How to convert value to Javascript string

Description

There are two ways to convert a value into a string. 

• toString() method from each value
• String() cast function

toString()

toString() method returns the string equivalent of the value.

The toString() method is available on values that are numbers, Booleans, objects, and strings. If a value is null or undefined, this method is not available.

var age = 11; 
var aString = age.toString();         //the string "11" 
var found = true; 
var anotherString = found.toString(); //the string "true" 
//  w  w w . jav a  2 s .co  m
console.log(anotherString);

The code above generates the following result.

Number toString()

toString() on a number value accepts a single argument: the radix.

By passing in a radix, toString() can output the value in binary, octal, hexadecimal, or any other valid base:

var num = 10;
console.log(num.toString());       //"10"
console.log(num.toString(2));      //"1010"
console.log(num.toString(8));      //"12"
console.log(num.toString(10));     //"10"
console.log(num.toString(16));     //"a"
/*from  w w w  . j  av  a 2  s . com*/

The default is the same as providing a radix of 10.

The code above generates the following result.

String()

String() casting function is useful for null or undefined value. The String() function follows these rules:

Example:Four values are converted into strings: a number, a Boolean, null, and undefined. The result for the number and the Boolean are the same as if toString() were called.

var value1 = 10;
var value2 = true;
var value3 = null;
var value4;
/*from  ww  w .  ja v  a 2 s .  c o m*/
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.

You can convert a value to a string by adding an empty string ("") to that value using the plus operator.

The code above generates the following result.