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Просмотр файла: FoldableWithIndex.js
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
/**
* @file A `Foldable` with an additional index.
* A `FoldableWithIndex` instance must be compatible with its `Foldable` instance
*
* ```ts
* reduce(fa, b, f) = reduceWithIndex(fa, b, (_, b, a) => f(b, a))
* foldMap(M)(fa, f) = foldMapWithIndex(M)(fa, (_, a) => f(a))
* reduceRight(fa, b, f) = reduceRightWithIndex(fa, b, (_, a, b) => f(a, b))
* ```
*/
import { getFoldableComposition } from './Foldable';
export function getFoldableWithIndexComposition(F, G) {
return __assign(__assign({}, getFoldableComposition(F, G)), { reduceWithIndex: function (fga, b, f) {
return F.reduceWithIndex(fga, b, function (fi, b, ga) { return G.reduceWithIndex(ga, b, function (gi, b, a) { return f([fi, gi], b, a); }); });
}, foldMapWithIndex: function (M) {
var foldMapWithIndexF = F.foldMapWithIndex(M);
var foldMapWithIndexG = G.foldMapWithIndex(M);
return function (fga, f) { return foldMapWithIndexF(fga, function (fi, ga) { return foldMapWithIndexG(ga, function (gi, a) { return f([fi, gi], a); }); }); };
}, reduceRightWithIndex: function (fga, b, f) {
return F.reduceRightWithIndex(fga, b, function (fi, ga, b) { return G.reduceRightWithIndex(ga, b, function (gi, a, b) { return f([fi, gi], a, b); }); });
} });
}
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