&:JS (trying to apply Ruby to_proc trick to JS)

var λ = function(k){var a=[];while(a.length+1<arguments.length){a.push(arguments[a.length+1])};return function(o){return((o[k]&&o[k]instanceof Function)?o[k].apply(this,a):o[k]);}};

var ary = [
  {num:1, f:function(a,b,c){console.log("A: " + a + "," + b + "," + c);}},
  {num:2, f:function(a,b,c){console.log("B: " + a + "," + b + "," + c);}},
  {num:3, f:function(a,b,c){console.log("C: " + a + "," + b + "," + c);}}
];

ary.forEach(λ('f',1,2,3));
# => A: 1,2,3
# => B: 1,2,3
# => C: 1,2,3

ary.map(λ('num'));
# => [1, 2, 3]

ary.map('num'.λ);

ary.map('num'.toFunction) ?