boolean、Date、Function、Number\Object、String等。 以下代码中的[native code],表示这是JavaScript的底层内部代码实现,无法显示代码细节。 //字符串:String()varstr = "张三"; alert(str....
const newArray = array.filter(callback(element[, index[, array]])[, thisArg]) callback:用来测试数组的每个元素的回调函数,返回true表示该元素通过测试,保留该元素,false则不保留。它接受以下三个参数: element:数组中当前正在处理的元素。 index:可选,正在处理的元素在数组中的索引。
functionmultiplyArrayElement(num) {returnnum * 10; }functionmyFunction() { console.log(numbers.map(multiplyArrayElement)); } 结果: 新数组:650,440,120,40 2.16pop() 定义和用法 pop() 方法用于删除数组的最后一个元素并返回删除的元素。 注意:此方法改变数组的长度!
pop_back(); // Remove the last element //假设要删除 data 中的第二个元素 std::swap(std::begin(data)+1,std::end(data)-1); data.pop_back(); // Interchange 2nd element with the last data.pop_back(); // Remove the last element //如果要去掉容器中多余的容量,例如不再向容器中添加...
defined. To get the last object from this array, the variablelastObjectis assigned the value ofmyArray[myArray.length - 1]. ThelastObjectwill hold the last element of the array. The code then renders a React component that displays the array elements and the name of the last object in ...
find()Returns the value of the first element in an array that pass a test findIndex()Returns the index of the first element in an array that pass a test findLast()Returns the value of the last element in an array that pass a test ...
JavaScript Array pop() Thepop()method removes the last element from an array: Example constfruits = ["Banana","Orange","Apple","Mango"]; fruits.pop(); Try it Yourself » Thepop()method returns the value that was "popped out": ...