All files / src/bundle/utils array.ts

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export function flatMap<T, R>(arr: Array<T>, mapper: (a: T) => Array<R>): Array<R> {
  return arr.map(mapper).reduce((acc, val) => acc.concat(val), []);
}
 
export function diffArray<T>(arr1: Array<T>, arr2: Array<T>) {
  return arr1.filter((val) => !arr2.includes(val));
}
 
export const extractDuplicates = (arr: string[][]): string[][] => {
  const duplicates: string[] = Object.entries(
    flatMap(arr, (items) => items).reduce((counter: { [classId: string]: number }, value) => {
      if (!counter[value]) {
        counter[value] = 1;
      } else {
        counter[value]++;
      }
      return counter;
    }, {}),
  )
    .filter(([_, count]) => count > 1)
    .map(([value]) => value);
 
  const filtered = arr
    .map((items) => items.filter((item) => !duplicates.includes(item)))
    .filter((items) => items.length > 0);
 
  duplicates.forEach((duplicate) => filtered.push([duplicate]));
  return filtered;
};