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Comment by wglb | Hacker News Reader

I am curious what you mean about "easily manipulate environments" for the functions to be evaluated in.

Probably, something similar to JavaScript's call() and apply() is meant here.

Though classical Lisps all have funcall and apply (not sure about Arc).

call and apply only let you change the meaning of the this pointer in Javascript. You can't change the meaning of other bound variables. In Io, you can take a Block and set the scope:

  makeOriginalScope := block(name := "originalScope"; block(writeln(name)))
  block(name := "newScope"; makeOriginalScope call  setScope(thisContext) call) call
  //newScope

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