Skip to content
Related Articles

Related Articles

JavaScript Boolean valueOf() Method

Improve Article
Save Article
  • Last Updated : 27 Oct, 2022
Improve Article
Save Article

The boolean.valueOf() method is used to return a boolean value either “true” or “false” depending upon the value of the specified boolean object.

Syntax: 

boolean.valueOf()

Parameter: This method does not accept any parameter.

Return value: It returns a boolean value either “true” or “false” depending upon the value of the specified boolean object.

Below is an example of the Boolean valueOf() method. 

Example: 

javascript




<script>
  // Here Boolean object obj
  // is created for the value 27
  var obj = new Boolean(27);
 
  // Here boolean.valueOf() function is
  // used for the created object obj.
  console.log(obj.valueOf());
</script>


Output: 

true

Program 1: 

javascript




<script>
  // Here Boolean object obj is created
  // for the value true.
  var obj = new Boolean(true);
 
  // Here boolean.valueOf() function is
  // used for the created object obj.
 console.log(obj.valueOf());
</script>


Output: 

true

Program 2: 

javascript




<script>
  // Here Boolean object obj is
  // created for the value 1.
  var obj = new Boolean(1);
 
  // Here boolean.valueOf() function
  // is used for the created object obj.
  console.log(obj.valueOf());
</script>


Output: 

true

Program 3: 

javascript




<script>
  // Here Boolean object obj is
  // created for the value -1.
  var obj = new Boolean(-1);
 
  // Here boolean.valueOf() function
  // is used for the created object obj.
 console.log(obj.valueOf());
</script>


Output: 

true

Program 4: 

javascript




<script>
  // Here Boolean object obj is
  // created for the value 1.2
  var obj = new Boolean(1.2);
 
  // Here boolean.valueOf() function
  // is used for the created object obj.
  console.log(obj.valueOf());
</script>


Output: 

true

Program 5: 

javascript




<script>
  // Here Boolean object obj is
  // created for the value as string "gfg"
  var obj = new Boolean("gfg");
 
  // Here boolean.valueOf() function is
  // used for the created object obj.
  console.log(obj.valueOf());
</script>


Output: 

true

Program 6: 

javascript




<script>
  // Here Boolean object obj is created for the value false.
  var obj = new Boolean(false);
 
  // Here boolean.valueOf() function is
  // used for the created object obj.
  console.log(obj.valueOf());
</script>


Output: 

false

Program 7: 

javascript




<script>
  // Here Boolean object obj is created
  // for the value zero (0)
  var obj = new Boolean(0);
 
  // Here boolean.valueOf() function is
  // used for the created object obj.
  console.log(obj.valueOf());
</script>


Output: 

false

Program 8: Here the value as geeksforgeeks gives an error because this value is not defined only true and false has been predefined.

javascript




<script>
  // Here Boolean object obj is created
  // for the value geeksforgeeks.
  var obj = new Boolean(geeksforgeeks);
 
  // Here boolean.valueOf() function is
  // used for the created object obj.
  console.log(obj.valueOf());
</script>


Output: 

Error: geeksforgeeks is not defined

Program 9: Here complex numbers can not be taken as the parameter only integer values and string can be taken as the parameter that is why it returns an error. 

javascript




<script>
  // Here Boolean object obj is created
  // for the value such as complex number 1+2i
  var obj = new Boolean(1 + 2i);
 
  // Here boolean.valueOf() function is
  // used for the created object obj.
  console.log(obj.valueOf());
</script>


Output: 

Error: Invalid or unexpected token

Supported Browsers: The browsers supported by JavaScript Boolean valueOf() Method are listed below:

  • Google Chrome 1 and above
  • Internet Explorer 4 and above
  • Mozilla Firefox 1 and above
  • Safari 1 and above
  • Opera 4 and above

My Personal Notes arrow_drop_up
Related Articles

Start Your Coding Journey Now!