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Last change
on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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| 1 | import { EmptyError } from '../util/EmptyError';
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| 2 | import { filter } from './filter';
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| 3 | import { take } from './take';
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| 4 | import { defaultIfEmpty } from './defaultIfEmpty';
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| 5 | import { throwIfEmpty } from './throwIfEmpty';
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| 6 | import { identity } from '../util/identity';
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| 7 | export function first(predicate, defaultValue) {
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| 8 | const hasDefaultValue = arguments.length >= 2;
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| 9 | return (source) => source.pipe(predicate ? filter((v, i) => predicate(v, i, source)) : identity, take(1), hasDefaultValue ? defaultIfEmpty(defaultValue) : throwIfEmpty(() => new EmptyError()));
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| 10 | }
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| 11 | //# sourceMappingURL=first.js.map |
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