name-value

I'm in progress with estimation of MongoDB for our customers. Per requirements we need associate with some entity ent variable set of name-value pairs. db.ent.insert({'a':5775, 'b':'b1'}) db.ent.insert({'c':'its a c', 'b':'b2'}) db.ent.insert({'a':7557, 'c':'its a c'}) After this I need intensively query ent for presence of fields: db.ent.find({'a':{$exists:true}}) db.ent.find({'c':{$exists:false}}) Per MongoDB docs : $exists is not very efficient even with an index, and esp. with {$exists:true} since it will effectively have to scan all indexed values. Can experts there provide more efficient

How I can convert an array to an array of JavaScript objects. For example I have an array as data = [ ["fruits","frozen","fresh","rotten"], ["apples",884,494,494], ["oranges",4848,494,4949], ["kiwi",848,33,33] ] I want to convert it to a name value pair. For example, first object in the resulting collection would be {"fruits": "apple", "frozen": 884, "fresh": 494, "rotten": 494} and so on for rest of the data. DEMO Using your supplied data: var data = [ ["fruits","frozen","fresh","rotten"], ["apples",884,494,494], ["oranges",4848,494,4949], ["kiwi",848,33,33] ] The following function will

I have a function that takes optional arguments as name/value pairs. function example(varargin) % Lots of set up stuff vargs = varargin; nargs = length(vargs); names = vargs(1:2:nargs); values = vargs(2:2:nargs); validnames = {'foo', 'bar', 'baz'}; for name = names validatestring(name{:}, validnames); end % Do something ... foo = strmatch('foo', names); disp(values(foo)) end example('foo', 1:10, 'bar', 'qwerty') It seems that there is a lot of effort involved in extracting the appropriate values (and it still isn't particularly robust again badly specified inputs). Is there a better way of