Скачать с ютуб JavaScript array push and pop methods в хорошем качестве

JavaScript array push and pop methods

Link for all dot net and sql server video tutorial playlists    / kudvenkat   Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspo... Healthy diet is very important both for the body and mind. If you like Aarvi Kitchen recipes, please support by sharing, subscribing and liking our YouTube channel. Hope you can help.    / @aarvikitchen5572   In this video we will discuss push() and pop() methods in JavaScript. Along the way we will also discuss shift() and unshift() methods. Let us understand these methods with examples. In the example below, we are populating myArray using a for loop and the array index. Subsequently we are using another for loop to retrieve the elements from the array. Finally we are displaying the length of the array using JavaScript alert. var myArray = []; for (var i = 0; i [= 5; i++) { myArray[i] = i * 2; } for (var i = 0; i [= 5; i++) { document.write(myArray[i] + "[br/]"); } alert(myArray.length); Please note : Retrieving array elements using the array index, will not change the length of the array. JavaScript push() method This method adds new items to the end of the array. This method also changes the length of the array. JavaScript pop() method This method removes the last element of an array, and returns that element. This method changes the length of an array. Example : In the exampe below, we are using push() method to populate the array and pop() method to retrieve elements from the array. Notice that push() and pop() methods change the length property of the array. var myArray = []; for (var i = 0; i [= 5; i++) { myArray.push(i * 2); } alert(myArray.length); for (var i = 0; i [= 5; i++) { document.write(myArray.pop() + "[br/]"); } alert(myArray.length); JavaScript unshift() Method push() method adds new items to the end of the array. To add new items to the beginning of an array, then use unshift() method. Just like push() method, unshift() method also changes the length of an array Example : var myArray = [2,3]; // Adds element 4 after element 3 myArray.push(4); // Adds element 1 before element 2 myArray.unshift(1); document.write("Array elements = " + myArray + "[br/]"); document.write("Array Length = " + myArray.length); JavaScript shift() Method pop() method removes the last element of an array, and returns that element. shift() method removes the first item of an array, and returns that item. Just like pop() method, shift() method also changes the length of an array. Example : var myArray = [1, 2, 3, 4, 5]; // removes the last element i.e 5 from the array var lastElement = myArray.pop(); document.write("Last element = " + lastElement + "[br/]"); // removes the first element i.e 1 from the array var firstElement = myArray.shift(); document.write("First element = " + firstElement + "[br/][br/]"); document.write("Array elements = " + myArray + "[br/]"); document.write("Array Length = " + myArray.length);