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14. Asynchronous Code in JS

Module 1 · Media Course's Objectives
Module 2 · Media Try catch blocks
Module 3 · Media Synchronous Execution
Module 4 · Mind map Asynchronous Code
Module 5 · Mind map The event loop
Module 6 · Media Callback functions
Module 7 · Media Nested Callbacks
Module 8 · Media Add more rulers
Module 9 · Media Callback Hell
Module 10 · Media Promises
Module 11 · Media The .then() function
Module 12 · Media Chain promises You are here
Module 13 · Media Promisify everything
Module 14 · Media Catching a promise error
Module 15 · Flowchart AJAX Calls
Module 16 · Media The fetch API
Module 17 · Media Working with JSON data
Module 18 · Media Fetch Json
Module 19 · Media Weather Info exercise
Module 20 · Media Async/await
Module 21 · Media Async/Await weather Rewrite
Module 22 · Media Promise.all
Module 23 · Media Make multiple requests at once

Close the course

Module 12 of 23 · Media

Chain promises

Kostas Diakogiannis

Chain promises

Chaining multiple promises

What if we want to still go further and chain more promises? We can chain .then after another promise again. As seen, in line 19 we call the same function (that returns a promise) with the name of Jon Snow, so as we know after 3 seconds the ruler will change to Jon Snow.

Bear in mind: The inner function must return a promise, in order to chain with the .then function afterwards and console the 'Jon Snow' name.