CoffeeScript Math - cos()


The cos() method accepts a number and returns its cosine value which is between -1 and 1.


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

Math.cos( x )


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

value = Math.cos 90 
console.log "The cosine value of 90 is : " + value 
value = Math.cos -1
console.log "The cosine value of -1 is : " + value 
value = Math.cos 2*Math.PI
console.log "The cosine value of 2*Math.PI is : " + value

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

c:\> coffee -c

On compiling, it gives you the following JavaScript.

// Generated by CoffeeScript 1.10.0
(function() {
  var value;

  value = Math.cos(90);

  console.log("The cosine value of 90 is : " + value);

  value = Math.cos(-1);

  console.log("The cosine value of -1 is : " + value);

  value = Math.cos(2 * Math.PI);

  console.log("The cosine value of 2*Math.PI is : " + value);


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

c:\> coffee

On executing, the CoffeeScript file produces the following output.

The cosine value of -1 is : -0.4480736161291702
The cosine value of null is : 0.5403023058681398
The cosine value of 20 is : 1