Promises JS11

hw.js

// task 1

function createOrder(orderId){
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      let rand = Math.random() > 0.3;
      if(rand){ resolve(orderId); }
      else(reject(`Order ${orderId} was not created`));
      console.log("Creating order:" + orderId);
    }, 1000)
  });
}
function processOrder(orderId) {
 return new Promise((resolve, reject) => {
   setTimeout(() => {
     let rand = Math.random() > 0.3;
     if(rand){ resolve(orderId); }
     else(reject(`Order ${orderId} was not processing`));
     console.log(`Processing order ${orderId}`);
   }, 2000)
 });
}
function deliverOrder(orderId){
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      let rand = Math.random() > 0.2;
      if(rand){ resolve(orderId); }
      else(reject(`Order ${orderId} was not delivered`));
      console.log(`Delivering order ${orderId}`);
    }, 3000)
  });
}

createOrder(1)
  .then(processOrder)
  .then(deliverOrder)
  .then((orderId) => {console.log(`Order ${orderId} completed`)})
  .catch((error) => console.log(error));

// task 2
function checkEvenNumbers(number){
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if(typeof number == "number"){
        if(number % 2 === 0){
          resolve(`${number} is even`);
        }else{
          reject(`${number} is odd`);
        }
      }else{
        reject(`Invalid number ${number}`);
      }
    },1000)
  })
}
checkEvenNumbers("sd")
  .then((result) => {console.log(result)})
  .catch((err) => {console.log(err)})

// task 3

function sumArrayAsync(array){
  return new Promise( (resolve, reject) => {
    if(array.length > 0){
      setTimeout(() => {
        let sum = array.reduce((acc, item) => acc + item, 0);
        resolve(sum);
      }, 1000*(array.length));
    }else{
      reject(`Array is empty`);
    }
  })
}

const  main = () =>{
  sumArrayAsync([1,2,4,5])
    .then(result => console.log(result))
    .catch((err) => {console.log(err)})
}
main()