1 | import { AsyncIterableX } from './asynciterablex';
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2 | import { bindCallback } from '../internal/bindcallback';
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3 | export class MapAsyncIterable extends AsyncIterableX {
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4 | constructor(source, selector) {
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5 | super();
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6 | this._source = source;
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7 | this._selector = selector;
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8 | }
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9 | async *[Symbol.asyncIterator]() {
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10 | let i = 0;
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11 | for await (let item of this._source) {
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12 | let result = await this._selector(item, i++);
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13 | yield result;
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14 | }
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15 | }
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16 | }
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17 | export function map(source, selector, thisArg) {
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18 | return new MapAsyncIterable(source, bindCallback(selector, thisArg, 2));
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19 | }
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20 |
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21 |
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