51 lines
4.3 KiB
JavaScript
51 lines
4.3 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.flatMap = flatMap;
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exports.flatten = flatten;
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exports.partition = partition;
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exports.indexBy = indexBy;
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/**
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* Map a function over an array and concatenate the results
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*/
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function flatMap(xs, fn) {
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return flatten(xs.map(fn));
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}
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/**
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* Flatten a list of lists into a list of elements
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*/
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function flatten(xs) {
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return Array.prototype.concat.apply([], xs);
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}
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/**
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* Partition a collection by removing and returning all elements that match a predicate
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*
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* Note: the input collection is modified in-place!
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*/
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function partition(collection, pred) {
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const ret = [];
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let i = 0;
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while (i < collection.length) {
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if (pred(collection[i])) {
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ret.push(collection.splice(i, 1)[0]);
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}
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else {
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i++;
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}
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}
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return ret;
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}
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async function indexBy(xs, fn) {
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const ret = new Map();
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for (const x of xs) {
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const key = await fn(x);
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const group = ret.get(key);
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if (group) {
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group.push(x);
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}
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else {
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ret.set(key, [x]);
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}
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}
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return ret;
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}
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