Q:

Write a JavaScript program to apply a function against an accumulator and each key in the object (from left to right)

hamza
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2022-05-18
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Write a JavaScript program to apply a function against an accumulator and each key in the object (from left to right). 

JavaScript programming, Programming,
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hamza
2022-05-18
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const transform = (obj, fn, acc) => Object.keys(obj).reduce((a, k) => fn(a, obj[k], k, obj), acc);
console.log(transform(
  { a: 1, b: 2, c: 1 },
  (r, v, k) => {
    (r[v] || (r[v] = [])).push(k);
    return r;
  },
  {}
));

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