export function countMatches(items: string[], target: string): number {
  let count = 0;

  for (const item of items) {
    // TODO: update count only when item matches target.
  }

  return count;
}

console.assert(countMatches(["coin", "trap", "coin"], "coin") === 2);
console.assert(countMatches(["trap"], "coin") === 0);
console.assert(countMatches([], "coin") === 0);