where: create a matching predicate from an object

where.js

function where(matchThis) { 
  var keys = Object.keys(matchThis); 
  return function(testObj) { 
      var match = ramda.all(function(key) { 
        return testObj[key] === matchThis[key]; 
      }, keys); 
      return match ? testObj : false; 
    }; 
}

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


function whereWith(rel, matchThis) {
  var keys = Object.keys(matchThis); 
    return function(testObj) { 
      var match = ramda.all(function(key) { 
        return rel(testObj[key], matchThis[key]); 
      }, keys); 
      return match ? testObj : false; 
    }; 
}

xlt1 = whereWith(function(test, match) { return test < match; }, {x: 1});

xlt1({x: 1}); // false
xlt1({x: 0}); // Object {x: 0}