Array.prototype.lastIndexOf

Returns the index of the last occurrence of a specified value in an array, or -1 if it is not present.

Syntax

lastIndexOf(value, fromIndex?);

Parameters

• value

  The value to locate in the array.

• fromIndex optional

  The array index at which to begin searching backward. If fromIndex is omitted, the search starts at the last index in the array.

Return value

An index or -1 if the element was not found.

Example

["tea", "coffee", "coffee", "coffee", "juice"].lastIndexOf("coffee")

3

// compare to indexOf:
["tea", "coffee", "coffee", "coffee", "juice"].indexOf("coffee")

1

See also

• indexOf
• findIndex
• find