[Lemme]

Anton6677, если нужно понять, то:

function sortByAttackType(heroes, attackType) {
	return heroes.filter(function(hero) {
  	return hero.attack_type === attackType;
  });
}

function sortByRole(heroes, role) {
	return heroes.filter(function(hero) {
  	return hero.role === role;
  });
}

var heroes = [
  { name: 'Anti-Mage', role: 'carry', attack_type: 'melee' },
  { name: 'Wraith King', role: 'carry', attack_type: 'melee' },
  { name: 'Tinker', role: 'carry', attack_type: 'ranged' },
  { name: 'Invoker', role: 'carry', attack_type: 'ranged' },
  
  { name: 'Ogre Magi', role: 'support', attack_type: 'melee' },
  { name: 'Abaddon', role: 'support', attack_type: 'melee' },
  { name: 'Crystal Maiden', role: 'support', attack_type: 'ranged' },
  { name: 'Disruptor', role: 'support', attack_type: 'ranged' },
];


var carries       = sortByRole(heroes, 'carry'),
    supports      = sortByRole(heroes, 'support'),
    melee         = sortByAttackType(heroes, 'melee'),
    ranged        = sortByAttackType(heroes, 'ranged'),
    meleeSupports = sortByRole(melee, 'support');

console.log(carries);
console.log(supports);
console.log(melee);
console.log(ranged);
console.log(meleeSupports);