MaxInterview - array intersection javascript es6

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1const arr1 = [{ id: 1 }, { id: 2 }]
2const arr2 = [{ id: 1 }, { id: 3 }]
3const intersection = arr1.filter(item1 => arr2.some(item2 => item1.id === item2.id))
4// intersection => [{ id: 1 }]

1const intersection = (a, b) => {
2  b = new Set(b); // recycling variable
3  return [...new Set(a)].filter(e => b.has(e));
4};
5
6console.log(intersection([1, 2, 3, 1, 1], [1, 2, 4])); // Array [ 1, 2 ]

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