减少数组的键值

Question

我有一个类似

的数组

var myArray = [{ques: 1, ans: "A"}, 
               {ques: 2, ans: "D"}, 
               {ques: 3, ans: "C"}];

我想将其转换为新数组，如：

var newArray= [{1: "A"}, {2: "D"}, {3: "C"}]

请帮助我实现它。

更新 我意识到使用newArray真的很难。很多！ 将它转换为

是有意义的

var newArray=[1: "A", 2: "D", 3: "C"]

请帮助我。

Answer 1

Array.prototype.map()函数应该完成这项工作：

var myArray = [{ques: 1, ans: "A"}, {ques: 2, ans: "D"}, {ques: 3, ans: "C"}],
    newArr = myArray.map(function (o) {
        var newObj = {};
        newObj[o.ques] = o.ans;
        return newObj;
    });

console.log(newArr);

Answer 2

使用map功能

const mappedArr = myArray.map(elem => {
    return {[elem.ques] : elem.ans};
})

Answer 3

您可以将Array#map与computed property一起使用。

var myArray = [{ ques: 1, ans: "A" }, { ques: 2, ans: "D" }, { ques: 3, ans: "C" }], 
    newArray = myArray.map(a => ({ [a.ques]: a.ans }));

console.log(newArray);

Answer 4

使用map转换数组的每个元素：

var myArray = [ {ques: 1, ans: "A"}, 
                {ques: 2, ans: "D"}, 
                {ques: 3, ans: "C"}];

var newArray = myArray.map(function(it) { 
    var ret = {};
    ret[it.ques] = it.ans;
    return ret; 
});