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matthewblewitt/find-duplicates-in-array.js

Last active April 24, 2019 14:22
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Find duplicates in a array with array filter method
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find-duplicates-in-array.js
const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9];
const fibonacci = [0, 1, 1, 2, 3, 5, 8, 13];
const duplicates = numbers.filter(number => fibonacci.indexOf(number) !== -1);
console.log(duplicates); // [1, 2, 3, 5, 8]
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