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JavaScript Boolean valueOf() Method
  • Last Updated : 27 Jun, 2020

Below is the example of Boolean valueOf() method.

  • Example:
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    <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.
      document.write(obj.valueOf());

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  • Output:
    true

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.



More codes for the above method are as follows:

  • Program 1:
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    <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.
      document.write(obj.valueOf());
    </script>

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    Output:

    true
  • Program 2:
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    <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.
      document.write(obj.valueOf());
    </script>

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    Output:

    true
  • Program 3:
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    <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.
      document.write(obj.valueOf());
    </script>

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    Output:

    true
  • Program 4:
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    <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.
      document.write(obj.valueOf());
    </script>

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    Output:

    true
  • Program 5:
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    <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.
      document.write(obj.valueOf());
    </script>

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    Output:

    true
  • Program 6:
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    <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.
      document.write(obj.valueOf());
    </script>

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    Output:

    false
  • Program 7:
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    <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.
      document.write(obj.valueOf());
    </script>

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    Output:

    false
    • Errors and Exceptions: Check the console for this Programs.

    • Program 1: Here the value as geeksforgeeks gives an error because this value is not defined only true and false has been predefined.
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      <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>

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      Output:

      Error: geeksforgeeks is not defined
    • Program 2: Here complex number can not be taken as the parameter only integer values and string can be taken as the parameter that is why it returns error.
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      <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());

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      Output:

      Error: Invalid or unexpected token

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

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