key-value

I have a R dataset with key value strings which looks like below: quest<-data.frame(city=c("Atlanta","New York","Atlanta","Tampa"), key_value=c("rev=63;qty=1;zip=45987","rev=10.60|34;qty=1|2;zip=12686|12694","rev=12;qty=1;zip=74268","rev=3|24|8;qty=1|6|3;zip=33684|36842|30254")) which translates to: city key_value 1 Atlanta rev=63;qty=1;zip=45987 2 New York rev=10.60|34;qty=1|2;zip=12686|12694 3 Atlanta rev=12;qty=1;zip=74268 4 Tampa rev=3|24|8;qty=1|6|3;zip=33684|36842|30254 Based on the above dataframe how can I create a new data frame which looks like below : city rev qty zip 1 Atlanta 63.0

In using Vaadin Flow, version 14, I know we can store state as key-value pairs kept as "attributes" via getAttribute / setAttribute / removeAttribute methods found on: VaadinSession (per-user scope) VaadinContext (web-app scope) How does one access the current object for those classes? VaadinSession.getCurrent() For that per-user scope , the VaadinSesion class provides a static class method getCurrent to access the current instance. VaadinSession session = VaadinSession.getCurrent() ; // Fetch current instance of `VaadinSession` to use its key-value collection of attributes. session

Is it possible to get the "key" value from a SharedPreferences file if I know the "value" value it is paired with? Let's say I've gone into the SharedPreferences file and, through a user action, have got the value "London, UK". Now I want to get the KEY associated with the value "London, UK" and then use that for my next step, is this possible? The code I use at the moment to getAll data from the SharedPerferences, sort it by value, populate an AlertDialog with this data, deal with a user choosing an option from the AlertDialog and then returning the value of that choice. I now need the KEY

This question already has an answer here: How to update the value stored in Dictionary in C#? 6 answers I have the following code in c# , basically it's a simple dictionary with some keys and their values. Dictionary<string, int> dictionary = new Dictionary<string, int>(); dictionary.Add("cat", 2); dictionary.Add("dog", 1); dictionary.Add("llama", 0); dictionary.Add("iguana", -1); I want to update the key 'cat' with new value 5 . How could I do this? Have you tried just dictionary["cat"] = 5; :) Update dictionary["cat"] = 5+2; dictionary["cat"] = dictionary["cat"]+2; dictionary["cat"] += 2;

I'm having a bit of trouble reversing a given map and storing its reversed keys and values into another map. I have a method prototype as follows: public static Map<String, Set<String>> reverse (Map <String, Set<String>> graph); So if I have sample keys for the directed graph such that: {c -> arraySet{f, e}} {b -> d} {a -> arraySet{c, b}} {d -> g} {e -> d} {f -> arraySet{g, d}} I need to effectively reverse this graph so that instead of b -> d I have d -> b. I think all this requires is for me is to interchange the values and keys in the original graph and add them to the reverseMap. I suppose