Promisees – JavaScript Promises Visualization

by bevacqua • 11 years ago

64 15 11 years ago

iyn• 11 years ago

Promises are better than being stuck in callback hell, but ES7 async functions (async/await) are way better: http://www.sitepoint.com/simplifying-asynchronous-coding-es7...

The best part: you can use it today with babel (I'm using it in browser and on node thanks to the power of webpack, babel and hot reloading).

iamstef2• 11 years ago

I agree, async/await is very nice. Though it is worth pointing out async/await is quite literally syntactic sugar on top of promises. Essentially adding language syntax for common promise idioms.

bluepnume2• 11 years ago

More than just syntactic sugar. async/await changes the whole control flow of a method.

AgentME• 11 years ago

async/await works with promises, it doesn't replace them.

tracker1• 11 years ago

I think it's important to understand this, as when you are interacting with other modules that return promises, you need to know that you can await those, as well as that async functions return promises that can be used as them without being inside another async function.

finalight• 11 years ago

can someone explain to me is ES7 tied to the browser version/type, or usually all the popular browsers support it out of the box?

because I couldn't find any information on that

curun1r• 11 years ago

It's complicated. ES6/7 support isn't binary. But sites like this help: http://caniuse.com/

asutherland• 11 years ago

http://kangax.github.io/compat-table/es6/ and http://kangax.github.io/compat-table/es7/ are particularly good for ES since it breaks out things into the nitty gritty features, providing the code samples that are tested.

callahad3• 11 years ago

Like other web standards, these things tend to get implemented in a piecemeal fashion according to consensus and demand. By the time the standards are published, much of their content is already implemented in modern browsers.

For example, the ES6 spec was just published a few months ago, so it will still be a year before we see ES7. In spite of that, the async / await capabilities are sufficiently compelling and agreed upon that patches are already being reviewed for Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1185106

Kangax's tables, linked in another reply, are a great way to check what the support situation is like across browsers.

Promisees – JavaScript Promises Visualization

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