All files / array/operator collect.ts

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import {flatten} from './flatten';
import {UnaryFunction} from 'fnxt/fnxt-types';
 
function getArr<F>(e: Iterable<F>): F[] {
  return Array.isArray(e) ? e : [...e];
}
 
export const collect = <E, F>(fn: UnaryFunction<E, Iterable<F>>) => (array: E[]): F[] =>
  flatten(array.map(e => getArr(fn(e))));