const dragonEvents = [
    { type: 'attack', value: 12, target: 'player-dorkman' },
    { type: 'yawn', value: 40 },
    { type: 'eat', target: 'horse' },
    { type: 'attack', value: 23, target: 'player-fluffykins' },
    { type: 'attack', value: 12, target: 'player-dorkman' },
  ];

  const reduceToTotal = (p, n) => (p || 0) + n;
  const isAttack = e => e.type === 'attack';

  const totalDamageOnDorkman = dragonEvents
  	.filter(isAttack)
  	.filter(e => e.target === 'player-dorkman')
  	.map(e => e.value)
  	.reduce(reduceToTotal);

  	totalDamageOnDorkman; //24