Type de Typescript

 typeL'écriture courante de：

//Non utilisétype
let sum:(x:number,y:number) => number
sum=(x,y)=>x+y
const result = sum(1,2)
console.log(result)


//Utilisertype
type PlusType=(x:number,y:number)=>number
let sum2:PlusType=(x,y)=>x+y
const result2=sum2(2,3)
console.log(result2)

// typeCombinaison du type de Fédération
type strOrNum=string|number
let result3:strOrNum='12'
result3=12

//Plus souvent
type Directions='Up'|'Down'|'Left'|'Right'
let toWhere:Directions='Down'

//typeInterface de liaison
interface IName{name:string}
type IPerson=IName&{age:number}
let person:IPerson={name:'jim',age:123}