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Data.Eq: add a disclaimer for eqArrayImpl shortcut #181

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Data.Eq: add a disclaimer for eqArrayImpl shortcut #181

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6 changes: 6 additions & 0 deletions src/Data/Eq.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,13 @@ exports.refEq = function (r1) {
exports.eqArrayImpl = function (f) {
return function (xs) {
return function (ys) {

/* disclaimer: this check might break referential equality
for non-lawful instances of `Eq` (e.g. `eq _ _ = false`).
We strongly discourage unlawful instances, so it shouldn't
be a problem in practice. */
if (xs === ys) return true;

if (xs.length !== ys.length) return false;
for (var i = 0; i < xs.length; i++) {
if (!f(xs[i])(ys[i])) return false;
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