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type aliases implementing your own type in typescript

 type aliases or your own type is one of the most important part of typescript see how you can implement type aliases in typescript using type .

link->https://stackblitz.com/edit/typescript-7barjt

//creating your own type or type alias in typescript is very easy for example


//direction type what only allowed dirction values
export type Direction="north"|"south"|"east"|"west";
//strArray allowed only string and array where array is number of boolean type
export type strArray=string|Array<number|boolean>;
//an interfacce type---------
export type userdd=userDD;

interface userDD
{
userDirection:Direction
username:string
}
class human
{
private direction:Direction;
private myarray:strArray;
private newuser:userdd;
constructor()
{
/*
myarray is string and array type where Array is number or boolean
type so any other value in myarray not allowed
*/
//not allowed
//this.myarray=["manish"]

//allowrd
this.myarray=[true,false];
//newuser is userDD type so both below value allowed because
username is string type and userDirection is direction type
this.newuser={
username:"manish",
userDirection:"east"
}
}
public setDirection(_direction:Direction)
{
this.direction=_direction;
}
public getDirection()
{
return this.direction;
}
public moveMe()
{
switch(this.direction)
{
case "north":
console.log("move north")
break;
case "south":
console.log("move south")
break;
case "east":
console.log("move east")
break;
case "west":
console.log("move west")
break;
}
}
}
//check your type
var h=new human();
h.setDirection("north")//move human to north direction
h.moveMe();

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