Function strIndexOf

The strIndexOf() method, given two arguments: the string and a substring to search for, searches the entire calling string, and returns the index of the first occurrence of the specified substring. Given a thrid argument: a number, the method returns the first occurrence of the specified substring at an index greater than or equal to the specified number.

Example

strIndexOf('hello world', '') // returns 0
strIndexOf('hello world', '', 0) // returns 0
strIndexOf('hello world', '', 3) // returns 3
strIndexOf('hello world', '', 8) // returns 8

// However, if the thrid argument is greater than the length of the string
strIndexOf('hello world', '', 11) // returns 11
strIndexOf('hello world', '', 13) // returns 11
strIndexOf('hello world', '', 22) // returns 11

strIndexOf('Blue Whale', 'Blue')      // returns  0
strIndexOf('Blue Whale', 'Blute')     // returns -1
strIndexOf('Blue Whale', 'Whale', 0)  // returns  5
strIndexOf('Blue Whale', 'Whale', 5)  // returns  5
strIndexOf('Blue Whale', 'Whale', 7)  // returns -1
strIndexOf('Blue Whale', '')          // returns  0
strIndexOf('Blue Whale', '', 9)       // returns  9
strIndexOf('Blue Whale', '', 10)      // returns 10
strIndexOf('Blue Whale', '', 11)      // returns 10
  • strIndexOf(value, searchString, position?): number

  • Parameters

    • value: string

      The value to be checked for the seeach string

    • searchString: string

      The substring to search for in the value

    • Optionalposition: number

      The starting position to search from

    Returns number

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