Promise: promise.catch()

catch() returns a Promise and deals with rejected cases only

prerequisites for understanding

• return a fulfilled promise, to pass a test
• reminder: the test passes when a fulfilled promise is returned

catch method basics

• is an instance method
• catches only promise rejections
• returns a new promise
• converts it`s return value into a promise
• the first parameter is the rejection reason

multiple catches

• only the first catch is called
• if a catch throws, the next catch catches it

Links

mdn docs A short description of how `catch` works.
spec The actual chapter about `catch`, you need to dive in from here.
spec The description of the actual flow of `catch`.