Discussion on: 5 ways to refactor if/else statements in JS functions

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Replies for: Personally, I'm a little torn on this pattern. It's compact, and I've definitely used it. But, IMHO, it increases the cognitive load of the code, ...

it increases the cognitive load of the code, you now have two places to look for what it's doing

For that reason in some instances I use this:

function foo(arg) {
  return (
    arg === 'a' ? 1 :
    arg === 'b' ? 2 :
    3
  )
}

or this:

function foo(arg) {
  return {
    a:  1,
    b:  2,
  }[arg] || 3
}