operator.js

var operator = {
  add: function (a, b) {
    return a + b;
  },
  contains: function (a, b) {
    return a in b;
  },
  division: function (a, b) {
    return a / b;
  },
  and: function (a, b) {
    return a & b;
  },
  xor: function (a, b) {
    return a ^ b;
  },
  invert: function (a) {
    return ~ a;
  },
  or: function (a, b) {
    return a | b;
  },
  setitem: function (o, k, v) {
    return o[k] = v;
  },
  delitem: function (o, k) {
    return delete o[k];
  },
  getitem: function (o, k) {
    return o[k];
  },
  lshift: function (a, b) {
    return a << b;
  },
  mod: function (a, b) {
    return a % b;
  },
  mul: function (a, b) {
    return a * b;
  },
  neg: function (a) {
    return - a;
  },
  not: function (a) {
    return ! a;
  },
  rshift: function (a, b) {
    return a >> b;
  },
  sub: function (a, b) {
    return a - b;
  },
  lt: function (a, b) {
    return a < b;
  },
  le: function (a, b) {
    return a <= b;
  },
  eq: function (a, b) {
    return a == b;
  },
  equal: function (a, b) {
    return a === b;
  },
  nequal: function (a, b) {
    return a !== b;
  },
  ne: function (a, b) {
    return a != b;
  },
  ge: function (a, b) {
    return a >= b;
  },
  gt: function (a, b) {
    return a > b;
  },
  land: function (a, b) {
    return a && b;
  },
  lor: function (a, b) {
    return a || b;
  },
  ternary: function (a, b, c) {
    return a ? b : c;
  },
  typeof: function (a) {
    return typeof a;
  },
  instanceof: function (a, b) {
    return a instanceof b;
  },
  new: function (a) {
    var args = Array.slice(arguments, 1);
    return new Function(
      'args',
      'c',
      'return new c(' + args.map(function (_, i) {
        return 'args[' + i + ']';
      }).join(',') + ')')(args, a);
  }
};