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JavaScript | Math.clz32() function

  • Last Updated : 02 Feb, 2022

Math.clz32() is an inbuilt function in JavaScript that 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 a 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 is a total of 28 zero bits which are leading 1010 i.e, 4 bits 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:

Javascript




<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>                   

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.

Javascript




<script>
  // complex number can not be converted into
  // 32-bit binary representation.
  document.write(Math.clz32(1+2i));
</script>

Output: 

Error: Invalid or unexpected token
  • Example 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.

Javascript




<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>

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:

Javascript




<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>

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 38 and above
  • Firefox 12 and above
  • Opera 25 and above
  • Safari 7 and above

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