JavaScript | Math.log2() function

The Math.log10() 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 paratameter 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:
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  <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>

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  Output:

  9.965784284662087
  3.584962500721156
  4.700439718141092
  2.321928094887362
  

• Example 2:
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  <script>   // Taken parameter from 1 to 19 incremented by 3.   for (i = 1; i < 20; i += 3) {       document.write(Math.log2(i) + "<br>");   } </script>

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  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:
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  <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>

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  Output:

  NaN
  

• Example 2: This function gives error when its parameter taken as complex number because it accept only integer value as the parameter.
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  <script>   // Parametes can never be a complex number because   // it accept only integer value as the parameter.   documnet.write(Math.log2(1 + 2i)); </script>

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  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:

3.807354922057604

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

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

Kanchan_Ray

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