README - Type Challenges

<h1>MapTypes </h1><blockquote><p>by Krzysztof "Wokay" Łokaj <a href="https://github.com/wokayme" target="_blank">@wokayme</a></p></blockquote><p><a href="https://tsch.js.org/5821/play" target="_blank"></a> </p>

Implement MapTypes<T, R> which will transform types in object T to different types defined by type R which has the following structure

type StringToNumber = {
  mapFrom: string; // value of key which value is string
  mapTo: number; // will be transformed for number
}

Examples:

type StringToNumber = { mapFrom: string; mapTo: number;}
MapTypes<{iWillBeANumberOneDay: string}, StringToNumber> // gives { iWillBeANumberOneDay: number; }

Be aware that user can provide a union of types:

type StringToNumber = { mapFrom: string; mapTo: number;}
type StringToDate = { mapFrom: string; mapTo: Date;}
MapTypes<{iWillBeNumberOrDate: string}, StringToDate | StringToNumber> // gives { iWillBeNumberOrDate: number | Date; }

If the type doesn't exist in our map, leave it as it was:

type StringToNumber = { mapFrom: string; mapTo: number;}
MapTypes<{iWillBeANumberOneDay: string, iWillStayTheSame: Function}, StringToNumber> // // gives { iWillBeANumberOneDay: number, iWillStayTheSame: Function }