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heikkipesonen/deep-typed-path.ts

Last active February 22, 2019 20:38
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  1. heikkipesonen revised this gist Feb 22, 2019. No changes.
  2. heikkipesonen created this gist Feb 22, 2019.
    14 changes: 14 additions & 0 deletions deep-typed-path.ts
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,14 @@
    type KeyOf<T> = keyof T

    function get<T, K1 extends KeyOf<T>>(o: T, p1: K1): T[K1]
    function get<T, K1 extends KeyOf<T>, K2 extends KeyOf<T[K1]>>(o: T, p1: K1, p2: K2): T[K1][K2]
    function get<T, K1 extends KeyOf<T>, K2 extends KeyOf<T[K1]>, K3 extends KeyOf<T[K1][K2]>>(o: T, p1: K1, p2: K2, p3: K3): T[K1][K2][K3]
    function get<T, K1 extends KeyOf<T>, K2 extends KeyOf<T[K1]>, K3 extends KeyOf<T[K1][K2]>, K4 extends KeyOf<T[K1][K2][K3]>>(o: T, p1: K1, p2: K2, p3: K3, p4: K4): T[K1][K2][K3][K4]
    function get<T, K1 extends KeyOf<T>, K2 extends KeyOf<T[K1]>, K3 extends KeyOf<T[K1][K2]>, K4 extends KeyOf<T[K1][K2][K3]>, K5 extends KeyOf<T[K1][K2][K3][K4]>>(o: T, p1: K1, p2: K2, p3: K3, p4: K4, p5: K5): T[K1][K2][K3][K4][K5]
    function get<T, K1 extends KeyOf<T>, K2 extends KeyOf<T[K1]>, K3 extends KeyOf<T[K1][K2]>, K4 extends KeyOf<T[K1][K2][K3]>, K5 extends KeyOf<T[K1][K2][K3][K4]>>(o: T, p1: K1, p2?: K2, p3?: K3, p4?: K4, p5?: K5) {
    return p5 && p4 && p3 && p2 ? o[p1][p2][p3][p4][p5] :
    p4 && p3 && p2 ? o[p1][p2][p3][p4] :
    p3 && p2 ? o[p1][p2][p3] :
    p2 ? o[p1][p2] :
    o[p1]
    }