String.prototype.lastIndexOf

Returns the index of the last occurrence of a substring in the string.

Syntax

lastIndexOf(substring, startIndex?)

Parameters

• substring

  The substring to search for.

• startIndex optional

  The index at which to begin searching. If omitted, the search begins at the end of the string.

Return value

The index of the last occurrence of the specified substring, or -1 if not found.

Examples

"banana".indexOf("na")

4

"banana".indexOf("no")

-1