65 lines
1.4 KiB
JavaScript
65 lines
1.4 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.nilHelper = nilHelper;
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exports.mapHelper = mapHelper;
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exports.flatMapHelper = flatMapHelper;
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exports.filterHelper = filterHelper;
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exports.takeNHelper = takeNHelper;
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exports.takeWhileHelper = takeWhileHelper;
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exports.joinHelper = joinHelper;
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class Nil {
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[Symbol.iterator]() {
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return this;
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}
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next(value) {
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return { value, done: true };
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}
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}
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Nil.nil = new Nil();
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function nilHelper() {
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return Nil.nil;
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}
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function* mapHelper(g, f) {
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for (const v of g) {
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yield f(v);
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}
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}
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function* flatMapHelper(g, f) {
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for (const v of g) {
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yield* f(v);
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}
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}
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function* filterHelper(g, f) {
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for (const v of g) {
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if (f(v)) {
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yield v;
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}
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}
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}
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function* takeNHelper(g, n) {
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for (let i = 0; i < n; ++i) {
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const cur = g.next();
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if (cur.done) {
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break;
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}
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yield cur.value;
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}
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}
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function* takeWhileHelper(g, f) {
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let cur = g.next();
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while (!cur.done && f(cur.value)) {
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yield cur.value;
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cur = g.next();
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}
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}
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function* joinHelper(g, others) {
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for (let cur = g.next(); !cur.done; cur = g.next()) {
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yield cur.value;
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}
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for (const s of others) {
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for (let cur = s.next(); !cur.done; cur = s.next()) {
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yield cur.value;
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}
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}
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}
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