How to remove from a map while iterating it?
How do I remove from a map while iterating it? like: std::map<K, V> map; for(auto i : map) if(needs_removing(i)) // remove it from the map If I use map.erase it will invalidate the iterators 6 Answers 6
map
What does the “map” method do in Ruby?
I’m new to programming. Can someone explain what .map would do in: params = (0…param_count).map 8 Answers 8
Google map that opens in a new window
I have a custom post type called ‘Venue’ and I would like my users to be able to create a map to that venue, basically just a marker on a map with the name of the venue and its address. The thing is that I want to create a small snapshot of the map and … Read more
Determine if map contains a value for a key?
What is the best way to determine if a STL map contains a value for a given key? #include <map> using namespace std; struct Bar { int i; }; int main() { map<int, Bar> m; Bar b = {0}; Bar b1 = {1}; m[0] = b; m[1] = b1; //Bar b2 = m[2]; map<int, Bar>::iterator … Read more
Best way to show map of tagged posts?
This seems so simple that I’m tearing my hair out. I want to add a page with a map showing all the posts with a particular tag. I want each marker to pop up with the title and the preview, allowing the visitor to click through and read the full post. Ideally I want to … Read more
WordPress Google Maps
Does anyone know of a nice map plugin for WordPress? I have a diary website in WordPress where each diary entry has the latitude and longitude of where each post was written. I thought it would be cool for each post to have a google map showing where each entry was written. Maybe even show … Read more
What are the reasons why Map.get(Object key) is not (fully) generic
What are the reasons behind the decision to not have a fully generic get method in the interface of java.util.Map<K, V>. To clarify the question, the signature of the method is V get(Object key) instead of V get(K key) and I’m wondering why (same thing for remove, containsKey, containsValue). 11 Answers 11
Difference between map and collect in Ruby?
I have Googled this and got patchy / contradictory opinions – is there actually any difference between doing a map and doing a collect on an array in Ruby/Rails? The docs don’t seem to suggest any, but are there perhaps differences in method or performance? 6 Answers 6
How to convert a Map to List in Java?
What is the best way to convert a Map<key,value> to a List<value>? Just iterate over all values and insert them in a list or am I overlooking something? 14 s 14 List<Value> list = new ArrayList<Value>(map.values()); assuming: Map<Key,Value> map;
Difference between HashMap, LinkedHashMap and TreeMap
What is the difference between HashMap, LinkedHashMap and TreeMap in Java? I don’t see any difference in the output as all the three has keySet and values. What are Hashtables? Map m1 = new HashMap(); m1.put(“map”, “HashMap”); m1.put(“schildt”, “java2”); m1.put(“mathew”, “Hyden”); m1.put(“schildt”, “java2s”); print(m1.keySet()); print(m1.values()); SortedMap sm = new TreeMap(); sm.put(“map”, “TreeMap”); sm.put(“schildt”, “java2”); sm.put(“mathew”, … Read more
