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// Remove Duplicates from an array | |
const removeDuplicates = | |
arr => arr.filter((item, index) => index === arr.indexOf(item)); | |
const removeDuplicates1 = array => [...new Set(array)]; | |
const removeDuplicates2 = array => Array.from(new Set(array)); | |
// Flattens an array(doesn't flatten deeply). |