then() and catch() for Promises

 function saveToDB() {

  return new Promise((resolve, reject) => {

    let internetSpeed = Math.floor(Math.random() * 10) + 1;

    if (internetSpeed > 4) {

      resolve("success:data saved");

    } else {

      reject("failure:weak connection");

    }

  });

}

 let req= saveToDB("Abhiii");

    req.then(() => {

        console.log(req);

      console.log("promise was resolved");

    })

    .catch(() => {

        console.log(req);

      console.log("Promise was rejected");

    });

    // IT CAN ALSO BE WRITTEN AS

    // saveToDB("Abhiii").then(()=>{

    //     console.log("Promise was resolved");

    // })

    // .catch(()=>{

    //     console.log("Promise was rejected");

    // });