abiodun0 · May 28, 2017 22:39
diff --git a/pairs.cls b/pairs.cls
 (partition 2 1 [1, 2, 3, 4, 5]) ;;=> ((1 2) (2 3) (3 4) (4 5))
diff --git a/pairs.elm b/pairs.elm
 pairs : List x -> List (x, x)
 pairs ls =
  case ls of
    []         -> []
    _ :: []    -> []
    (a::b::xs) -> (a, b) :: pairs (b::xs)
diff --git a/pairs.js b/pairs.js
 function pairs (coll) {
    if (coll.length < 2) {
        return [];
    }
    const [first, second, ...rest] = coll;
    return [[first, second]].concat(pairs([second, ...rest]));
 }
	function pairs (coll) {
	if (coll.length < 2) {
	return [];
	}
	const [first, second, ...rest] = coll;
	return [[first, second]].concat(pairs([second, ...rest]));
	}
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