Zamin ichidagi promiseler JavaScriptda

Zanjir funksiyalari shuningdek promiselarni qaytarishi mumkin. Bunda ushbu promisening natijasi keyingi then ga tushadi:

javascriptpromise.then(
  function(result) {
    return result + '1';
  }
).then(
  function(result) {
    return new Promise(function(resolve) {
      resolve(result + '2'); // ushbu natija keyingi then ga tushadi
    });
  }
).then(
  function(result) {
    return result + '3';
  }
).then(
  function(result) {
    console.log(result); // 'string123' ni chiqaradi
  }
);