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Use the strings.HasPrefix function in golang to determine whether a string begins with a certain prefix
In golang, the strings.HasPrefix function can help us determine a string Whether to start with the specified prefix. I often use this function at work to determine whether a file path meets the requirements. The following is the specific usage and code example of this function.
Function introduction
Function name: HasPrefix
Function function: Determine whether the string s starts with prefix
Function parameters: s string - the string to be judged; prefix string - Prefix string
Function return value: bool - whether the string s begins with prefix
Function code example
The following is a sample code using this function:
package main
import (
"fmt" "strings"
)
func main(){
str1 := "/usr/local/go/bin/go" str2 := "/usr/local/go/src" api1 := "/api/v1/user" api2 := "/api/v2/user" // 判断str1是否以指定的前缀"/usr"开头 if strings.HasPrefix(str1, "/usr"){ fmt.Printf("str1以/usr开头
")
} else { fmt.Printf("str1不以/usr开头
")
} // 判断str2是否以指定的前缀"/usr"开头 if strings.HasPrefix(str2, "/usr"){ fmt.Printf("str2以/usr开头
")
} else { fmt.Printf("str2不以/usr开头
")
} // 判断api1是否以指定的前缀"/api/v1"开头 if strings.HasPrefix(api1, "/api/v1"){ fmt.Printf("api1以/api/v1开头
")
} else { fmt.Printf("api1不以/api/v1开头
")
} // 判断api2是否以指定的前缀"/api/v1"开头 if strings.HasPrefix(api2, "/api/v1"){ fmt.Printf("api2以/api/v1开头
")
} else { fmt.Printf("api2不以/api/v1开头
")
}
}
Output result:
str1 starts with /usr
str2 starts with /usr
api1 starts with /api/v1
api2 Not starting with /api/v1
As you can see from the output, the strings.HasPrefix function can easily determine whether a string starts with the specified prefix. In actual work, we can use this function flexibly according to business needs, thereby improving the readability and execution efficiency of the code.
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