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JavaScript Boolean valueOf() Method

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  • Last Updated : 09 Jan, 2023
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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.

Example 1: Below is an example of the Boolean valueOf() method. 

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

Example 2: Here the Boolean object is created with the value true and used with the boolean.valueOf() method.

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

Example 3: Here the Boolean object is created with the value 1 and used with the boolean.valueOf() method.

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

Example 4: Here the Boolean object is created with the value -1 and used with the boolean.valueOf() method.

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

Example 5: Here the Boolean object is created with the value 1.2 and used with the boolean.valueOf() method.

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

Example 6: Here the Boolean object is created with the string value gfg and used with the boolean.valueOf() method.

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

Example 7: Here the Boolean object is created with the value false and used with the boolean.valueOf() method.

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

Example 8: Here the Boolean object is created with the value 0 and used with the boolean.valueOf() method.

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 9: Here the value as geeksforgeeks gives an error because this value is not defined only true and false have 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 10: Here complex numbers can not be taken as the parameter only integer values and strings can be taken as the parameter which 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

We have a complete list of Javascript Boolean methods, to check those please go through the Javascript Boolean Complete Reference article.

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

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