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`array.lastIndexOf()`

Get the index of the last Array element that matches a provided value.

Signature

lastIndexOf(element: A) => Number | Null

lastIndexOf(element: A, end: Number) => Number | Null

Description

Searches, right-to-left, for the first element that matches a provided value and returns the index of the element if a match is found.

If an optional end index is provided, the method searches right-to-left starting at the end index and returns the first matching index (inclusive).

Parameters

Parameter	Type	Required	Description
element	Generic	true	Value to search for in the Array elements.
start	Number		Starting index (inclusive) of the right-to-left search. Must be an Int.

Parameter

Type

Required

Description

element

Generic

true

Value to search for in the Array elements.

start

Number

Starting index (inclusive) of the right-to-left search. Must be an Int.

Return value

One of:

Type	Description
Number	Index of the element that matches the provided value.
Null	Returned if a match isn’t found.

Type

Description

Number

Index of the element that matches the provided value.

Null

Returned if a match isn’t found.

Examples

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

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