Question

Finds the index of the first occurrence of the given substring within this sequence, starting from the specified index (or the beginning of the sequence).

Signature

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

StringLikeSequence.indexOf = function indexOf(substring, startIndex) {
  return this.toString().indexOf(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 first index where the given substring is found, or -1 if it isn't in the sequence.

Examples

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