Generic function to map object property name

Question

I want to create a generic map function that takes any type object as first argument and one prefix string as second argument that will be concatenated to object's property name with same value and returns this new created object.

captain-yossarian from Ukraine · Accepted Answer · 2021-11-14 18:16:38Z

2

Related question

Consider this exmaple:


type Remap<Obj, Prefix extends string> = {
  [Prop in keyof Obj as `${Prefix}${Prop & string}`]: Obj[Prop]

}
const map = <Obj, Prefix extends string>(obj: Obj, prefix: Prefix) =>
  (Object.keys(obj) as Array<keyof Obj & string>).reduce((acc, elem) => ({
    ...acc,
    [`${prefix}${elem}`]: obj[elem]
  }), {} as Remap<Obj, Prefix>)

const result = map({
  one: 1,
  two: 2,
  three: 3
}, 'set_')

result.set_one //
result.set_two

Playground

See key-remapping

I have used as type asserion because this is the only way to go in this particular case

answered Nov 14, 2021 at 18:16

captain-yossarian from Ukraine

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1 Comment

samadadi Over a year ago

Thank you. I appreciate your help.

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