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Isabelle Viktoria Maciohsek
2020-10-22 20:24:30 +03:00
parent d35575373f
commit 5cb69e3c5c
58 changed files with 195 additions and 126 deletions
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10
snippets/symmetricDifferenceBy.md
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@ -5,7 +5,8 @@ tags: array,intermediate
Returns the symmetric difference between two arrays, after applying the provided function to each array element of both.
- Create a `Set` by applying `fn` to each array's elements, then use `Array.prototype.filter()` on each of them to only keep values not contained in the other.
- Create a `new Set()` from each array to get the unique values of each one after applying `fn` to them.
- Use `Array.prototype.filter()` on each of them to only keep values not contained in the other.
```js
const symmetricDifferenceBy = (a, b, fn) => {
@ -17,5 +18,10 @@ const symmetricDifferenceBy = (a, b, fn) => {
```js
symmetricDifferenceBy([2.1, 1.2], [2.3, 3.4], Math.floor); // [ 1.2, 3.4 ]
symmetricDifferenceBy([{ id: 1 }, { id: 2 }, { id: 3 }], [{ id: 1 }, { id: 2 }, { id: 4 }], i => i.id) // [{ id: 3 }, { id: 4 }]
symmetricDifferenceBy(
[{ id: 1 }, { id: 2 }, { id: 3 }],
[{ id: 1 }, { id: 2 }, { id: 4 }],
i => i.id
);
// [{ id: 3 }, { id: 4 }]
```