Promises

The Tea Ceremony

Think of a JavaScript promise like a traditional Japanese tea ceremony. The ceremony (promise) begins with a pledge to serve tea (resolve a value), but it takes time to prepare. The tea might be served perfectly (fulfilled promise), or there might be an issue, like running out of tea leaves (rejected promise), but you're assured of receiving a clear outcome.

The Promise Of Tea

Await in silence,
Brewing future, cup in hand,
Fulfill or spill—fate.

The Tea Ceremony Promise

// The Tea Ceremony analogy
const teaCeremony = new Promise((resolve, reject) => {
  // Preparing the tea
  let teaReady = true; // Change to false to see rejection
  if(teaReady) {
    resolve("Tea is served."); // Tea prepared successfully
  } else {
    reject("The ceremony cannot proceed."); // An issue occurred
  }
});

// Attending the ceremony
teaCeremony.then((message) => {
  console.log(`Success: ${message}`); // Handling fulfillment
}).catch((error) => {
  console.log(`Error: ${error}`); // Handling rejection
});

Promise

Provisional Response Offering Meticulous Insight into Success or Error

Concept Checking Questions

1. What does the resolve function represent in the tea ceremony analogy?

• Answer: The resolve function represents the successful preparation and serving of the tea, fulfilling the promise of the tea ceremony.

2. What happens if teaReady is set to false?

• Answer: If teaReady is set to false, the promise is rejected, symbolizing the ceremony cannot proceed due to an issue, such as running out of tea leaves.

3. How do .then() and .catch() relate to the ceremony?

• Answer: .then() handles the scenario where the tea is served successfully (fulfillment), and .catch() deals with any issues that prevent the tea from being served (rejection), maintaining the flow of the ceremony regardless of the outcome.