I wrote a extender function to observableArray in knockout js. What I'm looking for is a way to extract the intersection records based on one property. This works well on smaller number of arrays, but shows pretty poor performance in larger arrays. I dont know if it is the observables that makes it slower?
How would you guys write it?
obsArray2 - The array to compare with
Key - Name of the property to compare between
ko.observableArray.fn.intersect = function (obsArray2, Key) {
var self = Enumerable.From(ko.unwrap(this));
var arrValues1 = self.Select(function (item) { return ko.unwrap(item[Key]); });
arrValues2 = Enumerable.From(ko.unwrap(obsArray2)).Select(function (item) { return ko.unwrap(item[Key]); });
var IntersectedValues = arrValues1.Intersect(arrValues2).ToArray();
return self.Where(function (item) { return IntersectedValues.contains(ko.unwrap(item[Key])) }).ToArray();
return obsArray1.Intersect(obsArray2).ToArray();
};
