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This method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex or -1 if the value is not found.

Syntax

string.indexOf(searchValue[, fromIndex])

Argument Details

• searchValue − A string representing the value to search for.
• fromIndex − The location within the calling string to start the search from. It can be any integer between 0 and the length of the string. The default value is 0.

Return Value

Returns the index of the found occurrence, otherwise -1 if not found.

Example

var str1 = new String( "This is string one" ); 
 
var index = str1.indexOf( "string" ); 
console.log("indexOf found String :" + index );   

var index = str1.indexOf( "one" ); 
console.log("indexOf found String :" + index );

On compiling, it will generate the same code in JavaScript.

Its output is as follows −

indexOf found String :8 
 
indexOf found String :15

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