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ViewsJavascript switch case with multiple expression
I currently attempted to write a switch case taking in 3 variables
switch (user.nameInDB === userInputMobile,
user.phoneInDB === userNumberInputMobile,
user.emailInDB === userInputFrontend) {
case ( true, _, _) :
// Do something
case ( _, true, _) :
// Do something else
case ( _, _, true) :
// Do last thing
default:
break;
}
I have ran into an error where the " _ " is not defined. Any advise on how to organise this?
·
Juan Pablo Isaza
2 answers
Answer question0
If you're only checking for one variable at a time or maybe even more I recommend using If statments instead, It improves code readability and also has better performance than checking for multiple variables that aren't required to checked.
if (user.nameInDB === userInputMobile) {
// do something
}
However, If you wish to use switch statments you could just pass undefined, null or true/false depending on your use case.
·
Juan Pablo Isaza
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As per the doc, switch statement evaluates an expression. So what you are trying to achieve
switch (expression1, expression2, expression3, ...)
Is the wrong way.
If you want to use switch for the same thing, you can use
const _ = false
const expression = [true, false, false].join()
switch(expression){
case [true, _, _].join():
// Do something
case [_, true, _].join():
// Do something
case [_, _, true].join():
// Do something
default:
// Do something
}
·
Juan Pablo Isaza
Report
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