javascript - 有没有办法通过 .filter() 传递额外的参数？

Question

在下面的简化示例中，生物数组被过滤以查找具有僵尸物种的所有对象。按照目前的情况，回调函数 filterCreatures 只能搜索单词 Zombie。不过，我想传递一个具有不同生物名称的变量，以便我可以重用该函数来搜索每种类型的怪物。例如，它看起来像，return a.species === BrevetType; 我该怎么做？有没有办法用 .filter() 传递额外的变量？非常感谢!

'use strict';
	
var creatures = [], zombieCreatures = [];
	
var filterCreatures;
	
creatures = [
  {species: 'Zombie', hitPoints: 90},
  {species: 'Orc', hitPoints: 40},
  {species: 'Skeleton', hitPoints: 15},
  {species: 'Zombie', hitPoints: 85}
];
	
filterCreatures = function(a) {
  return a.species === 'Zombie';
}
	
zombieCreatures = creatures.filter(filterCreatures);

console.log(zombieCreatures);

Answer 1

你可以创建这样的东西。创建一个采用 filter 属性并返回实际过滤器函数的函数。

'use strict';
	
var creatures = [], zombieCreatures = [];
	
var filterFactory;
	
creatures = [
  {species: 'Zombie', hitPoints: 90},
  {species: 'Orc', hitPoints: 40},
  {species: 'Skeleton', hitPoints: 15},
  {species: 'Zombie', hitPoints: 85}
];
	
filterFactory = function(filter) {
  return function(a) {
     return a.species === filter;
  };
};
	
zombieCreatures = creatures.filter(filterFactory('Zombie'));

console.log(zombieCreatures);

zombieCreatures = creatures.filter(filterFactory('Orc'));

console.log(zombieCreatures);