JavaScript | boolean.toString() function

The boolean.toString() is an inbuilt function in javascript which is used to return a string either “true” or “false” depending upon the value of the specified boolean object.
Syntax:

boolean.toString()

Parameter: This function does not accepts any single parameter.
Return Values: It returns a string either “true” or “false” depending upon the value of the specified boolean object.

Let’s see some JavaScript code on this boolean.toString() function:

• Example 1:
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  <script> // Here Boolean object obj is  // created for the value true. var obj = new Boolean(true);    // Here boolean.toString() function // is used for the created object obj. document.write(obj.toString()); </script>

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  Output:

  true

• Example 2:
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  <script> // Here Boolean object obj is  // created for the value 1. var obj = new Boolean(1);    // Here boolean.toString() function is // used for the created object obj. document.write(obj.toString()); </script>

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  Output:

  true

• Example 3:
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  <script> // Here Boolean object obj is // created for the value -1. var obj = new Boolean(-1);    // Here boolean.toString() function is // used for the created object obj. document.write(obj.toString()); </script>

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  Output:

  true

• Example 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.toString() function is // used for the created object obj. document.write(obj.toString()); </script>

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  Output:

  true

• Example 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.toString() function is  // used for the created object obj. document.write(obj.toString()); </script>

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  Output:

  true

• Example 6:
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  <script> // Here Boolean object obj is created // for the value false. var obj = new Boolean(false);    // Here boolean.toString() function is // used for the created object obj. document.write(obj.toString()); </script>

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  Output:

  false

Errors and Exceptions:

• Example 1: Here the value as geeksforgeeks gives 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.toString() function is // used for the created object obj. console.log(obj.toString()); </script>

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  Output:

  Error: geeksforgeeks is not defined

• Example 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.toString() function is  // used for the created object obj. console.log(obj.toString()); </script>

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  Output:

  Error: Invalid or unexpected token

Application:

• This function’s application is to return a string of either “true” or “false” depending upon the value of the object given.
  Let’s see JavaScript program on this application:
  Example:
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  <script> // Here Boolean object obj  // is created for the value 27 var obj = new Boolean(27);    // Here boolean.toString() function is  // used for the created object obj. document.write(obj.toString()); </script>

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  Output:

  true

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