$ npm install --save object-visit

var visit = require('object-visit');

var ctx = {
  data: {},
  set: function (key, value) {
    if (typeof key === 'object') {
      visit(ctx, 'set', key);
    } else {
      ctx.data[key] = value;
    }
  }
};

ctx.set('a', 'a');
ctx.set('b', 'b');
ctx.set('c', 'c');
ctx.set({d: {e: 'f'}});

console.log(ctx.data);
//=> {a: 'a', b: 'b', c: 'c', d: { e: 'f' }};

$ npm install -g verbose/verb#dev verb-generate-readme && verb

$ npm install && npm test