String Function - indexOf

how to find the position of a character or word in a string using javascript?


Object: String
Method or Function: indexOf(string)
Description: This method takes a character or string as an argument. Searches the given string in the main string and returns the index or starting (first occurrence) position of the string. Returns -1 if the search string is not present in the main string.


<script language=javascript>
var ss = "a string index of test ";
var result = ss.indexOf("ri");


In the above example,
  • the main string is stored in a variable ss.
  • the method takes a string "ri" as argument.
  • this function searches in main string (ss) for the search string (ri).
  • the first occurrence of the search word is found at the position 4 and is returned as the result.

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