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Is there a performance difference between i++ and ++i in C?
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Executive summary: No.
i++ could potentially be slower than ++i, since the old value of i
might need to be saved for later use, but in practice all modern
compilers will optimize this away.
We can demonstrate this by looking at the code for this function,
both wit...
What does middleware and app.use actually mean in Expressjs?
...re but I haven't found a clear, concise explanation of what middleware actually is and what the app.use statement is doing. Even the express docs themselves are a bit vague on this. Can you explain these concepts for me please?
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How do I prompt for Yes/No/Cancel input in a Linux shell script?
...is a simple demonstration:
while true; do
read -p "Do you wish to install this program?" yn
case $yn in
[Yy]* ) make install; break;;
[Nn]* ) exit;;
* ) echo "Please answer yes or no.";;
esac
done
Another method, pointed out by Steven Huwig, is Bash's select co...
How to sort in-place using the merge sort algorithm?
...the merging sequence that the unmerged elements won't be overwritten.
Actually, instead of sorting the second half of the working area, we can sort the first half, and put the working area between the two sorted arrays like this:
... sorted 1/4 array B | unsorted work area | ... sorted 1/2 array A...
YouTube iframe API: how do I control an iframe player that's already in the HTML?
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Fiddle Links: Source code - Preview - Small version
Update: This small function will only execute code in a single direction. If you want full support (eg event listeners / getters), have a look at Listening for Youtube Event in jQuery
As a result of a deep code a...
Working with select using AngularJS's ng-options
...of the array item the option tag relates to. This is because AngularJS actually allows you to select entire objects with select controls, and not just primitive types. For example:
app.controller('MainCtrl', function($scope) {
$scope.items = [
{ id: 1, name: 'foo' },
{ id: 2, name: 'ba...
Twitter's typeahead.js suggestions are not styled (have no border, transparent background, etc.)
...itter's typeahead.js 0.9.3 and it seems my suggestions are not styled at all.
9 Answers
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Post-increment and pre-increment within a 'for' loop produce same output [duplicate]
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When increment is called for a class, it might become non-equal to call post- or pre- increment, since it's behavior might differ much.
– mbaitoff
Jan 16 '11 at 15:48
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How to sort an array in Bash
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You don't really need all that much code:
IFS=$'\n' sorted=($(sort <<<"${array[*]}"))
unset IFS
Supports whitespace in elements (as long as it's not a newline), and works in Bash 3.x.
e.g.:
$ array=("a c" b f "3 5")
$ IFS=$...
Way to get number of digits in an int?
...K, there is nothing "un-neat" about it. You have to realize that mathematically, numbers don't have a length, nor do they have digits. Length and digits are both properties of a physical representation of a number in a specific base, i.e. a String.
A logarithm-based solution does (some of) the same...