TypeScript If Else


If Statement:

This statement is basically used to check certain conditions or sometimes we reqiure to execute certain statement when specified condition true.

Syntax

if (condition)
   //code that will run if the condition is true

Example

var msg:string;
if (age < 20)
   this.msg = "Invalid person for test";
Live Demo

If..Else Statement:

When specified condition failed, else statement will be executed.

Syntax

if (condition)
   //code that will run if the condition is true
else
  //code that will run if the condition is false

Example

CheckAge(age:number) : string
{ 
	if (age < 20)   
		this.msg = 'Invalid person for test';
	else
		this.msg = 'Valid person for test';
  
	return this.msg;
}
Live Demo

If..Else If Statement

When there are situations when we need to test several conditions thenuse else if condition.

Syntax

if (condition1)
   //code that will run if the condition1 is true
else if(condition2)
  //code that will run if the condition2 is true
else if(condition3)
  //code that will run if the condition3 is true
else
  //code that will run if the all contitions fails

Example

CheckNumber(num:number) : string
{ 
   if (num > 0)
	  msg = "Positive number";
   else if(num < 0)
	  msg = "Negetive number";
   else
	  msg = "Not a number";
  
	return msg;
}

Live Demo


See Also

AngularJS Built-in Filters
AngularJS Built-in Directives
AngularJS Expression
AngularJS Built-in Events
AngularJS Scope Methods
AngularJS Built-in Services
AngularJS Controller Inheritance
AngularJS Custom Directives



 
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