itertools-ts
Version:
Extended itertools port for TypeScript and JavaScript. Provides a huge set of functions for working with iterable collections (including async ones)
92 lines • 4.11 kB
JavaScript
var __asyncValues = (this && this.__asyncValues) || function (o) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var m = o[Symbol.asyncIterator], i;
return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
};
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
var i, p;
return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: false } : f ? f(v) : v; } : f; }
};
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var g = generator.apply(thisArg, _arguments || []), i, q = [];
return i = Object.create((typeof AsyncIterator === "function" ? AsyncIterator : Object).prototype), verb("next"), verb("throw"), verb("return", awaitReturn), i[Symbol.asyncIterator] = function () { return this; }, i;
function awaitReturn(f) { return function (v) { return Promise.resolve(v).then(f, reject); }; }
function verb(n, f) { if (g[n]) { i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; if (f) i[n] = f(i[n]); } }
function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
function fulfill(value) { resume("next", value); }
function reject(value) { resume("throw", value); }
function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
import { toAsyncIterable, toIterable } from "./transform";
/**
* Count sequentially forever
*
* @param start (optional, default 1)
* @param step (optional, default 1)
*/
export function* count(start = 1, step = 1) {
for (let i = start; true; i += step) {
yield i;
}
}
/**
* Cycle through the elements of a collection sequentially forever
*
* @param iterable
*/
export function* cycle(iterable) {
const data = [...toIterable(iterable)];
if (data.length === 0) {
return;
}
while (true) {
for (const datum of data) {
yield datum;
}
}
}
/**
* Cycle through the elements of a async iterable sequentially forever
*
* @param iterable
*/
export function cycleAsync(iterable) {
return __asyncGenerator(this, arguments, function* cycleAsync_1() {
var _a, e_1, _b, _c;
const data = [];
try {
for (var _d = true, _e = __asyncValues(toAsyncIterable(iterable)), _f; _f = yield __await(_e.next()), _a = _f.done, !_a; _d = true) {
_c = _f.value;
_d = false;
const datum = _c;
data.push(datum);
yield yield __await(datum);
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (!_d && !_a && (_b = _e.return)) yield __await(_b.call(_e));
}
finally { if (e_1) throw e_1.error; }
}
yield __await(yield* __asyncDelegator(__asyncValues(cycle(data))));
});
}
/**
* Repeat an item forever
*
* @param item
*/
export function* repeat(item) {
while (true) {
yield item;
}
}
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