Source @ github

String.indexOf

indexOf — Finds the position of the first occurrence of a string within a string.

Description

String.indexOf(string string, [integer offset])

Parameters

Name Description Type Default Optional
string string No
offset integer Yes

Return values

number primitive.

Examples

Example #1 – indexOf example
var txt = 'Hello World';
console.log(txt.indexOf('o'));  // Will return 4.
console.log(txt.indexOf('o', 5));  // Will return 7.
console.log(txt.indexOf('a'));  // Will return -1.

External references