TypeScript recursive map

map-recursive.ts

/*
*   mapRecursive
*   author: Aurélien Dupays Dexemple
*/

export const isUndefined = (obj: any): obj is undefined => typeof obj === 'undefined';

export function mapRecursive<TInput, TOutput>(fn: (e: TInput, index?: number) => TOutput, [first, ...rest]: TInput[], index: number = 0): TOutput[] {
    return isUndefined(first) ? [] : [fn(first, index), ...mapRecursive(fn, rest, ++index)];
};

Hi SugarDarius,
would you mind giving an example of using this function. On first look I can get the children of first but am struggling a little to get the rest?

Merci

Hi @mcaple.
A relevant example of using this function is mapping on a tree data structure with a lower complexity.

KR,