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| [0, ['a', 'b', 'c'], 2, 'd', 4, 5, 'f', 7, ['g', 'h'], 9].reduce(function rec (prev, curr) { | |
| if (/array/i.test(curr.constructor)) { | |
| return curr.reduce(rec, prev); | |
| } else if (/string/i.test(curr.constructor)) { | |
| prev.push(curr); | |
| } | |
| return prev; | |
| }, []); | |
| //["a", "b", "c", "d", "f", "g", "h"] |
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