Simple non-curried lens combinators assuming a single variadic accessor.

NonCurriedVariadicAccessorLenses.js

    var a = 1,

    l = proxy(console.log,console),    
    data = { a: { d: 1,b: { c: 3,e: 4 } } },
    att = curry(function (a,o,v) {
      //the following should also work
      //return o[a] = v || o[a];
      return v ? (o[a] = v) : o[a];
    },2),
    id = function (x) { return x; },
    a = function(fn) {
      return function (acc,o) {
        return fn(att('a'),acc(o));
      };
    },
    b = function(fn) {
      return function (acc,o) {
        return fn(att('b'),acc(o));
      };
    },
    c = function(fn) {
      return function (acc,o) {
        return fn(att('c'),acc(o));
      };
    },
    get = function () {
      return function (acc,o) {
        return acc(o);
      }
    },
    set = function (v) {
      return function (acc,o) {
        return acc(o,v);
      };
    },
    mod = function (modifier) {
      return function (acc,o) {        
        return acc(o,modifier(acc(o)));
      };
    },
    add = curry(function (a,b) {
      return a + b;
    }),
    composer = curry(compose,2),
    blur = composer(mod),

    z = 26;

    l('-----------------------------------------------------');
    var result = compose(a,b,c)(blur(add)(999))(id,data);    
    l('result: ' + result);
    l('data: ',data);
    l('-----------------------------------------------------');