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npm install vs. update - what's the difference?
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The difference between npm install and npm update handling of package versions specified in package.json:
{
"name": "my-project",
"version": "1.0", // install update
"dependencies": { // ---------...
Best Practice: Initialize JUnit class fields in setUp() or at declaration?
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If you're wondering specifically about the examples in the JUnit FAQ, such as the basic test template, I think the best practice being shown off there is that the class under test should be instantiated in your setUp method (or in a test method).
When the JU...
Why declare a struct that only contains an array in C?
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It allows you to pass the array to a function by value, or get it returned by value from a function.
Structs can be passed by value, unlike arrays which decay to a pointer in these contexts.
sha...
vector::at vs. vector::operator[]
I know that at() is slower than [] because of its boundary checking, which is also discussed in similar questions like C++ Vector at/[] operator speed or ::std::vector::at() vs operator[] << surprising results!! 5 to 10 times slower/faster! . I just don't understand what the at() met...
How to add new item to hash
I'm new to Ruby and don't know how to add new item to already existing hash. For example, first I construct hash:
7 Answers...
Rails mapping array of hashes onto single hash
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You could compose Enumerable#reduce and Hash#merge to accomplish what you want.
input = [{"testPARAM1"=>"testVAL1"}, {"testPARAM2"=>"testVAL2"}]
input.reduce({}, :merge)
is {"testPARAM2"=>"testVAL2", "testPARAM1"=>"testVAL1"}
Reducin...
Function to calculate distance between two coordinates
I'm currently using the function below and it doesn't work properly. According to Google Maps, the distance between these coordinates (from 59.3293371,13.4877472 to 59.3225525,13.4619422 ) are 2.2 kilometres while the function returns 1.6 kilometres. How can I make this function return the ...
Is it possible to declare two variables of different types in a for loop?
Is it possible to declare two variables of different types in the initialization body of a for loop in C++?
8 Answers
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How can I delete the current line in Emacs?
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C-a # Go to beginning of line
C-k # Kill line from current point
There is also
C-S-backspace # Ctrl-Shift-Backspace
which invokes M-x kill-whole-line.
If you'd like to set a different global key binding, you'd put this in ...
Undo git stash pop that results in merge conflict
I began making changes to my codebase, not realizing I was on an old topic branch. To transfer them, I wanted to stash them and then apply them to a new branch off of master. I used git stash pop to transfer work-in-progress changes to this new branch, forgetting that I hadn't pulled new changes i...