如何使用JavaScript在forEach循環中過濾結果

Question

我很難弄清楚如何遍歷數組，並且僅在找到特定值時才做某事。

任何幫助是極大的贊賞。

我的想法：

ForEach Entry, Where X = Y {
 console.log('I did something');
}

實際數據：

[{
    "id" : 0,
    "fullName" : "George",
    "email": "george@test.ca",
    "group": 'Faculty',
    "totalFiles": 12,
    "outstandingFiles": 10,

},
{
    "id" : 1,
    "fullName" : "Albert",
    "email": "albert@test.ca",
    "group": 'Student',
    "totalFiles": 15,
    "outstandingFiles": 8,
}];

Answer 1

不使用foreach篩選值的方法有很多，您可以使用find將返回第一個匹配值

 var myArray = [{ "id" : 0, "fullName" : "George", "email": "george@test.ca", "group": 'Faculty', "totalFiles": 12, "outstandingFiles": 10, }, { "id" : 1, "fullName" : "Albert", "email": "albert@test.ca", "group": 'Student', "totalFiles": 15, "outstandingFiles": 8, }]; var result = myArray.find(t=>t.group =='Faculty'); console.log(result); 

編輯

 var myArray = [{ "id" : 0, "fullName" : "George", "email": "george@test.ca", "group": 'Faculty', "totalFiles": 12, "outstandingFiles": 10, }, { "id" : 1, "fullName" : "Albert", "email": "albert@test.ca", "group": 'Student', "totalFiles": 15, "outstandingFiles": 8, }]; myArray.filter(t=>t.group =='Faculty').forEach(result => console.log(result)); 

Answer 2

您可以使用過濾器 ，如果你想了許多成果或發現 ，如果你想第一個結果查詢

這是使用過濾器的示例

const data = [
    {
        "id" : 0,
        "fullName" : "George",
        "email": "george@test.ca",
        "group": 'Faculty',
        "totalFiles": 12,
        "outstandingFiles": 10,
    },{
        "id" : 1,
        "fullName" : "Albert",
        "email": "albert@test.ca",
        "group": 'Student',
        "totalFiles": 15,
        "outstandingFiles": 8,
    }
];

const result = data.filter(info => {
    return info.group === 'Faculty'
})

console.log(result)將輸出

[ { id: 0,
    fullName: 'George',
    email: 'george@test.ca',
    group: 'Faculty',
    totalFiles: 12,
    outstandingFiles: 10 } ]

您可以在http://javascript.info/array-methods中了解此方法以及更多數組方法