JavaScript: Flatten an array using the recursive method
let output = [];
function flattenArray(arr) {
for (let i = 0; i < arr.length; i++) {
if (Array.isArray(arr[i])) {
flattenArray(arr[i]);
} else {
output.push(arr[i]);
}
}
return output;
}
console.log(flattenArray([[[1, [...
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