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This article will explain in detail what is the use of Array.includes (). The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

The includes () method determines whether the array contains a value in its entry and returns true or false

Arr .clients (valueToFind [, fromIndex])

FromIndex optional location in this array to start the search valueToFind.

The first character to search for when fromIndex is found to be a positive value fromIndex or a negative value (the number of characters that use absolute values as a character to search at the end of the array).

Arr.length + fromIndex

FromIndex

FromIndex defaults to 0.

Return value

A Boolean is true if the value valueToFind is found in the array (or part of the array is indicated by the index fromIndex, if specified).

FromIndex is greater than or equal to array length

If fromIndex is greater than or equal to the length of the array, false returns. The array is not searched.

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