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understanding interface in typescript

1. interface is one of most important part of typescript they contain  properties function or event but only definition.



work code example->https://stackblitz.com/edit/typescript-gzh1np

example of interface is=>
//understanding interface in typescript
//a interface can be used liked a object in js
//for example
interface user
{
//string typer property
name:string,
//number type property
age:number
//string type property
occupation:string;
//height can be string or number :)
height:string|number
}
//create a instance of user
var manish:user={
name:"manish chauhan",
age:27,
occupation:"game developer",
height:30

}
//access a property
console.log(manish.name);
//example2------------------------------------------------>>
//interface can be nested for example suppose for example
//suppose a group of student from different class
interface student
{
studentName:string,
studentAge:number,
//student class can be string or number
studentClass:string|number,
//and optional parameter declare in a interface like below
dressCode?:string
}
//now student group which contain differnt class student
interface group
{
groupName:string,
group:student[]
}

//now there can a serval group inside one school so we create one more interface which contain holds all groups of one school
interface school
{
schoolName:string,
groups:group[];
}
//now solve this problem using nested interface

var myschool:school={
schoolName:"apj schoool",
groups:[
//first group
{
groupName:"apple group",
group:[
{
studentName:"manish rawat",
studentAge:18,
studentClass:"12"
} ,
{
studentName:"seema",
studentAge:18,
studentClass:"11"
},
{
studentName:"rahul",
studentAge:17,
studentClass:"11"
}
]
},
{
groupName:"mango group",
group:[
{
studentName:"jeet",
studentAge:18,
studentClass:"12"
} ,
{
studentName:"reena",
studentAge:18,
studentClass:"11"
},
{
studentName:"monu",
studentAge:17,
studentClass:"11"
}
]
}

]


}

//access any student
const student=myschool.groups[0].group[0];
console.log(student.studentName);
//access all student
//loop each group
myschool.groups.forEach((value,index)=>
{
//loop each group
value.group.forEach((subvalue,subindex)=>
{
//get each student value from each group
console.log(subvalue);
}
)
}
)
//using interface as a part of a class we can define all required function for a class
//class--------------------------
interface userInterFace
{
login(userName:string,password:student),
register(userName:string,password:student),
update(userId:number),
delete(userId:number)
}

class NewUser implements userInterFace
{
constructor()
{

}
login(userName:string,password:student)
{

}

register(userName:string,password:student)
{
}
update(userId:number)
{

}
delete(userId:number)
{

}
}
var x=new NewUser();
//x.update(2);  

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