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Difference between Big-O and Little-O Notation
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f ∈ O(g) says, essentially
For at least one choice of a constant k > 0, you can find a constant a such that the inequality 0 <= f(x) <= k g(x) holds for all x > a.
Note that O(g) is the set of all functions for which this condition holds...
Understanding recursion [closed]
... is empty, nothing to do
}
}
Hmm, couldn't we have just done that in a for loop?
Why, yes, recursion can be replaced with iteration, but often recursion is more elegant.
Let's talk about trees. In computer science, a tree is a structure made up of nodes, where each node has some number of chil...
Maven check for updated dependencies in repository
...ons plugin and its display-dependency-updates mojo are what you're looking for:
mvn versions:display-dependency-updates
Here is what the output looks like:
[INFO] ------------------------------------------------------------------------
[INFO] Building Build Helper Maven Plugin
[INFO] task-segm...
Why does the indexing start with zero in 'C'?
... that array refers (0 elements away), so it should be denoted as array[0].
For more info:
http://developeronline.blogspot.com/2008/04/why-array-index-should-start-from-0.html
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Formatting a number with exactly two decimals in JavaScript
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To format a number using fixed-point notation, you can simply use the toFixed method:
(10.8).toFixed(2); // "10.80"
var num = 2.4;
alert(num.toFixed(2)); // "2.40"
Note that toFixed() returns a string.
IMPORTANT: Note that toF...
Convert Data URI to File then append to FormData
...k is to extract an image file from the canvas object and append it to a FormData object for upload.
14 Answers
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How can I count the number of matches for a regex?
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matcher.find() does not find all matches, only the next match.
Solution for Java 9+
long matches = matcher.results().count();
Solution for Java 8 and older
You'll have to do the following. (Starting from Java 9, there is a nicer solution)
int count = 0;
while (matcher.find())
count++;
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Placing border inside of div and not on its edge
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+1. For a little more background: css-tricks.com/box-sizing or paulirish.com/2012/box-sizing-border-box-ftw
– isotrope
Mar 7 '12 at 14:00
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How to create a cron job using Bash automatically without the interactive editor?
Does crontab have an argument for creating cron jobs without using the editor (crontab -e). If so, What would be the code create a cronjob from a Bash script?
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Checking to see if one array's elements are in another array in PHP
...little wrong with using array_intersect() and count() (instead of empty).
For example:
$bFound = (count(array_intersect($criminals, $people))) ? true : false;
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