通過檢查多個條件來過濾Javascript數組

Question

我有一個數組：

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
    }
];

和變量：

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

我想使用數組filter功能and條件，如獲取記錄score小於40， status = 1和population_name為“心力衰竭”。

問題是，給定3個變量是dynamic ，如果值為''，則不應該應用filter 。

我怎樣才能做到這一點？

Answer 1

像這樣的東西：

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;
});

Answer 2

 var arr = [ { "id":3, "status": 1, "first_name":"Laila", "last_name":"McCaine", "gender":"female", "populations":[{"population_name":"Heart failure"}, {"population_name":"AMI"}], "score": 55.0 }, { "id":5, "status": 1, "first_name":"Riva", "last_name":"Rontgen", "gender":"female", "populations":[{"population_name":"Pnumonia"}], "score": 85.0 }, { "id":8, "status": 0, "first_name":"Emily", "last_name":"Rosewood", "gender":"female", "populations":[], "score": 25.0 } ]; function filterRecords( arr ){ return arr.filter(function( record ){ return record.score > 40 && record.status && (record.populations.filter(function( population ){ return population.population_name == 'Heart failure'; })).length; }); } console.log( filterRecords( arr ) ); 

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