Chen, I think your answer is correct. Some further background that might be helpful: In JavaScript, which was the original context for JSON, an object is like a hash map of strings to values, where some values are data, others are functions. You can think of each name-value pair as a property. But JavaScript doesn’t … Read more
Recovering doesn’t work here because what you experience is not a panicing state. Go 1.6 added a lightweight concurrent misuse of maps detection to the runtime: The runtime has added lightweight, best-effort detection of concurrent misuse of maps. As always, if one goroutine is writing to a map, no other goroutine should be reading or … Read more
Update for Swift 2, Xcode 7: As @atxe noticed, NSUserDefaults dictionaries are now mapped as [String, AnyObject]. This is a consequence of the Objective-C “lightweight generics” which allow to declare the Objective-C method as – (NSDictionary<NSString *,id> *)dictionaryForKey:(NSString *)defaultName (Default objects must be property lists and in particular the dictionary keys can only be strings.) … Read more
That looks like a perfectly fine way to do this to me. I don’t think copying one map into another is common enough to have a one-liner solution.
The definition for Dictionary is struct Dictionary<KeyType : Hashable, ValueType> : …, i.e. the type of the key must conform to the protocol Hashable. But the language guide tells us that protocols can be adopted by classes, structs and enums, i.e. not by tuples. Therefore, tuples cannot be used as Dictionary keys. A workaround would … Read more
Current IDEA versions load dictionaries in UTF-8, you don’t need to convert them to the platform encoding, ignore the iconv step below. The dictionary can be produced using aspell for Unix/Mac OS X or under Cygwin. You need to have aspell and appropriate dictionary installed. Here is the example for Russian dictionary I’ve used: aspell … Read more
Two terms for the same thing: “Map” is used by Java, C++ “Dictionary” is used by .Net, Python “Associative array” is used by PHP “Map” is the correct mathematical term, but it is avoided because it has a separate meaning in functional programming. Some languages use still other terms (“Object” in Javascript, “Hash” in Ruby, … Read more
The solution to this is quite simple. Leads should have posted it. when your markers are moving around your map it’s because the map doesn’t know the size of your marker and/or it doesn’t know the point of your marker that marks the location. your marker icon code might look like this: var locationIcon = … Read more
You are not copying the map, but the reference to the map. Your delete thus modifies the values in both your original map and the super map. To copy a map, you have to use a for loop like this: for k,v := range originalMap { newMap[k] = v } Here’s an example from the … Read more
This is an old question, but here’s my two cents. PeterSO’s answer is slightly more concise, but slightly less efficient. You already know how big it’s going to be so you don’t even need to use append: keys := make([]int, len(mymap)) i := 0 for k := range mymap { keys[i] = k i++ } … Read more