halving.js

'use strict'

var BASE_REWARD = 10000000000;
function getReward(height, interval) {

  const halvings = Math.floor(height / interval);

  // BIP 42 (well, our own version of it,
  // since we can only handle 32 bit shifts).
  // https://github.com/bitcoin/bips/blob/master/bip-0042.mediawiki
  if (halvings >= 34)
    return 0;

  // We need to shift right by `halvings`,
  // but 50 btc is a 33 bit number, so we
  // cheat. We only start halving once the
  // halvings are at least 1.
  if (halvings === 0)
    return BASE_REWARD;

  let rewardValue = BASE_REWARD;

  for (let i = 0; i < halvings; i++){
    rewardValue /= 2;
  }

  return rewardValue;
};

var height = 1;
var interval = 150;
for (var i = 0; i < 36; i++) {
  console.log("Height: " + height + " || Halvings: " + Math.floor(height / interval) + " || Reward: " + getReward(height, interval))
  height+=150;
}