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Why is using “for…in” for array iteration a bad idea?
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1581
The reason is that one construct:
var a = []; // Create a new empty array.
a[5] = 5; /...
C++ unordered_map using a custom class type as the key
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510
To be able to use std::unordered_map (or one of the other unordered associative containers) wi...
Does Java casting introduce overhead? Why?
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5 Answers
5
Active
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Create unique constraint with null columns
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15
@a_horse_with_no_name: I assume you know that I know that. That is actually one of the reasons I advise against it's usage. People who do n...
The written versions of the logical operators
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GManNickGGManNickG
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Eclipse ctrl+right does nothing
... the editor specifically (https://bugs.eclipse.org/bugs/show_bug.cgi?id=426557). Sometimes you can find that when you restart can't move with control+arrow in the editor but you can in other views like console window.
You can disable welcome screen ( in most eclipse based IDEs it's a checkbox in th...
On delete cascade with doctrine2
...e.
– Michael Ridgway
Jun 16 '11 at 15:44
60
I do too but it depends. Say for example you have an ...
How is std::function implemented?
...one, rather than sharing the state.
// g++4.8
int main() {
int value = 5;
typedef std::function<void()> fun;
fun f1 = [=]() mutable { std::cout << value++ << '\n' };
fun f2 = f1;
f1(); // prints 5
fun f3 = f1;
f2(); // pri...
How to sort an array in descending order in Ruby
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575
It's always enlightening to do a benchmark on the various suggested answers. Here's what I fou...
Version number comparison in Python
...mycmp("1.2", "2.1") < 0
assert mycmp("2.1", "1.2") > 0
assert mycmp("5.6.7", "5.6.7") == 0
assert mycmp("1.01.1", "1.1.1") == 0
assert mycmp("1.1.1", "1.01.1") == 0
assert mycmp("1", "1.0") == 0
assert mycmp("1.0", "1") == 0
assert mycmp("1.0", "1.0.1") < 0
assert mycmp("1.0.1", "1.0") >...