在GO中将字符串解析为具有常见错误消息的不同类型[重复]

Question

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• Go Error Handling Techniques [closed] 11 answers

I want parse []string values into particular types (e.g. int, float etc), so I must use different parse functions for different lines. My code:

value, err := strconv.Atoi(line[1])
value1, err := strconv.ParseFloat(line[4], 6)
value2, err := strconv.ParseFloat(line[5], 6)
value3, err := strconv.Atoi(line[2])

I must be sure that every value was parsed so for every value I must have err != nil. Is there any approach to make it with one common error without

if err != nil {
 return 
}

after each line?

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Answer 1

You can use fmt.Sscanf do do this with one error check:

package main

import (
    "fmt"
)

func main() {
    var i int
    var j float64
    var k int
    if _, err := fmt.Sscanf("1,3.14,5", "%d,%f,%d", &i, &j, &k); err != nil {
        panic(err)
    }
    fmt.Println(i, j, k)
}

You'll need to join the lines with some separator but that's trivial.

Also, there's a discussion about making handling of multiple errors nicer for Go 2, I'm not sure what the status of it is at the moment, but you can read about it here: https://go.googlesource.com/proposal/+/master/design/go2draft-error-handling-overview.md