Haskell - hgsk @ ウィキ

Haskell

評価戦略

先行評価(JavaScript)

var ELSE = 0;
(function(a, b, c){
  return a ? b : c;
})(true, 1, ELSE=1+1);
ELSE;    // 2
 

遅延評価(JavaScript)

var myif = function(_cond, _then, _else){
  return _cond() ? _then() : _else();
};
var fact = function(n){
  return myif(function(){ return n <= 1 },
              function(){ return 1 },
              function(){ return n * fact(n-1) });
}
fact(10);
 

http://blog.livedoor.jp/dankogai/archives/50996734.html