Flatten Array, Create Emitter

Question

Anonymous · Accepted Answer

Shortest way to flatten an array I could come up with:

function flatten(a) {
    return Array.isArray(a) ? [].concat(...a.map(flatten)) : a;
}

Sonia · Answer

to flatten nested arrays : 

const flatten = array => {

return array.reduce((elem, acc) => {
  return elem.concat(Array.isArray(acc) ? flatten(acc) : acc);
}, []);

}

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