我可以从R jupyter笔记本中调用自定义javascript吗 [英] Can I call custom javascript from an R jupyter notebook

问题描述

我有一个使用R编程语言的Jupyter Notebook.我想在此R笔记本中调用javascript functions.

I have a Jupyter Notebook which is using the R programming language. I would like to call javascript functions within this R notebook.

我知道有一种方法可以执行此操作，因为可以从R调用基于javascript的库，但是我找不到包装javascript函数的任何示例，因此R可以使用它.

I know there is a way to do this, because there are javascript based libraries that you can call from R, but I cannot find any examples of wrapping a javascript function, so it can be used by R.

即使是将javascript分配给R variable然后调用该R变量的示例，也会很有帮助.

Even an example of assigning javascript to a R variable and then calling that R variable would be helpful.

推荐答案

js::js_eval()可以在R中评估JavaScript字符串.来自?js::js_eval:

js::js_eval() can evaluate a string of JavaScript within R. From ?js::js_eval:

# Stateless evaluation
js_eval("(function() {return 'foo'})()")

要执行更复杂的JavaScript操作，请检出V8，它可以使一个JavaScript实例保留多行.来自?V8::v8:

For more complicated JavaScript operations, check out V8, which lets you keep a JavaScript instance for more than one line. From ?V8::v8:

# Create a new context
ctx <- v8();

# Evaluate some code
ctx$eval("var foo = 123")
ctx$eval("var bar = 456")
ctx$eval("foo+bar")

最终，除了小小的黑客攻击之外，其他任何事情都将使它感到非常沮丧，但是它确实可以工作.如果您很聪明，您可能会采购整个脚本，但是除非有绝对可以在JavaScript中完成的工作，否则我不确定这样做是否值得.骇客骇客！

Ultimately it's going to get really frustrating for anything beyond little hacks, but it does work. You could likely source a whole script if you're clever, but I'm not sure it's worth it unless there's something that can absolutely only be done in JavaScript. Happy hacking!

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