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const justCoolStuff = (arr1, arr2) => arr1.filter(item => arr2.includes(item));

**compare two arrays and return a new array with only items present in both arrays:
const justCoolStuff = (arr1, arr2) => arr1.filter(item => arr2.includes(item));

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JAVASCRIPT

const justCoolStuff = (arr1, arr2) => arr1.filter(item => arr2.includes(item));

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