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When do you use map vs flatMap in RxJava?
...'s begin.
Observable<LoginResponse> login(String email, String password);
Observable<UserInfo> fetchUserInfo(String userId);
Here are two methods, one for login returned Response, and another for fetching user info.
login(email, password)
.flatMap(response ->
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How can I sanitize user input with PHP?
...-_\\s\?\!]+\$",
'not_empty' => "[a-z0-9A-Z]+",
'words' => "^[A-Za-z]+[A-Za-z \\s]*\$",
'phone' => "^[0-9]{10,11}\$",
'zipcode' => "^[1-9][0-9]{3}[a-zA-Z]{2}\$",
'plate' => "^([0-9a-zA-Z]{2}[-]){2}[0-9a-zA-Z]{2}\$",
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What are the differences between vector and list data types in R?
...nyways. It's a vector in the same sense that SIMD/MMX/vector units use the word.
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Inline SVG in CSS
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Remember to remove any URL escaping before converting to base64. In other words, the above example showed color='#fcc' converted to color='%23fcc', you should go back to #.
The reason why base64 works better is that it eliminates all the issues with single and double quotes and url escaping
If y...
Explain the concept of a stack frame in a nutshell
... stack, we are talking about working with addresses and values at the byte/word level in assembly or machine code. There are "call stacks" when talking about higher-level languages, but they are a debugging/runtime tool managed by the runtime environment so that you can log what went wrong with your...
How to read a single char from the console in Java (as the user types it)?
... That's what I meant by stress-tested -- it's probably the wrong word; my bad. Anyway, nice! I've stolen^H^H^H^H^H^Hused it in a project of mine for school and it helped a bunch.
– Fund Monica's Lawsuit
May 15 '16 at 23:19
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Creating JS object with Object.create(null)?
...doesn't inherit from anything and thus has no properties at all.
In other words: A javascript object inherits from Object by default, unless you explicitly create it with null as its prototype, like: Object.create(null).
{} would instead be equivalent to Object.create(Object.prototype).
In Chro...
What is the rationale for all comparisons returning false for IEEE754 NaN values?
...nexceptional distinction between NaNs and numbers in languages that lack a word for NaN and a predicate IsNaN(x).
Note that this is also the logic that rules out returning something like a “Not-A-Boolean”. Maybe this pragmatism was misplaced, and the standard should have required isnan( ), ...
Why is there no Constant feature in Java?
... have learned that Java allows us to declare constants by using final keyword.
8 Answers
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ASP.NET MVC - Should business logic exist in controllers?
...& Practices. And I believe in the adage 'A picture is worth a thousand words'.
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