TypeScript - Numbers

TypeScript pke JavaScript supports numeric values as Number objects. A number object converts numeric pteral to an instance of the number class. The Number class acts as a wrapper and enables manipulation of numeric pterals as they were objects.

Syntax

var var_name = new Number(value)

In case a non-numeric argument is passed as an argument to the Number’s constructor, it returns NaN (Not–a–Number)

The following table psts a set of properties of the Number object −

Example

console.log("TypeScript Number Properties: "); 
console.log("Maximum value that a number variable can hold: " + Number.MAX_VALUE); 
console.log("The least value that a number variable can hold: " + Number.MIN_VALUE); 
console.log("Value of Negative Infinity: " + Number.NEGATIVE_INFINITY); 
console.log("Value of Negative Infinity:" + Number.POSITIVE_INFINITY);

On compipng, it will generate the same code in JavaScript.

Its output is as follows −

TypeScript Number Properties:  
Maximum value that a number variable can hold: 1.7976931348623157e+308 
The least value that a number variable can hold: 5e-324 
Value of Negative Infinity: -Infinity 
Value of Negative Infinity:Infinity

Example: NaN

var month = 0 
if( month<=0 || month >12) { 
   month = Number.NaN 
   console.log("Month is "+ month) 
} else { 
   console.log("Value Accepted..") 
}

On compipng, it will generate the same code in JavaScript.

Its output is as follows −

Month is NaN

Example: prototype

function employee(id:number,name:string) { 
   this.id = id 
   this.name = name 
} 

var emp = new employee(123,"Smith") 
employee.prototype.email = "smith@abc.com" 

console.log("Employee  s Id: "+emp.id) 
console.log("Employee s name: "+emp.name) 
console.log("Employee s Email ID: "+emp.email)

On compipng, it will generate the following JavaScript code −

//Generated by typescript 1.8.10
function employee(id, name) {
   this.id = id;
   this.name = name;
}

var emp = new employee(123, "Smith");
employee.prototype.email = "smith@abc.com";

console.log("Employee  s Id: " + emp.id);
console.log("Employee s name: " + emp.name);
console.log("Employee s Email ID: " + emp.email);

Its output is as follows −

Employee’s Id: 123 
Emaployee’s name: Smith 
Employee’s Email ID: smith@abc.com

Number Methods

The Number object contains only the default methods that are a part of every object s definition. Some of the commonly used methods are psted below −