Q:

Write a JavaScript program to return the difference between two arrays, after applying the provided function to each array element of both

hamza
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2022-05-18
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Write a JavaScript program to return the difference between two arrays, after applying the provided function to each array element of both.

JavaScript programming, Programming,
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hamza
2022-05-18
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const differenceBy = (a, b, fn) => {
  const s = new Set(b.map(v => fn(v)));
  return a.filter(x => !s.has(fn(x)));
};
console.log(differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor));
console.log(differenceBy([{ x: 2 }, { x: 1 }], [{ x: 1 }], v => v.x));

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