Arrays utils

arrays.utils.ts

<!-- Helpers -->
const isFiniteNumber = (n: any): n is number => Number.isFinite(n);
const isString = (s: any): s is string => s === '' || (s && typeof s.valueOf() === 'string');

const matchId = (valueToMatch: string) => (item: { id: string }) => valueToMatch === item.id;

const sortBy = <T>(valueGetterFn: (item: T) => number | string, direction: 'asc' | 'desc') => (itemA: T, itemB: T): number => {
  const a = valueGetterFn(itemA);
  const b = valueGetterFn(itemB);

  if (isFiniteNumber(a) && isFiniteNumber(b)) {
    return direction === 'asc' ? a - b : b - a;
  } else if (isString(a) && isString(b)) {
    return direction === 'asc' ? (a < b ? -1 : 1) : a < b ? 1 : -1;
  }

  return 0;
};