JavaScript Boolean valueOf() Method

Below is the example of Boolean valueOf() method.

Example:

<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()); 

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:

<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> 

Output:

true

Program 2:

<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> 

Output:

true

Program 3:

<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> 

Output:

true

Program 4:

<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> 

Output:

true

Program 5:

<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> 

Output:

true

Program 6:

<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> 

Output:

false

Program 7:

<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> 

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.

<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 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.

<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()); 

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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