11 lines
402 B
TypeScript
11 lines
402 B
TypeScript
|
interface Sequence<T> {
|
||
|
|
each(iterator: (value: T) => void): void;
|
||
|
|
map<U>(iterator: (value: T) => U): Sequence<U>;
|
||
|
|
filter(iterator: (value: T) => boolean): Sequence<T>;
|
||
|
|
groupBy<K>(keySelector: (value: T) => K): Sequence<{ key: K; items: T[]; }>;
|
||
|
|
}
|
||
|
|
|
||
|
|
var s: Sequence<string>;
|
||
|
|
var s2 = s.groupBy(s => s.length);
|
||
|
|
var s3 = s2.each(x => { x.key /* Type is K, should be number */ });
|