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Multiple-value in single-value context
source link: https://yourbasic.org/golang/gotcha-multiple-value-single-value-context/
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Multiple-value in single-value context
yourbasic.org/golang
Why does this code give a compile error?
t := time.Parse(time.RFC3339, "2018-04-06T10:49:05Z")
fmt.Println(t)../main.go:9:17: multiple-value time.Parse() in single-value contextAnswer
The time.Parse function returns two values,
a time.Time and
an error, and you must use both.
t, err := time.Parse(time.RFC3339, "2018-04-06T10:49:05Z")
if err != nil {
// TODO: Handle error.
}
fmt.Println(t)2018-04-06 10:49:05 +0000 UTCBlank identifier (underscore)
You can use the blank identifier to ignore unwanted return values.
m := map[string]float64{"pi": 3.1416}
_, exists := m["pi"] // exists == true
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