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|
# Async functions
# -----------------
#
# * Async Function Definition
# async function should return a promise
do ->
x = ->>
5
p = x!
# Promise.resolve(p) === p iff x is a promise
# source: http://www.ecma-international.org/ecma-262/6.0/#sec-promise.resolve
eq Promise.resolve(p), p
p.then ->
eq it, 5
# async function as argument
do ->
ok ->> 1
# named async function
ok <| :fn ->> 2
# async function definition
do ->
x = ->>
3
y <- x!then
eq y, 3
# async function with await
do ->
x = ->>
await Promise.resolve(2)
y <- x!then
eq y, 2
# async function with await Promise.all
do ->
x = ->>
await Promise.all [
Promise.resolve(3)
Promise.resolve(4)
]
y <- x!then
eq y.length, 2
eq y[0], 3
eq y[1], 4
# async function calling other async functions
do ->
z = ->>
5
x = ->>
2 + await z()
y <- x!then
eq y, 7
# async function with await in for loop
do ->
z = (x) ->>
Promise.resolve(x * 2)
x = ->>
output = 0
for i from 2 to 5
output += await z(i)
output
y <- x!then
eq y, 28
# async function with await in list comprehension
do ->
x = ->>
[await Promise.resolve(i) for i from 2 til 5]
y <- x!then
eq y.length, 3
eq y[0], 2
eq y[1], 3
eq y[2], 4
# async function awaiting on a callback-based function
do ->
y = (callback) ->
callback(6)
x = ->>
2 + await new Promise ->
y(it)
y <- x!then
eq y, 8
# async functions with do
do ->
y <- (do ->> 9).then
eq y, 9
# nested async functions
do ->
x = ->>
2 + await do ->>
6 + await do ->>
5 + await do ->>
3
y <- x!then
eq y, 16
# async function name(arglist) syntax
do ->
async function x(n, m)
5 + n + m
y <- x(3, 4).then
eq y, 12
# hushed async functions should still return Promises, but they shouldn't be implicitly fulfiled with the value of the body
do ->
x = !->>
5
p = x!
eq Promise.resolve(p), p
p.then ->
eq it, undefined
# curried async function
do ->
x = (n, m) -->>
5 + n + m
y <- x(2)(3).then
eq y, 10
# curried async function used with normal function call syntax
do ->
x = (n, m) -->>
5 + n + m
y <- x(4, 6).then
eq y, 15
# unbound async function
do ->
obj = new
@x = 3
@unbound = ->>
@x
obj2 = x: 5
obj2.unbound = obj.unbound
y <- obj2.unbound!then
eq y, 5
# bound async function
do ->
obj = new
@x = 3
@bound = ~>>
@x
obj2 = x: 5
obj2.bound = obj.bound
y <- obj2.bound!then
eq y, 3
# [LiveScript#1019](https://github.com/gkz/LiveScript/issues/1019)
# in `let` blocks
do ->
x = ->>
let a = Promise.resolve 1
await a
y <- x!then!
eq y, 1
# [LiveScript#1021](https://github.com/gkz/LiveScript/issues/1021)
# in for..let loops
do ->
x = ->>
for let v in [Promise.resolve 1; Promise.resolve 2]
await v
y <- x!then!
eq "#y" '1,2'
# [LiveScript#1023](https://github.com/gkz/LiveScript/issues/1023)
# Loop guards (`when`, `case`, `|`) didn't work with `for..let` loops with `yield` in their bodies
do ->
x = (keys) ->>
pr = Promise~resolve
obj = {a: pr 1; b: pr 2; c: pr 3}
for own let k, v of obj when k in keys
await v
y <- x(<[ a c ]>).then!
eq "#y", '1,3'
|
