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es6 recursion
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| 'use strict'; | |
| const flatten = (...args) => { | |
| let [head, ...tail] = args; | |
| return head === undefined | |
| ? [] | |
| : ( Array.isArray(head) ? [...flatten(...head), ...flatten(...tail)] : [head, ...flatten(...tail)] ) | |
| ; | |
| } |
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