2018-09-05 12:16:08 -05:00
|
|
|
export function countIf<T>(f: (x: T) => boolean, xs: T[]): number {
|
|
|
|
|
return xs.filter(f).length;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
export function count<T>(x: T, xs: T[]): number {
|
|
|
|
|
return countIf(y => x === y, xs);
|
|
|
|
|
}
|
2018-09-05 12:28:04 -05:00
|
|
|
|
|
|
|
|
export function intersperse<T>(sep: T, xs: T[]): T[] {
|
|
|
|
|
return [].concat(...xs.map(x => [sep, x])).slice(1);
|
|
|
|
|
}
|
