LiveScript: language design?

getLiveScriptOperator.js

// Re. the LiveScript <-! operator (et al)
// http://gkz.github.com/LiveScript/

function getLiveScriptOperator() {
  var op = '';
  for (var i = 0; i < 3; i++) {
    op += String.fromCharCode(33 + Math.floor(15 * Math.random()));
  }
  return op;
}

Hey @qfox, yes it is a joke. It is an exercise in code golf to see what is the shortest definition.

An explanation of:

[String.fromCharCode 33 + floor 15 * Math.random! for i to 2] * ''

First,

[String.fromCharCode 33 + floor 15 * Math.random! for i to 2]

is a list comprehension. It is an expression which evaluate to a list. It is equivalent to:

result = []
for i to 2
    result.push String.fromCharCode 33 + floor 15 * Math.random!
result

As the from parameter is omitted in the for loop, it is assumed to be 0. to means to and including that number, use til to mean up until (but not including) that number.

[...] * ''

simply means

[...].join('')

@michaelficarra (do) works too, plus you can change your <| with a , here.
My version also is shorter: '-!+'