Interface in angular | #27 | What is Interface? & why, when & how by code example | Angular Tutoria

In this video, We discussed and demonstrated that what is Interface in angular, various usages of it, when & how do we use them with live code examples.

Suggested sessions:
Part-26 : Constructor Vs. ngOnInit : https://youtu.be/HuaZdqoQ7_c
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Interface in angular?
Interface basically is a structure contract that identifies a related set of properties and methods to be implemented by a class.

A Class or Object that derived from an Interface, must follow/implement the structure provided by their Interface otherwise It is a compile time error.

Typescript uses Interface for strongly-typed data checking at compile time.

In Typescript sometime Interface also known as ‘duck typing’ or ‘structural subtyping’.

Use Interface keyword to create an Interface.

It is common to use ‘I’ as prefix with interface name. However some interface in angular, does not have prefix i.e. OnInit, OnChanges etc.

As in general OOPs, Interface members are public by default and does not requires explicit access modifiers. It is compile time error if explicit access modifiers.

Use the implements keyword to make a class implement an Interface.