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lighthouse-promises's Introduction

lighthouse-promises

** Open the Branches of this Project for all the code **

Promises

  • why we prefer them to callbacks for chaining operations
  • how and why we create them (rarely)
  • how and when we use them (often!)
  • how we chain promises
  • using "catch" and "finally"
  • what a "return" from then() and catch() does
    • Returned item gets pushed onto the "then" stack as a new Promise
    • The returned item does NOT have to be another Promise!
    • Can even be a value or undefined, and its still "thenable"
    • We can use this behavior for some interesting tricks
  • Promise.all() - you can still catch individual promises
  • Remember what the return from a then or catch actually does

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