JavaScript

Promises

const placeOrder = noOfItems =>
  new Promise((resolve, reject) => {
    setTimeout(() => {
      if (noOfItems < 5) reject("Minimum 5 items required.");
      else resolve("Order placed.");
    }, 5000);
  });

placeOrder(10)
  .then(message => {
    console.log(message);
    console.log("Order#1 will be dispatched soon");
    console.log("Order processing completed.");
  })
  .catch(error => {
    console.log(error);
    console.log("Order processing completed.");
  });

placeOrder(2)
  .then(message => {
    console.log(message);
    console.log("Order#2 will be dispatched soon");
    console.log("Order processing completed.");
  })
  .catch(error => {
    console.log(error);
    console.log("Order processing completed.");
  });


const placeOrder = noOfItems =>
  new Promise((resolve, reject) => {
    setTimeout(() => {
      if (noOfItems < 5) reject("Minimum 5 items required.");
      else resolve("Order placed.");
    }, 5000);
  });

placeOrder(10)
  .then(message => {
    console.log(message);
    console.log("Order#1 will be dispatched soon");
  })
  .catch(error => {
    console.log(error);
  })
  .finally(() => {
    console.log("Order processing completed.");
  });

placeOrder(2)
  .then(message => {
    console.log(message);
    console.log("Order#2 will be dispatched soon");
  })
  .catch(error => {
    console.log(error);
  })
  .finally(() => {
    console.log("Order processing completed.");
  });
