Rule Request: avoid if-not-else

[guilhermearaujo]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Rule Request

1. Proposal: when an if statement includes the else clause, the if clause should not be negated. The same applies to the ternary operator.

2. Examples:

// Would trigger:
  if !test {
    methodA()
  } else {
    methodB()
  }

  if !(testA || testB) {
    methodA()
  } else {
    methodB()
  }

  !test ? methodA() : methodB()

// Would not trigger:
  if test {
    methodB()
  } else {
    methodA()
  }

  if testA || testB {
    methodB()
  } else {
    methodA()
  }

  if test ? methodB() : methodA()

3. Should the rule be configurable, if so what parameters should be configurable?
   Not that I can think of.

4. Should the rule be opt-in or enabled by default? Why?
   I, personally, would say yes, as if one is handling both possibilities, there is no need to do it with inverted logic.