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Equivalent of “throw” in R
How does one "throw" an error in R? I have a function that takes a data frame and some column names and does stuff with them. If the columns don't exist, I want the function to stop and to stop all functions depending on it.
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Definition of a Balanced Tree
I am just wondering if someone might be able to clarify the definition of a balanced tree for me. I have that "a tree is balanced if each sub-tree is balanced and the height of the two sub-trees differ by at most one.
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What is “Argument-Dependent Lookup” (aka ADL, or “Koenig Lookup”)?
What are some good explanations on what argument dependent lookup is? Many people also call it Koenig Lookup as well.
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Difference between declaring variables before or in loop?
I have always wondered if, in general, declaring a throw-away variable before a loop, as opposed to repeatedly inside the loop, makes any (performance) difference?
A (quite pointless) example in Java:
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What “things” can be injected into others in Angular.js?
I'm having a little hard time understanding Dependency Injection in Angular. So my question is, can anyone explain which of the "types", like Controller, Factory, Provider, etc can we inject into others, including other instances of same "type"?
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When should I use uuid.uuid1() vs. uuid.uuid4() in python?
I understand the differences between the two from the docs.
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Unnamed/anonymous namespaces vs. static functions
A feature of C++ is the ability to create unnamed (anonymous) namespaces, like so:
11 Answers
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Validate that a string is a positive integer
I would like the simplest fail-safe test to check that a string in JavaScript is a positive integer.
13 Answers
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How to select html nodes by ID with jquery when the id contains a dot?
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8 Answers
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Download and open PDF file using Ajax
I have an action class that generates a PDF. The contentType is set appropriately.
15 Answers
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