通过检查多个条件的 Javascript 数组过滤器

Question

我有一个数组:

var arr = 
[
    {
        "id":3,
        "first_name":"Laila",
        "last_name":"McCaine",
        "gender":"female",      
        "populations":[{"population_name":"Heart failure"}, {"population_name":"AMI"}],
        "score": 55.0
    },
    {
        "id":5,     
        "first_name":"Riva",
        "last_name":"Rontgen",
        "gender":"female",
        "populations":[{"population_name":"Pnumonia"}],
        "score": 85.0
    },
    {
        "id":8,
        "first_name":"Emily",   
        "last_name":"Rosewood",
        "gender":"female",  
        "populations":[],
        "score": 25.0
    }
];

和变量:

var score='';
var population='';
var status = '';

我想在 和 条件下使用数组 filter 函数，例如 获取 score 小于 40、status = 1 且 population_name 为“心力衰竭”的记录。

问题是，给定 3 个变量是 dynamic 并且如果其值为 ''，则不应应用 filter。

我怎样才能做到这一点？

Answer 1

像这样:

arr.filter(function(item) {
    var ok = true;

    if (score !== '') {
        ok = item.score < score;
    }

    if (ok && population !== '') {
        // check it
        ok = item.populations.map(function() {return item.population_name;}).indexOf(population) > -1;
    }

    if (ok && status !== '') {
        // check status
    }

    return ok;
});