JavaScript - Math log Method

Description

This method returns the natural logarithm (base E) of a number. If the value of number is negative, the return value is always NaN.

Syntax

Its syntax is as follows −

Math.log( x ) ;

Parameter Details

x − A numbers.

Return Value

Returns the natural logarithm (base E) of a number.

Example

Try the following example program.

Live Demo

<html>   
   <head>
      <title>JavaScript Math log() Method</title>
   </head>   
   <body>      
      <script type = "text/javascript">
         var value = Math.log(10);
         document.write("First Test Value : " + value ); 
         
         var value = Math.log(0);
         document.write("<br />Second Test Value : " + value ); 
         
         var value = Math.log(-1);
         document.write("<br />Third Test Value : " + value ); 
         
         var value = Math.log(100);
         document.write("<br />Fourth Test Value : " + value ); 
      </script>      
   </body>
</html>

Output

First Test Value : 2.302585092994046
Second Test Value : -Infinity
Third Test Value : NaN
Fourth Test Value : 4.605170185988092

javascript_math_object.htm