Created
May 14, 2022 03:45
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TypeScript Patterns in a functional approach
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type ShallowObject = Record<string, string | number | boolean> | |
type User = Partial<{ | |
name: string | |
email: string | |
}> & ShallowObject | |
type UserBuilder = { | |
addName: (name: string) => UserBuilder | |
addEmail: (email: string) => UserBuilder | |
addProperties: (properties: ShallowObject) => UserBuilder | |
build: () => User | |
} | |
function buildUser(): UserBuilder { | |
let user: User = {} | |
const buildTools: UserBuilder = { | |
addName(name: string) { | |
user.name = name | |
return buildTools | |
}, | |
addEmail(email) { | |
user.email = email | |
return buildTools | |
}, | |
addProperties(properties: ShallowObject) { | |
user = { ...user, ...properties } | |
return buildTools | |
}, | |
build: () => user, | |
} | |
return { | |
addName: buildTools.addName, | |
addEmail: buildTools.addEmail, | |
addProperties: buildTools.addProperties, | |
build: buildTools.build, | |
} | |
} | |
const loremIpsum = buildUser() | |
.addName('Lorem Ipsum') | |
.addEmail('lipsum@gmail.com') | |
.addProperties({ age: 1742, isRandomText: true }) | |
.build() |
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