Record<K, T>
개념
key가 K Type으로, value에 대한 값이 T인 객체 타입
v2.1부터 도입
type Record<K extends string, number, symbol, T> = {
[P in K]: T
}Examples
문자열 리터럴 key
type names = 'chuck' | 'mary'
type family = Record<names, number>
const myFamily: family = {
chuck: 20,
mary: 30,
}enum key
enum names {
'chuck' = 1
'mary' = 2
}
type family = Record<names, number>
const myFamily: family = {
chuck: 20,
mary: 30,
}
keyof key
type student = {
name: string
age: number
address: string
gpa: number
}
type studentRecordType = Record<keyof student, string>
const studentImpl: studentRecordType = {
name: 'chuck',
age: '30',
address: 'younin'
gpa: '4.0'
}
//with interface
interface student {
name: string
age: number
address: string
gpa: number
}
const studentImpl: Record<keyof student, string> = {
name: 'chuck',
age: '30',
address: 'younin',
gpa: '4.0'
}