log(lastElement); // 输出: 3 console.log(myArray); // 输出: [1, 2] 3. 使用shift()方法 与pop()方法相反,shift()方法用于删除并返回数组的第一个元素。 代码示例: javascript let myArray = [1, 2, 3]; // 使用shift()方法删除第一个元素 let firstElement = myArray.shift(); console....
elements); }, removeElement() { // 每次移除元素时 // obj.length 都会自动减少 // 返回 pop 方法的返回值,即被移除的元素 return [].pop.call(this); }, }; collection.addElements(10, 20, 30); console.log(collection.length); // 3 collection.removeElement(); console.log(collection.length...
在这个示例中,我们首先创建了一个ArrayList对象list,并使用add()方法添加了5个整数元素。然后,我们使用remove()方法删除了最后一个元素,通过传入list.size() - 1作为索引参数,即可删除最后一个元素。 使用ArrayList的方式更加简洁和灵活,尤其适用于需要频繁对数组进行修改的情况。 总结 本文介绍了两种在Java中删除数组...
clear(); // Remove all elements 所以容量还是 100。 std::vector<int> data(100, 99); // Contains 100 elements initialized to 99 data.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(); /...
JavaScript includes mutation methods that modify the array:array.pop - Remove the last element from the array. array.push - Add one or more elements to the end of the array. array.reverse - Reverse the order of the elements of the array. array.shift - Remove the first element from the ...
functionlog(element, index, array) { console.log('[' + index + '] = ' +element); } [2, 5, 9].forEach(log);//[0] = 2//[1] = 5//[2] = 9 上面代码中,forEach遍历数组不是为了得到返回值,而是为了在屏幕输出内容,所以应该使用forEach方法,而不是map方法,虽然后者也可以实现同样目的...
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": ...
When you work with arrays, it is easy to remove elements and add new elements. This is what popping and pushing is: Popping itemsoutof an array, or pushing itemsintoan array. Popping Thepop()method removes the last element from an array: ...
4. Last Elements of Array 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)); ...
document.getElementById("myNewArray").innerHTML="The new array is: "+myArr; } Remove Array Element <pid="myNewArray"> Two elements are[21, 3]to delete from the given array using javascript. When you click the button above, it will give you the output of the new array without the...