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iterators
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Fix imapfilter typing

This commit is contained in:
Michaël Lemaire 2021-08-26 23:50:26 +02:00
parent 43d5678697
commit 8fbb5c4ad1
1 changed files with 5 additions and 6 deletions
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11
mod.ts
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@ -341,17 +341,16 @@ export function ifilter<T>(
/**
* Apply map, and filter invalid results in the same pass.
*/
export function imapfilter<T1, T2, E>(
export function imapfilter<T1, T2>(
iterable: Iterable<T1>,
mapfunc: (_: T1) => Exclude<T2, E> | typeof exclusion,
exclusion: E = null as unknown as E,
): Iterable<T2> {
mapfunc: (_: T1) => T2 | null,
): Iterable<Exclude<T2, null>> {
return {
[Symbol.iterator]: function* () {
for (let value of iterable) {
const mapped = mapfunc(value);
if (mapped !== exclusion) {
yield mapped as T2;
if (mapped !== null) {
yield mapped as Exclude<T2, null>;
}
}
},