Created
July 4, 2019 08:16
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[go switch] go switch #go #switch
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// 条件在 case 中 | |
func unhex(c byte) byte { | |
switch { | |
case '0' <= c && c <= '9': | |
return c - '0' | |
case 'a' <= c && c <= 'f': | |
return c - 'a' + 10 | |
case 'A' <= c && c <= 'F': | |
return c - 'A' + 10 | |
} | |
return 0 | |
} | |
// 根据 case 值判断 | |
func shouldEscape(c byte) bool { | |
switch c { | |
case ' ', '?', '&', '=', '#', '+', '%': | |
return true | |
} | |
return false | |
} | |
// 类型判断 | |
var t interface{} | |
t = functionOfSomeType() | |
switch t := t.(type) { | |
default: | |
fmt.Printf("unexpected type %T\n", t) // %T prints whatever type t has | |
case bool: | |
fmt.Printf("boolean %t\n", t) // t has type bool | |
case int: | |
fmt.Printf("integer %d\n", t) // t has type int | |
case *bool: | |
fmt.Printf("pointer to boolean %t\n", *t) // t has type *bool | |
case *int: | |
fmt.Printf("pointer to integer %d\n", *t) // t has type *int | |
} |
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