Here's my attempt at implementing the await and defer features, without modifying the language itself.
await (defer) ->
getUserCredentials defer("loggedIn", "credentials")
, ({loggedIn, credentials}) ->
# use the variables here
await (defer) ->
# Get user credentials IN PARALLEL! (this is a nonsensical example, but it demonstrates paralellism
getUserCredentials defer("userOneLoggedIn", "userOneCredentials")
getUserCredentials defer("userTwoLoggedIn", "userTwoCredentials")
, ({userOneLoggedIn, userTwoLoggedIn, userOneCredentials, userTwoCredentials}) ->
# We have all of the things we set!a slightly shorter syntax, for the case where you only want to wait for one thing
awaitOne (d) -> getUserCredentials d(), (loggedIn, credentials) ->
# use the variables here#Serial Await In order to prevent indentation creep, you can use sawait, which will not start a second await until the first has finished
It returns an await function that will wait for the previously called await function before it goes await = sawait() for i in [0...10] and will take the result of the previous await as the first argument
for name in ["Zach", "Eugene", "Chad", "Brian"]
sawait = serialAwait()
sawait (defer) ->
getIdFromName name defer("id")
sawait ({id}, (defer) ->
getUserImageFromId id, defer "userImage"
getUserPostCountFromId id, defer "postCount"
, ({userImage, postCount, id}) ->
console.log(name + "with id " + id + " looks like " +
userImage + "and has posted" + postCount + "times")npm install mocha should
mocha test/test.coffee
MIT (see LICENSE.txt)
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