Message from JavaScript discussions

April 2017

— I was referring to just the plain jane js promises which differ a few ways


Lmao, I tried this, and it blocked right away.

new Promise((resolve, reject) => {
setTimeout(() => console.log('Time is out'), 100)

— Nothig showed up

— Yes, a promise is for deferred execution, it is supposed to yield to the next highest execution context

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— And your promise does nothing

— Yeah, it does nothing but I'm trying to understand where it is executed.

— Read about continuation monads


new Promise(function (res, rej) {
console.log("I run right away");
res("I run after everything");
}).then(function (data) {
console.log("I run after");

VM361:2 I run right away
VM361:7 I run after
VM361:5 I run after everything

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— So, it always block.

— And its better no to use Sync versions

— The promise is created, runs it's callback, then yields to next highest context. then is run after resolve is run but only after that next highest context is finished

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— There is not new Promise alternative pattern