7 replies

anonn – 15-18 Oct 10

Hi, I have trouble understanding how promises work in terms of the event loop.

function a() {
    console.log('a')
}

function b() {
  console.log("b");
}

function c() {
  console.log("c")
}

fetch("https://fakelinkabcabc.com").catch(a);

Promise.resolve().then(b);

Promise.reject().catch(c);

function a() {
    console.log('a')
}

function b() {
  console.log("b");
}

function c() {
  console.log("c")
}

fetch("https://fakelinkabcabc.com").catch(a);

Promise.resolve().then(b);

Promise.reject().catch(c);

Why is the output b,c,a

Could someone explain in terms of the event loop? e.g the image attached

What actually happens when the javascript engine reaches

Promise.resolve()

Promise.resolve()

? What actually happens when the

.then(b)

.then(b)

is reached?

I have been unable to find resources that go through step by step how interacting with Promises/Web APIs work in terms of the event loop and would be very happy if someone could point me some resources

anonn – 15-18 Oct 10

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