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Add support for concating iterators

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Signed-off-by: Sebastian Malton <sebastian@malton.name>
This commit is contained in:
Sebastian Malton 2023-01-03 10:31:18 -05:00
parent 2b33d5eed6
commit 9da08f4ac4
1 changed files with 12 additions and 0 deletions
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12
src/common/utils/iter.ts
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@ -12,6 +12,7 @@ interface Iterator<T> extends Iterable<T> {
collect<U>(fn: (values: Iterable<T>) => U): U; collect<U>(fn: (values: Iterable<T>) => U): U;
map<U>(fn: (val: T) => U): Iterator<U>; map<U>(fn: (val: T) => U): Iterator<U>;
flatMap<U>(fn: (val: T) => U[]): Iterator<U>; flatMap<U>(fn: (val: T) => U[]): Iterator<U>;
concat(src2: IterableIterator<T>): Iterator<T>;
join(sep?: string): string; join(sep?: string): string;
} }
@ -24,6 +25,7 @@ export function chain<T>(src: IterableIterator<T>): Iterator<T> {
find: (fn) => find(src, fn), find: (fn) => find(src, fn),
join: (sep) => join(src, sep), join: (sep) => join(src, sep),
collect: (fn) => fn(src), collect: (fn) => fn(src),
concat: (src2) => chain(concat(src, src2)),
[Symbol.iterator]: () => src, [Symbol.iterator]: () => src,
}; };
} }
@ -236,3 +238,13 @@ export function every<T>(src: Iterable<T>, fn: (val: T) => any): boolean {
return true; return true;
} }
export function* concat<T>(src1: IterableIterator<T>, src2: IterableIterator<T>): IterableIterator<T> {
for (const val of src1) {
yield val;
}
for (const val of src2) {
yield val;
}
}