javascript - 从现有数组创建一个新数组

Question

这个问题已经有答案了:

Returning only certain properties from an array of objects in Javascript [duplicate] (5 个回答)

已关闭 5 年前。

我有一个像这样的现有数组

"activeSubject": [
        {
            "subject_id": "Class Teacher",
            "subject_name": "Class Teacher",
            "status": "2"
        },
        {
            "subject_id": "Academic Leader (Head)",
            "subject_name": "Academic Leader (Head)",
            "status": "2"
        },
        {
            "subject_id": "15",
            "subject_name": "Physics",
            "status": "2"
        }
    ]

然后我想创建一个新数组，如下所示

"new_subjects": [
        {
            "value": "Class Teacher",
        },
        {
            "value": "Academic Leader (Head)",
        },
        {
            "value": "Physics",
        }
    ]

我已经通过map()尝试过这个方法

var objA = this.state.activeSubject.map(o => ({
          [o]: { value: o.subject_name}
        }))

但它没有给出正确的数组，请帮我解决这个问题

Answer 1

你的map语法很奇怪，我不知道你想做什么，但这应该足够了;)

this.state = {"activeSubject": [
    {
        "subject_id": "Class Teacher",
        "subject_name": "Class Teacher",
        "status": "2"
    },
    {
        "subject_id": "Academic Leader (Head)",
        "subject_name": "Academic Leader (Head)",
        "status": "2"
    },
    {
        "subject_id": "15",
        "subject_name": "Physics",
        "status": "2"
    }
]};

var objA = this.state.activeSubject.map(o => ({ value: o.subject_name}));
console.log(objA);