What are the differences between shift and unshift in js

This article mainly talks about "what are the differences between shift and unshift in js". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what are the differences between shift and unshift in js?"

1. Add unshift can accept = = add multiple items, but delete only one item by shift.

Arrays shift and unshfit provide a similar method of queue operation (First-In-First-Out first-in, first-out), adding or removing from the header.

2. Shift and unshfit will modify the original array, shift will return the item = = delete = =, and unshift will return the length of the array after = = add = =.

Example

/ / unshift is to add all var colors = new Array () to the header; / / create an array var count = colors.unshift ('red',' green'); / / ['red',' green'] so far, I believe you have a deeper understanding of "what is the difference between shift and unshift in js". You might as well do it in practice! Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!