Determines if an object resembles another object (obj). If x resembles y, then x contains some of y's attributes. xRy => x.keys (subset of) y.keys

resembles.js

// Using func. https://gist.github.com/ryansmith94/5564105
func("resembles", function (obj) {
    var self = this;
    var keys = Object.keys(self);
    var len = keys.length;
    var key = 0;

    return (function check() {
        if (self[keys[key]] === obj[keys[key]]) {
            key += 1;
            return (key <= len) ? check() : true;
        }
        return false;
    }());
}, Object.prototype);

// Test code.
var testResembles = function () {
    var x = {"a": 10, "b": 3};

    if (x.resembles({"a": 10}) !== false) {console.log("Test 1 failed."); }
    if (x.resembles({"a": 10, "b": 4}) !== false) {console.log("Test 2 failed."); }
    if (x.resembles({"a": 10, "b": 3}) !== true) {console.log("Test 3 failed."); }
    if (x.resembles({"a": 10, "b": 3, "c": 1}) !== true) {console.log("Test 4 failed."); }
};