CoffeeScript Math - acos()

---

Description

The acos() method accepts an number and returns its arc-cosine in radians. It returns a numeric value between 0 and pi radians for x between -1 and 1. If the value of number is outside this range, it returns NaN.

Syntax

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

Math.acos( x )

Example

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

value = Math.acos -1
console.log "The arc cosine value of -1 is : " + value 
         
value = Math.acos null 
console.log "The arc cosine value of null is : " + value 
         
value = Math.acos 20
console.log "The arc cosine value of 20 is : " + value

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

c:\> coffee -c math_acos.coffee

On compiling, it gives you the following JavaScript.

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

  value = Math.acos(-1);

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

  value = Math.acos(null);

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

  value = Math.acos(20);

  console.log("The arc cosine value of 20 is : " + value);

}).call(this);

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

c:\> coffee math_acos.coffee

On executing, the CoffeeScript file produces the following output.

The arc cosine value of -1 is : 3.141592653589793
The arc console value of null is : 1.5707963267948966
The arc cosine value of 20 is : NaN