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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | 9x 9x 9x 28x 28x 18x | import { Predicate } from "@benneq/predicate";
/**
* Omits the first elements of an {@link Iterable} until a {@link Predicate}
* returns `false`.
*
* @example
* ```ts
* const dropWhileLessThan3 = dropWhile(x => x < 3);
* const iterable = dropWhileLessThan3([1,3,2,4]);
* console.log(iterable); // [3,2,4]
* ```
*
* @see {@link limit}, {@link skip} and {@link takeWhile} for similar operations.
*
* @typeParam T - the {@link Iterable} value type
* @param predicate
* @returns an {@link Iterable} that does not emit values until the given {@link Predicate} returns `false`
*/
type DropWhile = <T>(
predicate: Predicate<[T]>
) => (iterable: Iterable<T>) => IterableIterator<T>;
export const dropWhile: DropWhile = (predicate) =>
function* (
iterable,
// internal variables:
drop = true
) {
for (const value of iterable) {
drop &&= predicate(value);
if (!drop) {
yield value;
}
}
};
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