where.js

var where = curry(function where(matchThis, testObj) {
    return ramda.all(function (key) {
        var val = matchThis[key];
        return typeof val == "function" ? val(testObj[key], testObj) :
                                        (testObj[key] === matchThis[key]);
    }, Object.keys(matchThis));
});

x1y2 = where({x: 1, y: 2});
x1y2({x: 1}); //=> false
x1y2({x: 1, y: 2}); //=> true
x1y2({x: 1, y: 2, z: 3}); //=> true

xlt1 = where({x: function(val) {return val < 1;}});
xlt1({x: 1}); //=> false
xlt1({x: 0}); //=> true

triangle = where({
    a: function(a, obj) {return a < obj.b + obj.c;},
    b: function(b, obj) {return b < obj.a + obj.c;},
    c: function(c, obj) {return c < obj.a + obj.b;}
});

triangle({a: 3, b: 4, c: 5}); //=> true;
triangle({a: 6, b: 8, c: 9}); //=> true;
triangle({a: 2, b: 8, c: 12}); //=> false;
triangle({a: 3, b: 11, c: 5}); //=> false;