Codaconda

const fillArray = count => 
  (new Array(count)).fill(1).map((item, i) => i + 1)

const fooBar = array =>
  array.map(number => 
    !(number % 3) && !(number % 5) 
    ? "FooBar"
    : !(number % 3) ? "Foo"
    : !(number % 5) ? "Bar" : number
  )

fooBar(fillArray(100))