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ES6 reduce implementation using recursion and destructuring
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| function reduce([ head, ...tail ], fn, initial) { | |
| if(head === undefined && tail.length === 0) return initial; | |
| if(!initial) { | |
| const [ newHead, ...newTail] = tail; | |
| return reduce(newTail, fn, fn(head, newHead)); | |
| } | |
| return tail.length ? reduce(tail, fn, fn(initial, head)) : [ fn(initial, head) ]; | |
| } |
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Wow.