Function equalArraysOrString

packages/router/src/utils/collection.ts:52–64

(
  a: string | readonly string[],
  b: string | readonly string[],
)

 * Test equality for arrays of strings or a string.
 */
export function equalArraysOrString(
  a: string | readonly string[],
  b: string | readonly string[],
): boolean {
  if (Array.isArray(a) && Array.isArray(b)) {
    if (a.length !== b.length) return false;
    const aSorted = [...a].sort();
    const bSorted = [...b].sort();
    return aSorted.every((val, index) => bSorted[index] === val);
  } else {
    return a === b;
  }
}

/**
 * Return the last element of an array.