`array.indexOf()`

Get the Array index of the first element that matches the given value.

Signature

indexOf(value: Any) => Number
indexOf(value: Any, index: Number ) => Number

The indexOf() method searches, left-to-right, for the element that matches value and returns the index of the element if a match is found.

If the optional index is included, the method searches right-to-left starting at index and returns the matching index, inclusive.

Parameter	Type	Required	Description
value	Any	Yes	Value to search for in the Array elements.
index	Number		Starting location of a right-to-left search.

Parameter

Type

Required

Description

value

Yes

Value to search for in the Array elements.

index

Starting location of a right-to-left search.

Type Description

Type	Description
Number	Index of element that matches value or `null` if a match isn’t found.

Index of element that matches value or null if a match isn’t found.

['a', 'b', 'c', 'b'].indexOf('c')

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