Split a number into parts that sums back to its own

SplitNumber.js

function splitNumber(n, m_parts){
  var arr = [];
  var eachPart = Math.ceil(n / m_parts);
  for(var i = 0; i < m_parts; i++){
    arr.push(eachPart);
  }
  var diff = (eachPart * m_parts) - n;
  for(var i = 0; i < diff; i++){
    arr[i%arr.length]--;
  }
  return arr.reverse();
}