no-new-wrappers

禁止带有 String、Number 和 Boolean 对象的 new 运算符

JavaScript 中有三种具有包装对象的原始类型：字符串、数字和布尔值。它们分别由构造函数 String、Number 和 Boolean 表示。每当读取这些原始值之一时都会使用原始包装器类型，从而为它们提供类似对象的功能，例如方法。在幕后，相关包装类型的对象被创建然后销毁，这就是为什么您可以调用原始值的方法，例如：

var text = "Hello world".substring(2);

在本示例的幕后，构造了一个 String 对象。substring() 方法存在于 String.prototype 上，因此字符串实例可以访问。

也可以手动创建一个新的包装器实例：

var stringObject = new String("Hello world");
var numberObject = new Number(33);
var booleanObject = new Boolean(false);

尽管可能，但没有任何充分的理由将这些原始包装器用作构造函数。它们比其他任何东西都更容易使其他开发人员感到困惑，因为它们似乎应该充当原语，但实际上并非如此。例如：

var stringObject = new String("Hello world");
console.log(typeof stringObject);       // "object"

var text = "Hello world";
console.log(typeof text);               // "string"

var booleanObject = new Boolean(false);
if (booleanObject) {    // all objects are truthy!
    console.log("This executes");
}

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规则详情

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/*eslint no-new-wrappers: "error"*/

var stringObject = new String("Hello world");
var numberObject = new Number(33);
var booleanObject = new Boolean(false);

var stringObject = new String;
var numberObject = new Number;
var booleanObject = new Boolean;

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/*eslint no-new-wrappers: "error"*/

var text = String(someValue);
var num = Number(someValue);

var object = new MyString();

何时不使用

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