Rule proposal: `no-duplicate-loops`

I’ve seen this a couple of times

Error

for (const gamma of bars.map(alpha => alpha.beta.gamma)) {
  gamma('ray')
}
 
for (const act of actions.filter(act => typeof act === 'function')) {
  act('a fool')
}

Pass

for (const alpha of bars) {
  alpha.beta.gamma('ray')
}


for (const act of actions) {
  if (typeof act === 'function') {
    act('a fool')
  }
}

[sindresorhus]

@fisker Because you end up iterating through bars twice.

[sindresorhus]

How about forcing the looped expression to be one of:

That sounds sensible, but wouldn’t that be a completely different rule? This rule is about preventing duplicate iterations.