Javascript String Converting to a String using String()

Introduction

To deal with null or undefined, use the String() function to convert data to String.

String() function always returns a string regardless of the value type.

The String() function follows these rules:

  • If the value has a toString() method, it is called with no arguments and the result is returned.
  • If the value is null, "null" is returned.
  • If the value is undefined, "undefined" is returned. 
let value1 = 10; 
let value2 = true; 
let value3 = null; 
let value4; //from  w  w w.  j  a va  2  s  . c om
                      
console.log(String(value1));   // "10" 
console.log(String(value2));   // "true" 
console.log(String(value3));   // "null" 
console.log(String(value4));   // "undefined"

Because toString() isn't available on "null" and "undefined", the String() method simply returns literal text for those values.




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