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October 13, 2016 18:01
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Recursive implementation of map in ES5.
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| function map(arr, fn) { | |
| var head = arr[0]; | |
| var tail = arr.slice(1); | |
| if(head === undefined && tail.length === 0) return []; | |
| if(tail.length === 0) { | |
| return [ fn(head) ]; | |
| } | |
| return [].concat(fn(head), map(tail, fn)); | |
| } |
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