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let array = [[1,2,[3]],4]; | |
const flatten = arr => arr.reduce((a, b) => a.concat(Array.isArray(b) | |
? flatten(b) | |
: b), []); | |
let newArray = flatten(array); | |
// Old Array | |
console.log(array) | |
// New Array flattened | |
console.log(newArray) |
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