Proposal: add block level lambda ~> operator to CoffeeScript to hackishly achieve block level lambda functionality in pre ES6 Javascript. An example of block level lambdas is returning a value from within a .each loop in Ruby. See below.

newoperator.coffee

findTheThingWeWant = (things) ->
  things.each (thing) ~>
    return item if thing.isWhatWeWant

newoperator.js

var _CSBlockReturn, findTheThingWeWant;
// Generated due to use of ~>
_CSBlockReturn = (function() {
  _CSBlockReturn.name = '_CSBlockReturn';
  function _CSBlockReturn(value) {
    this.value = value;
  }
  return _CSBlockReturn;
})();

findTheThingWeWant = function(things) {
  try {
    things.each(function() {
      if(thing.isWhatWeWant) {
        throw new _CSBlockReturn(thing);
      }
    })
  } catch(e) {
    if(e.constructor === _CSBlockReturn) {
      return e.value;
    }
    else
    {
      throw e;
    }
  }
}