Created
September 21, 2018 03:46
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helper like ruby's Enumerable#each_slice
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| extension Array { | |
| func eachSlice(_ step: Int) -> [[Element]] { | |
| return stride(from: 0, through: count, by: step) | |
| .lazy | |
| .map { from in | |
| let to = Swift.min(from + step, count) | |
| return (from..<to) | |
| .lazy | |
| .map { [self[$0]] } | |
| .reduce([], +) | |
| } | |
| } | |
| } |
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