array.reduce

[sminnee]

Let's add a companion to array.map and we can bask in our functional goodness.

main {
  square = (x) => x*x;
  sum = (x) => x+x;
  sumSquares = a => a.map(square).reduce(sum);
  puts(sumSquares([1,2,3])); // 14
}

Ideally, the output of map can be piped into reduce without first creating an intermediary array, so that the compiled code is more of this form:

sumSquares(a) {
  for(i in a) {
    mapped = i*i;
    reduced = reduced+mapped;
  }
  return reduced;
}