adding in context with with

[weepy]

This has been discussed before, but I was playing around with the following which might be a way of getting access to a current context. It's made possible by the fact that CoffeeScript will declare all variables on a scope. So instead, we can define them on an object 'context'

(function() {
  var context = {x: null, y: null, X: null}
  var x = 5
  var z = 1234
  with(context) {
    x = 1
    y = 1
    X = {a:3}
    
    // mixin
    for(var i in X)
      context[i] = X[i]
    
    console.log(context)   // #object ...
    console.log(x)         // 1 
    console.log(z)         // 1234 
    console.log(typeof h)  // undefined
    console.log(a)         // 3
  }
})()

Anyway - I'm not entirely sure if it's useful beyond mixing into the current scope, but I thought I'd share it anyway. I imagine that it wouldn't be used unless the script specifically mentioned some kind of 'global' keyword.

[noonat]

Other arguments aside, the with statement is not allowed in strict mode ES5, so I'm not sure this is advisable.

[jashkenas]

Yep, you can certainly make dynamic local variables by using with or eval, but as we've discussed before, neither of those are practical options for reasons of both performance and standards-compliance.

Closing as a wontfix. Just to make my personal position clear, I can't imagine a situation in which I'd be in favor of a CoffeeScript feature that depended on with or eval, nor would I be comfortable using a JS library of any kind that depended on them heavily.