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flatten array of arbitrary length
function flattenArray(arr) {
return arr.reduce((acc, e) => {
if(Array.isArray(e)){
return acc.concat(flattenArray(e));
}
acc.push(e);
return acc;
}, []);
}
const a = [ [ 1, 2, [ 3 ] ], 4 ];
console.log(flattenArray(a));
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