How to skip values ​​in slice if condition is matched first time

php editor Banana will introduce to you how to skip the value of the first matching condition in the slice. During development, we often need to deal with slices of arrays or strings, but sometimes we want to skip the first value in the slice that meets a specific condition. This may be because we only care about subsequent matches, or we only need to process values ​​after a specific position. Next, we'll explore several solutions to help you achieve this goal.

Question content

How to skip values ​​in a slice if the condition matches once.

func main() {

    cloud := []string{"moon", "earth", "moon-light"}

    for _, value := range cloud {

        if strings.Contains(value, "mo") {
            fmt.Println("print1")
        } else if strings.Contains(value, "ear") {
            fmt.Println("print2")
        }
    }
}

Output: print 1 Print 2 Print 1

Expected output: print 1 Print 2

Thanks!

Solution

You can use the map to find out if a specific situation occurs. It's better than using variables because it allows you to track a large number of conditions without causing any confusion. Here is an example of what you want:

cloud := []string{"moon", "earth", "moon-light"}
var conditionTracker = make(map[string]bool)

for _, value := range cloud {

    if _, ok := conditionTracker["first_condition"]; !ok && strings.Contains(value, "mo") {
        conditionTracker["first_condition"] = true
        fmt.Println("print1")
    } else if _, ok := conditionTracker["second_condition"]; !ok && strings.Contains(value, "ear") {
        conditionTracker["second_condition"] = true
        fmt.Println("print2")
    }
}

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