calling eval() in particular context

Question

I have following javaScript \"class\":

A = (function() {
   a = function() { eval(...) };
   A.prototype.b = function(arg1, arg2) { /* do something... */};
}         


        

Answer 1

What worked for me was using Function constructor and calling it in specified context:

var o = {
  x: 10
}

(new Function(`console.log(this.x)`)).call(o);

This somehow doesn't work in browser's console but works elsewhere.

Answer 2

You can use my library https://github.com/marverix/meval .

const meval = require('meval');

console.log(
  meval('item.a + item.b * 5', { item: { a: 2, b: 3 } })
);

// outputs: 17