CoffeeScript String - indexOf()

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Description

This method accepts a sub string and returns the index of its first occurrence within the calling String object. It also accepts an optional parameter fromIndex which will be the starting point of the search. This method returns −1 if the value is not found.

Syntax

Given below is the syntax of indexOf() method of JavaScript. We can use the same method from the CoffeeScript code.

string.indexOf(searchValue[, fromIndex])

Example

The following example demonstrates the usage of indexOf() method of JavaScript in CoffeeScript code. Save this code in a file with name string_indexof.coffee

str1 = "This is string one" 
index = str1.indexOf "string" 
console.log "indexOf the given string string is :" + index 
         
index = str1.indexOf "one"
console.log "indexOf the given string one is :" + index 

Open the command prompt and compile the .coffee file as shown below.

c:\> coffee -c string_indexof.coffee

On compiling, it gives you the following JavaScript.

// Generated by CoffeeScript 1.10.0
(function() {
  var index, str1;

  str1 = "This is string one";

  index = str1.indexOf("string");

  console.log("indexOf the given string string is :" + index);

  index = str1.indexOf("one");

  console.log("indexOf the given string one is :" + index);

}).call(this); 

Now, open the command prompt again and run the CoffeeScript file as shown below.

c:\> coffee string_indexof.coffee

On executing, the CoffeeScript file produces the following output.

indexOf the given string string is :8
indexOf the given string one is :15