Javascript Object Oriented Design - Javascript Primitive Methods

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Javascript primitive types, strings, numbers, and Booleans actually have methods.

The null and undefined types have no methods.

String

Strings have many methods to work on string value.

For example:

 
var name = "Javascript is easy"; 
var lowercaseName = name.toLowerCase();     
var firstLetter = name.charAt(0);           
var middleOfName = name.substring(4, 10);   

console.log(lowercaseName);
console.log(firstLetter);
console.log(middleOfName);

The code above generates the following result.

Number

The following code calls methods from number primitive types.

       
var count = 10; 
var fixedCount = count.toFixed(2);          
var hexCount = count.toString(16);   

console.log(fixedCount);
console.log(hexCount);

The code above generates the following result.

Boolean

The following code calls toString method on boolean values

var flag = true; 
var stringFlag = flag.toString();           

console.log(stringFlag);

The code above generates the following result.

Note

Even if they have methods, primitive values are not objects.

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