`array.lastIndexOf()`

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

Signature

lastIndexOf(value: Any) => Number | Null

lastIndexOf(value: Any, index: Number) => Number | Null

The lastIndexOf() method returns the Array index of the element that matches value.

Parameter	Type	Required	Description
value	Any	Yes	Value to search for in the Array.
index	Number		Array index to start right-to-left search for matching value, inclusive.

Parameter

Type

Required

Description

value

Yes

Value to search for in the Array.

index

Array index to start right-to-left search for matching value, inclusive.

Type Description

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

Index of matching element or null if a match isn’t found.

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

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