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JavaScript | Math.log2() function

  • Last Updated : 19 Sep, 2021
Geek Week

The Math.log2() is an inbuilt function in JavaScript which give the value of base 2 logarithms of any number. 
Syntax: 

Math.log2(p)

Parameters: This function accepts a single parameter p which is any number whose base 2 logarithms is to be calculated.

Returns: It returns the value of base 2 logarithms of any number.

Examples:  

Input : Math.log2(5)

Output: 2.321928094887362

Explanation: 
Here value of bese 2 logarithms of number 5 is 2.321928094887362 as shown output.  



Input : Math.log2(10)
Output:3.321928094887362

Let’s see some JavaScript code on this function: 

  • Example 1:

Javascript




<script>
  // Different numbers are being taken
  // as the parameter of the function.
  document.write(Math.log2(1000) + "<br>");
  document.write(Math.log2(12) + "<br>");
  document.write(Math.log2(26) + "<br>");
  document.write(Math.log2(5));
</script>                   

Output: 

9.965784284662087
3.584962500721156
4.700439718141092
2.321928094887362
  • Example 2:

Javascript




<script>
  // Taken parameter from 1 to 19 incremented by 3.
  for (i = 1; i < 20; i += 3) {
      document.write(Math.log2(i) + "<br>");
  }
</script>

Output: 

0
2
2.807354922057604
3.321928094887362
3.700439718141092
4
4.247927513443585

Errors and exceptions: Parameters for this function should always be a number otherwise it returns NaN i.e, not a number when its parameter is taken as a string.  

  • Example 1:

Javascript




<script>
  // Parameters for this function should always be a
  // number otherwise it return NaN i.e, not a number
  // when its parameter taken as string.
  document.write(Math.log2("gfg"));
</script>

Output: 

NaN
  • Example 2: This function gives error when its parameter taken as complex number because it accept only integer value as the parameter.

Javascript




<script>
  // Parametes can never be a complex number because
  // it accept only integer value as the parameter.
  document.write(Math.log2(1 + 2i));
</script>

Output: 

Error: Invalid or unexpected token

Application: Whenever we need the value of base 2 logarithms of any number that time we take the help of this function.Its value needed many times in mathematics problem. 
Let’s see JavaScript code for this application: 

  • Example 1:

Javascript




<script>
  // taking parameter as number 14 and
  //calculated in the form of function.
  function value_of_base_2_logarithms_of_any_number()
  {
    return Math.log2(14);
  }
  document.write(value_of_base_2_logarithms_of_any_number());
</script>                   

Output: 

3.807354922057604

Supported Browsers: The browsers supported by JavaScript Math.log2() function are listed below:  

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari

 

Hey geek! The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. But before you tackle the big projects, we suggest you start by learning the basics. Kickstart your web development journey by learning JS concepts with our JavaScript Course. Now at it’s lowest price ever!




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