Underscore.js 1.7の使い方 Collections編 defaults

var r = document.getElementById("r");
var data = { name: 'yamada' };
var result = _.defaults(data, {name: 'suzuki', userid: 'i01'});
console.log(result);
// => Object { name: 'yamada', userid: 'i01' }
r.innerHTML = result.name;
// => yamada