NodeJS中的动态对象属性名称

Question

我有一个这样的数组：

rules[0] = "a";
rules[1] = "b";
rules[2] = "c";

对象data的值为value-a，value-b，value-c（最后一个字母来自＆＃34;规则＆＃34;。

我知道你可能会建议一个数组，但我真的需要它们作为普通属性。如何创建这些由字符串＆＃34; value - ＆＃34;形成的动态属性名称。和变量的值？

for r in rules {
  data.value-??? = "something";
}

Answer 1

试试这个：

const data = rules.reduce((dict, key) => {
    dict[`value-${key}`] = 'something';
    return dict;
}, {});

Answer 2

您可以使用for ... of语句，该语句使用元素

var rules = ["a", "b", "c"],
    data = {};

for (let r of rules) {
    data['value-' + r] = "something";
}
console.log(data);

或简单Array#forEach

ES6

var rules = ["a", "b", "c"],
    data = {};

rules.forEach(r => data['value-' + r] = "something");
console.log(data);

ES5

var rules = ["a", "b", "c"],
    data = {};

rules.forEach(function (r) {
    data['value-' + r] = "something"
});
console.log(data);

Answer 3

试试这个：

var data = {};
var rules = ['a', 'b', 'c', 'd'];
rules.forEach(function(rule) {
  data['value-'+rule] = "something";
});
console.log(data);