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- function flat(array) {
- var ret = [];
- array.forEach(function (item) {
- if (Array.isArray(item)) {
- ret = ret.concat(flat(item));
- } else {
- ret.push(item);
- }
- });
- return ret;
- }
- var inputArray = [[1,2,[3]],4];
- alert(flat(inputArray));
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