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lastIndexOf

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2023-12-01

Finds the index of the last occurrence of the given substring within this sequence, starting from the specified index (or the end of the sequence) and working backwards.

Signature

StringLikeSequence.lastIndexOf = function(substring, startIndex) { /*...*/ }

StringLikeSequence.lastIndexOf = function lastIndexOf(substring, startIndex) {
  return this.toString().lastIndexOf(substring, startIndex);
}

Name	Type(s)	Description
substring	string	The substring to search for.
startIndex	number?	The index from which to start the search.
returns	number	The last index where the given substring is found, or -1 if it isn't in the sequence.

Examples

Lazy('canal').lastIndexOf('a')    // => 3
Lazy('canal').lastIndexOf('a', 2) // => 1
Lazy('canal').lastIndexOf('ana')  // => 1
Lazy('canal').lastIndexOf('andy') // => -1
Lazy('canal').lastIndexOf('x')    // => -1

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