When do you use map vs flatMap in RxJava? Say, for example, we want to map Files containing JSON into Strings that contain the JSON– Using map, we have to deal with the Exception somehow. But how?: Observable.from(jsonFile).map(new Func1<File, String>() { @Override public String call(File file) { try { return new Gson().toJson(new FileReader(file), Object.class); } … Read more
I have a data structure which essentially amounts to a nested dictionary. Let’s say it looks like this: {‘new jersey’: {‘mercer county’: {‘plumbers’: 3, ‘programmers’: 81}, ‘middlesex county’: {‘programmers’: 81, ‘salesmen’: 62}}, ‘new york’: {‘queens county’: {‘plumbers’: 9, ‘salesmen’: 36}}} Now, maintaining and creating this is pretty painful; every time I have a new state/county/profession … Read more
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Imagine two positive integers A and B. I want to combine these two into a single integer C. There can be no other integers D and E which combine to C. So combining them with the addition operator doesn’t work. Eg 30 + 10 = 40 = 40 + 0 = 39 + 1 Neither … Read more
Can anyone explain the difference between Server.MapPath(“.”), Server.MapPath(“~”), Server.MapPath(@”\”) and Server.MapPath(“https://stackoverflow.com/”)? 3 Answers 3
Bearing in mind that I’ll be performing calculations on lat / long pairs, what datatype is best suited for use with a MySQL database? 21 Answers 21 Basically it depends on the precision you need for your locations. Using DOUBLE you’ll have a 3.5nm precision. DECIMAL(8,6)/(9,6) goes down to 16cm. FLOAT is 1.7m… This very … Read more
Given a dictionary like so: my_map = {‘a’: 1, ‘b’: 2} How can one invert this map to get: inv_map = {1: ‘a’, 2: ‘b’} 32 s 32
What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim? 4 remap is an option that makes mappings work recursively. By default it is on and I’d recommend you leave it that way. The rest are mapping commands, described below: :map and :noremap are recursive and non-recursive versions of the … Read more
