How to determine whether there is a specified value in javascript array

This article introduces the knowledge of "how to determine whether there is a specified value in javascript array". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Description

1. If an element meets the condition, some returns true and the loop is interrupted.

Returns false if none of the elements meet the criteria.

2. In contrast to some, every returns false if the beneficial element does not meet the condition, and the loop is interrupted.

All elements are eligible and true is returned.

Both are used to determine array conditions and both return a Boolean value. Can be interrupted.

Example

Const list = [{name: 'header navigation', backward: false}, {name: 'carousel', backward: true}, {name: 'footer', backward: false},]; const someBackward = list.some (item = > item.backward); / / someBackward: true const everyNewest = list.every (item = >! item.backward) / / everyNewest: false, "how to determine whether a specified value exists in the javascript array" is introduced here. Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!