8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
539 B
539 B
transform
Applies a function against an accumulator and each key in the object (from left to right).
Use Object.keys(obj) to iterate over each key in the object, Array.prototype.reduce() to call the apply the specified function against the given accumulator.
const transform = (obj, fn, acc) => Object.keys(obj).reduce((a, k) => fn(a, obj[k], k, obj), acc);
transform(
{ a: 1, b: 2, c: 1 },
(r, v, k) => {
(r[v] || (r[v] = [])).push(k);
return r;
},
{}
); // { '1': ['a', 'c'], '2': ['b'] }