deno.land / x / froebel@v0.23.2 / zip.ts
123456789101112131415161718192021222324252627282930313233343536373839404142export type Zip<T extends unknown[][]> = { [I in keyof T]: T[I] extends (infer U)[] ? U : never;}[];
/** * Takes multiple lists and returns a list of tuples containing the value in * each list at the current index. If the lists are of different lengths, the * returned list of tuples has the length of the shortest passed in list. * * @example * ``` * const pairs = zip([1,2,3], ['a','b','c']) * console.log(pairs) // prints: [[1,'a'], [2,'b'], [3,'c']] * ``` */const zip = <T extends unknown[][]>(...lists: T): Zip<T> => [...Array(Math.min(...lists.map(({ length }) => length)))].map((_, i) => lists.map((l) => l[i]) ) as any;
export default zip;
/** * Same as {@link zip} but also takes a `zipper` function, that is called for * each index with the element at current index in each list as arguments. The * result of `zipper` is the element at current index in the list returned from * `zipWith`. * * @example * ``` * const sums = zipWith((a,b) => a+b, [1,2,3], [4,5,6]) * console.log(sums) // prints: [5,7,9] * ``` */export const zipWith = <T extends unknown[][], U>( zipper: (...args: Zip<T>[0]) => U, ...lists: T): U[] => [...Array(Math.min(...lists.map(({ length }) => length)))].map((_, i) => zipper(...(lists.map((l) => l[i]) as any)) );
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