let map = fn(f,array) {
  let mut index = 0
  loop {
    if index >= array.len {
      break
    }
    array.index = f(array.index)
    index = index + 1
  }
  array
}

let min = fn(a,b) {
  if a < b {
    a
  } else {
    b
  }
}

let max = fn(a,b) {
  if a < b {
    b
  } else {
    a
  }
}

let abs = fn(a) {
  if a >= 0 { a } else { 0 - a }
}