英文:
Detecting State Change for a variable
问题
我正在编写一段代码，根据阈值检测状态变化。主要目标是只在状态变化时从函数中获取返回值。以下是我目前编写的代码。如果变量的状态没有改变，我们目前会在函数的返回值中返回一个空字符串""。有没有办法在状态不变时抑制返回值，而不是返回一个空字符串？
func (f *stateChange) Exec(args []interface{}, _ api.FunctionContext) (interface{}, bool) {
m1 := args[0]
m2 := m1.([]interface{})
valarray := []float64{}
for _, v := range m2 {
valarray = append(valarray, v.(float64))
}
firstval := valarray[0]
secondval := valarray[1]
message1 := "Medium Level Alarm"
message2 := "High Level Alarm"
message3 := "Normal Operation"
message4 := "" //**空字符串**
if secondval >= 50 && secondval < 100 && firstval < 50{
return message1, true
}
if firstval >= 100 && secondval < 100 && secondval >= 50{
return message1, true
}
if secondval >= 100 && firstval < 100{
return message2, true
}
if firstval >= 50 && secondval < 50 {
return message3, true
}
return message4, true //**需要抑制此输出中的空字符串**
}
英文:
I am writing a code to detect state change based on a threshold value. Main goal is to get a return value from the function only when the state changes. Here is the code I have written so far. If the state of variable does not change currently we are returning "" empty string in the return value of the function. Is there a way that we can suppress the return value if the state does not changes, instead of returning "" (empty string)
`
func (f *stateChange) Exec(args []interface{}, _ api.FunctionContext) (interface{}, bool) {
m1 := args[0]
m2 := m1.([]interface{})
valarray := []float64{}
for _, v := range m2 {
valarray = append(valarray, v.(float64))
}
firstval := valarray[0]
secondval := valarray[1]
message1 := "Medium Level Alarm"
message2 := "High Level Alarm"
message3 := "Normal Operation"
message4 := "" //**empty string**
if secondval >= 50 && secondval < 100 && firstval < 50{
return message1, true
}
if firstval >= 100 && secondval < 100 && secondval >= 50{
return message1, true
}
if secondval >= 100 && firstval < 100{
return message2, true
}
if firstval >= 50 && secondval < 50 {
return message3, true
}
return message4, true //**empty string in return need to suppress this output**
}
`
答案1
得分: 1
抑制此输出的最佳方法是使用 nil。
return nil, true
英文:
The best way to suppress this output is using nil.
return nil, true
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论