JavaScript - Math asin Method


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Description

This method returns the arcsine in radians of a number. The asin method returns a numeric value between -pi/2 and pi/2 radians for x between -1 and 1. If the value of number is outside this range, it returns NaN.

Syntax

Its syntax is as follows −

Math.asin( x ) ;

Parameter Details

x − A number.

Return Value

Returns the arcsine in radians of a number.

Example

Try the following example program.

<html>
   
   <head>
      <title>JavaScript Math asin() Method</title>
   </head>
   
   <body>
      
      <script type="text/javascript">
         var value = Math.asin(-1);
         document.write("First Test Value : " + value );
         
         var value = Math.asin(null);
         document.write("<br />Second Test Value : " + value ); 
         
         var value = Math.asin(30);
         document.write("<br />Third Test Value : " + value ); 
         
         var value = Math.asin("string");
         document.write("<br />Fourth Test Value : " + value ); 
      </script>
      
   </body>
</html>

Output

First Test Value : -1.5707963267948966
Second Test Value : 0
Third Test Value : NaN
Fourth Test Value : NaN 

javascript_math_object.htm

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