Javascript String Object

The String type is the object representation for strings and is created using the String constructor as follows:

var stringObject = new String("hello world");

The methods of a String object are available on all string primitives.

valueOf(), toLocaleString(), and toString() from String type return the object's primitive string value.


var stringValue = "hello world";
console.log(stringValue.toString());
console.log(stringValue.valueOf());
console.log(stringValue.toLocaleString());

The code above generates the following result.

String Length

Each instance of String contains a property, length, which indicates the number of characters in the string. Consider the following example:


var stringValue = "hello world";
console.log(stringValue.length);   //"11"

The code above generates the following result.

Two String methods access specific characters: charAt() and charCodeAt().

They both accept zero-based position as the parameter.

The charAt() method returns the character in the given position as a single-character string.


var stringValue = "hello world";
console.log(stringValue.charAt(1));   //"e"

The code above generates the following result.

charCodeAt() returns the character code instead of the actual character.


var stringValue = "hello world";
console.log(stringValue.charCodeAt(1));   //outputs "101"

This example outputs "101", which is the character code for the lowercase "e" character.

The code above generates the following result.

You can also use bracket notation with a numeric index to access a specific character in the string.


var stringValue = "hello world";
console.log(stringValue[1]);   //"e"

The code above generates the following result.