Mapping over plain objects in JS

obj-map.js

// objMap(x => x*x, {a: 2, b: 3}) -> {a: 4, b: 9}
const objMap = (f, obj) =>
  Object
    .entries(obj)
    .reduce((acc, [k, v]) =>
      (acc[k] = f(v, k, obj), acc)
    , {});


// Need this function or equivalent to deep map
const isPlainObject = require('lodash.isplainobject');

// objDeepMap(x => x*x, {a: 2, b: {c: 3}}) -> {a: 4, b: {c: 9}}
const objDeepMap = (f, obj) =>
  Object
    .entries(obj)
    .reduce((acc, [k, v]) =>
      isPlainObject(v)
      ? (acc[k] = objDeepMap(f, v), acc)
      : (acc[k] = f(v, k, obj), acc)
    , {});