Simple fuzzy search in TS

fuzzySearch.ts

function fuzzySearch(source: string, query: string, isIgnoreCase?: boolean): boolean {
  if (source.length === 0 || query.length === 0) {
    return false;
  }

  const _source = isIgnoreCase ? source.toLowerCase() : source;
  const _query = isIgnoreCase ? query.toLowerCase() : query;

  const queryIterator = function*() {
    yield* [..._query];
  };

  const itr = queryIterator();
  let cur = itr.next();
  for (const c of _source) {
    if (c === cur.value) {
      cur = itr.next();
    }

    if (cur.done) {
      return true;
    }
  }

  return false;
}

function test(source: string, query: string, expected: boolean) {
  const got = fuzzySearch(source, query);

  console.log(`fuzzySearch("${source}", "${query}")`);
  console.log(`  got:      ${got}`);
  console.log(`  expected: ${expected}`);
}

test("FooBarBaz", "FBB", true);
test("FooBarBaz", "ar", true);
test("FooBarBaz", "Baz", true);
test("FooBarBaz", "z", true);
test("FooBarBaz", "FooBarBaz", true);
test("FooBarBaz", "ooaraz", true);
test("FooBarBaz", "hoge", false);
test("FooBarBaz", "", false);
test("Foo", "FooBarBaz", false);