JavaScript Math log( ) Method

Below is the example of the Math log() Method.

• Example:

  <script type="text/javascript">
       document.write("When zero is  passed as a parameter: "
                       + Math.log(0));
  </script>
• Output:

  When zero is  passed as a parameter: -Infinity

The Math.log() method used to return the natural logarithm (base e) of a number. The JavaScript Math.log() method is equivalent to ln(x) in mathematics. If the value of x is negative, then math.log() method return NaN.

The log() is a static method of Math, therefore, it is always used as Math.log(), rather than as a method of a Math object created.

Syntax:

Math.log(value)

Parameters: This method accepts a single parameter as mentioned above and described below:

• value: This parameter holds a number whose natural logarithm you want to find.

Return value: The Math.log() method returns the natural logarithm given number.

More codes for the above method are as follows:

Program 1: When “-1” is passed as a parameter.

<script type="text/javascript">
         document.write("Result: " + Math.log(-1));
</script>

Output:

Output : NaN

Program 12: When “10” is passed as a parameter.

<script type="text/javascript">
         document.write("Result : " + Math.log(10));
</script>

Output:

Result : 2.302585092994046

Program 3: Calculating Math.log() with a different base. For finding the logarithm of 8 with base 2,execute the math.log() method in the following way:

<script type="text/javascript">
         document.write("Result : " + Math.log(8)/Math.log(2));
</script>

Output:

Output : 3

Supported Browsers:

• Google Chrome 1 and above
• Internet Explorer 3 and above
• Firefox 1 and above
• Opera 3 and above
• Safari 1 and above