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Start your free trialJasper Kop
10,423 PointsWhy is the text from resolve displayed by the val function?
I don't get the link between the breakfastPromise.then (val=> console.log(val)) and the resolve text that shows up in the console.
I find the whole call-back and promise hard to understand.
3 Answers
Clinton Hays
Front End Web Development Techdegree Graduate 18,156 PointsHi Jasper!
shahzaib rafiq is right on here. val
is just a variable holding the resolve
information. It may be easier to understand if you right it out like this:
const breakfastPromise = new Promise((resolve, reject) => {
setTimeout(() => {
resolve('Your order is ready!');
}, 3000);
});
console.log(breakfastPromise);
breakfastPromise.then((resolve) => console.log(resolve)); // .then() is a method that uses the resolved information from the promise you've previously created
Hope this helps!
shahzaib rafiq
Courses Plus Student 3,001 Pointsfor understanding take the resolve like a message variable which store the success message and .then() is the method which takes one parameter (you can name that parameter whatever you want) and performs the task on that parameter which you pass. Like .then( val => {console.log(val)} ) or .then(msg => {console.log(msg)}) it will print the value that store in resolve.
Alex Hort-Francis
17,074 PointsThis concept of 'automatically provided arguments' seems to explain this: https://gomakethings.com/automatically-provided-arguments-in-javascript-callback-functions/
"With callback functions on JavaScript methods, the arguments are automatically passed in by the method itself."