If you need to extract an element key based on an index, this function can be used: If you need to extract the Key where the element value is equal to the integer generated randomly, you can use the following function: Make sure that you added reference to System.Linq in your class. Side Note: The first element … Read more
The class AbstractMap.SimpleEntry is generic and can be useful.
One option if the number of keys is small is to use chained gets: But if you have keySet defined, this might be clearer: The chained gets do not short-circuit, so all keys will be checked but only one used. If you have enough possible keys that that matters, use the for loop.
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, “Table” in Lua), but those all … Read more
If I can rephrase your question, what you want is a dictionary with the years as keys and an array for each year containing a list of values associated with that year, right? Here’s how I’d do it: What you should end up with in years_dict is a dictionary that looks like the following: In … Read more
At the simplest level, a key-value pair is just two values, one of which you have designated to be a “key” and the other you have designated to be the “value”. However, it is more common to talk about key-value pairs in the context of a mapping, i.e. a (mathematical) function which maps from a … Read more
You’ll want a Map<String, String>. Classes that implement the Map interface include (but are not limited to): HashMap LinkedHashMap Hashtable Each is designed/optimized for certain situations (go to their respective docs for more info). HashMap is probably the most common; the go-to default. For example (using a HashMap): type of animal