JavaScript | Math.clz32() function

Math.clz32() is an inbuilt function in JavaScript which stands for “Count Leading Zeroes 32”. This function is used for getting the number of leading zero bits present in 32-bit representation of a number.
Syntax:

Math.clz32(p)

Parameter: this function accepts a single parameter p, which is a number for which the number of leading zero bits present in its 32-bit representation is going to find out.

Returns: It returns the number of leading zero bits present in 32-bit representation of the number.

Examples:

Input  : Math.clz32(10)
Output : 28

Explanation:
Here the number 10 can be represented in 32-bit as below shown below-

00000000000000000000000000001010

From the above representation, we see that there are total 28 zero bits which are leading 1010 i.e, 4 bit of decimal number 10. That is why here output becomes 28 as leading zero bits are 28.

Input  : Math.clz32(64)
Output :25 

Let’s see JavaScript code on Math.clz32() function.

• Example 1:
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  <script>   // Here different number is being taken as parameter for   // Math.clz32() function.   document.write(Math.clz32(1) + "<br>");   document.write(Math.clz32(8) + "<br>");   document.write(Math.clz32(32) + "<br>");   document.write(Math.clz32(64) + "<br>");   document.write(Math.clz32(772) + "<br>"); </script>

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  Output:

  31
  28
  26
  25
  22
  

• Example 2: Errors and Exceptions, it is an error case because a complex number cannot be converted into 32-bit binary representation only integers value can be converted.
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  <script>   // complex number can not be converted into   // 32-bit binary representation.   document.write(Math.clz32(1+2i)); </script>

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  Output:

  Error: Invalid or unexpected token

• Eaxmple 3: It is an exceptional case that it can be considered as string parameter gives internally zero then it become possible otherwise it should return an error.
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  <script>   // Any string behave exceptionally and give leading   // 32 zero bit in its 32-bit binary representation   // still any string can not be converted into    // 32-bit binary representation.   document.write(Math.clz32("geeksforgeeks") + "<br>");   document.write(Math.clz32("gfg")); </script>

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  Output:

  32
  32

Application: Here Math.clz32() function have many applications as whenever we need to get the number of leading zero bits present in 32-bit representation of a number that time we take the help of this function in JavaScript.

• Example:
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  <script>   // Here different numbers are being taken as   // parameter from 0 to 9 for Math.clz32() function.   for (i = 0; i < 10; i++)   {        document.write(Math.clz32(i) + "<br>");    } </script>

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  Output:

  32
  31
  30
  30
  29
  29
  29
  29
  28
  28
  

Supported Browsers: The browsers supported by JavaScript Math.clz32() function are listed below:

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

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