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export function pick<T, K extends keyof T>(obj: T, ...keys: K[]): Pick<T, K> {
const ret: any = {};
keys.forEach((key) => {
ret[key] = obj[key];
});
return ret;
}
export function uniq<T>(arr: T[]): T[] {
return Array.from(new Set(arr));
}
export function uniqBy<T>(arr: T[], fn: (item: T) => any): T[] {
const set = new Set();
return arr.filter((item) => {
const val = fn(item);
if (set.has(val)) {
return false;
}
set.add(val);
return true;
});
}