是否可以在JavaScript中创建自定义运算符？ [英] Is it possible to create custom operators in JavaScript?

问题描述

在Math课程中，我们学习了如何定义新的运算符。例如：

During the Math classes we learned how to define new operators. For example:

这定义了∘法律。对于任何实数 x 和 y ，x∘y是 x + 2y 。

This defines ∘ law. For any real numbers x and y, x ∘ y is x + 2y.

示例：2∘2= 2 + 4 = 6 。

可以在JavaScript中定义这样的运算符吗？我知道函数可以完成这项任务：

Is possible to define operators like this in JavaScript? I know that a function would do the job:

function foo (x, y) { return x + 2 * y; }

但我希望使用以下语法：

but I would like to have the following syntax:

var y = 2 ∘ 2; // returns 6

而不是：

var y = foo(2, 2);

这个问题最接近的解决方案是什么？

Which is the closest solution to this question?

推荐答案

简短的回答是否定的。 ECMAScript（标准JS基于）不支持运算符重载。

The short answer is no. ECMAScript (the standard JS is based on) does not support operator overloading.

另外，在ECMAScript 7中，您将能够重载子集设计自定义值类型时的标准运算符。这是一个关于这个主题的由语言创建者和Mozilla CTO Brendan Eich组成的幻灯片。但是，这不允许任意操作符，并且重载的含义只会应用于值类型。< - 哈哈最终没有发生。

As an aside, in ECMAScript 7, you'll be able to overload a subset of the standard operators when designing custom value types. Here is a slide deck by language creator and Mozilla CTO Brendan Eich about the subject. This won't allow arbitary operators, however, and the overloaded meaning will only be applied to value types. <- haha that ended up not happening.

可以使用 sweet.js 等第三方工具添加自定义运算符，但这需要额外的编译一步。

It is possible to use third party tools like sweet.js to add custom operators though that'd require an extra compilation step.

我 使用esprima回答了来自外部JavaScript的解决方案 - 这是更改 JavaScript并扩展它，它不是原生的。

I've answered with a solution from outside JavaScript using esprima - this is changing JavaScript and extending it, it's not native.

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