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Adds new iterator methods

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Eric Amodio
2017-01-02 00:07:01 -05:00
parent a52b0c9b73
commit 567533622c
1 changed files with 38 additions and 0 deletions
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38
src/system/iterable.ts
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@@ -1,6 +1,13 @@
'use strict';
export namespace Iterables {
export function every<T>(source: Iterable<T> | IterableIterator<T>, predicate: (item: T) => boolean): boolean {
for (const item of source) {
if (!predicate(item)) return false;
}
return true;
}
export function* filter<T>(source: Iterable<T> | IterableIterator<T>, predicate: (item: T) => boolean): Iterable<T> {
for (const item of source) {
if (predicate(item)) yield item;
@@ -39,6 +46,10 @@ export namespace Iterables {
}
}
export function has<T>(source: Iterable<T> | IterableIterator<T>, item: T): boolean {
return some(source, _ => _ === item);
}
export function isIterable(source: Iterable<any>): boolean {
return typeof source[Symbol.iterator] === 'function';
}
@@ -59,10 +70,37 @@ export namespace Iterables {
return source.next().value;
}
export function* skip<T>(source: Iterable<T> | IterableIterator<T>, count: number): Iterable<T> {
let i = 0;
for (const item of source) {
if (i >= count) yield item;
i++;
}
}
export function some<T>(source: Iterable<T> | IterableIterator<T>, predicate: (item: T) => boolean): boolean {
for (const item of source) {
if (predicate(item)) return true;
}
return false;
}
export function* take<T>(source: Iterable<T> | IterableIterator<T>, count: number): Iterable<T> {
if (count > 0) {
let i = 0;
for (const item of source) {
yield item;
i++;
if (i >= count) break;
}
}
}
export function* union<T>(...sources: (Iterable<T> | IterableIterator<T>)[]): Iterable<T> {
for (const source of sources) {
for (const item of source) {
yield item;
}
}
}
}