note

push、pop、unshift、shiftメソッドって何？JavaScriptの配列を操作する ...

Web開発を学んでいくと、よく登場するのが「配列（Array）」です。 配列は、複数のデータをひとまとめにして扱うための仕組みです。 たとえば「1、2、3」という3つの数値を1つの変数で管理したいとき、配列を使うことで [1, 2, 3] のようにまとめて扱えます。
findnerd.com

Javascript Array Methods: Unshift(), Shift(), Push(), And Pop()

push() and pop(), these two methods append elements to an array and remove an element from the an array respectively. Both of these methods work at the end of the array, where the index is largest.
findnerd.com

unshift() method of the JavaScript Array

Example of Array unshift() method : Here I will show you how to add new element at the beginning of the array. <!DOCTYPE html> <html> <body> <p>To add new element at ...
GitHub

Manipulate Arrays With unshift.md

Not only can you shift elements off of the beginning of an array, you can also unshift elements to the beginning of an array i.e. add elements in front of the array.
GitHub

shift_and_unshift_method.html

//The shift() method removes the first element from an array and returns that removed element. //This method changes the length of the array. //The unshift() method adds one or more elements to the ...