Discussion on: What The For Loop?

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extract isOdd out and you can now reuse it elsewhere. It also improves the readability of the for loop.

const isOdd = n => n % 2 === 1

for (let i=0; i<=20; i++){
  if (isOdd(i) {
    console.log(i)
  }
}

isOdd should not need to be a function

Ruby has it as a function 😉