I change my mind about it fairly frequently in practice, but in theory my thinking is the following: verb prefixes imply predicates or instructions, which means it should be a function (or a toggle flag). That said, booleans are tricky - it never quite "feels" right to have an unprefixed variable representing a boolean. validResponse is the valid response, right? Oh, wait.
This is true, could be the valid response as well. I think this level of ambiguity might not be problem, it happens quite often in code. I would argue it’s not the job of the variable name to tell me its type.
There is still the issue with naming the result when the function has the name already:
const nameMe = isValidResponse(response);
One idea would be to name it responseIsValid. I still prefer responseValid if the context allows for it.
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I change my mind about it fairly frequently in practice, but in theory my thinking is the following: verb prefixes imply predicates or instructions, which means it should be a function (or a toggle flag). That said, booleans are tricky - it never quite "feels" right to have an unprefixed variable representing a boolean.
validResponseis the valid response, right? Oh, wait.This is true, could be the valid response as well. I think this level of ambiguity might not be problem, it happens quite often in code. I would argue it’s not the job of the variable name to tell me its type.
There is still the issue with naming the result when the function has the name already:
One idea would be to name it
responseIsValid. I still prefer responseValid if the context allows for it.