36 lines
1.2 KiB
JavaScript
36 lines
1.2 KiB
JavaScript
import { dropWhile as dropWhile$1 } from "../../array/dropWhile.mjs";
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import { combineEagerAndLazyFunctions } from "../_internal/lazy.mjs";
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//#region src/fp/array/dropWhile.ts
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/**
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* Creates a function that removes leading values while a predicate returns true.
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*
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* Once the predicate returns false, that value and all following values are
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* emitted. The returned function is lazy-capable inside {@link pipe}.
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*
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* @template T - The type of elements in the array.
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* @param predicate - Called with each leading value and index while values are being dropped.
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* @returns A function that maps the piped array to the remaining suffix.
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*
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* @example
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* import { dropWhile, pipe } from 'es-toolkit/fp';
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*
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* pipe([1, 2, 3, 1], dropWhile(value => value < 3));
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* // => [3, 1]
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*/
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function dropWhile(predicate) {
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function dropWhileEager(array) {
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return dropWhile$1(array, (item, index) => predicate(item, index));
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}
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const dropWhileLazy = (emit) => {
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let dropping = true;
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let index = 0;
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return (value) => {
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if (dropping && predicate(value, index++)) return true;
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dropping = false;
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return emit(value);
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};
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};
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return combineEagerAndLazyFunctions(dropWhileEager, dropWhileLazy);
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}
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//#endregion
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export { dropWhile };
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