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This article is about the usefulness of Array.indexOf (). The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Arr .indexOf (searchElement [, fromIndex])

The element that searchElement wants to locate in the array.

FromIndex optional index to start the search. If the index is greater than or equal to the length of the array,-1 is returned, which means that the array will not be searched. If the index value provided is negative, it is treated as an offset from the end of the array. Note: if the index provided is negative, the array is still searched from front to back. If the index provided is 0, the entire array is searched. The default value is 0 (search the entire array).

Return value

The first index of the element in the array;-1 (if it cannot be found).

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