Promise implementation in Golang
func main() {
t := promise.
New(func(resolve promise.Accept, reject promise.Decline) {
r, err := http.Get("https://google.com")
if err != nil {
reject(err)
return
}
defer r.Body.Close()
b, err := ioutil.ReadAll(r.Body)
if err != nil {
reject(err)
return
}
resolve(b)
}).
Then(func(b []byte) string {
return string(b)
}).
Catch(func(err error) string {
return err.Error()
})
d := t.Result()
fmt.Println("fetch response: ", d) // fetch response: <!doctype html><html itemscope="" itemtype="...
}func main() {
t := promise.
New(func(resolve promise.Accept, reject promise.Decline) {
resolve(2)
}).
Then(func(n int) promise.Promise {
return promise.
Resolve(n).
Then(func(n int) int {
return n + 3
})
})
d := t.Result()
fmt.Println("sum: ", d) // sum: 5
}func main() {
t := promise.
New(func(resolve promise.Accept, reject promise.Decline) {
resolve(1)
}).
Then(func(n int) (int, int, float64, promise.Promise) {
return n, 2, 3.5, promise.Resolve(4.5)
}).
Then(func(a, b int, c, d float64) int {
return int(float64(a) + float64(b) + c + d)
})
d := t.Result()
fmt.Println("total: ", d)
}