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- var array = [[['a','b','c'],[1,2,3]],[],[['d','e','f','g','h'],[4,5,6,7]]]
- function flat(data) {
- return data.reduce((r, e) => r.concat(Array.isArray(e) ? flat(e) : e), [])
- }
- console.log(flat(array))
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