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Checking for empty arrays: count vs empty
...s set.
In other words, if the variable is not set, you will get a notice from PHP saying it's undefined. Therefore, before using count, it would be preferable to check the variable with isset. This is not necessary with empty.
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When should I use h:outputLink instead of h:commandLink?
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I find that hard to believe. Aside from hearsay/your own anecdotal evidence, do you have anything to support that?
– Matt Ball
Jun 20 '11 at 18:58
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jQuery map vs. each
...ewItems is [2,3,4,5]
You can also use the map function to remove an item from an array. For example:
var items = [0,1,2,3,4,5,6,7,8,9];
var itemsLessThanEqualFive = $.map(items, function(i) {
// removes all items > 5
if (i > 5)
return null;
return i;
});
// itemsLessThanEqualFi...
How can I debug git/git-shell related problems?
...19)
The new documentation now includes config settings which are only read from the system and global config files (meaning repository local and worktree config files and -c command line arguments are not respected.)
Example:
$ git config --global trace2.normalTarget ~/log.normal
$ git version
git v...
How to do stateless (session-less) & cookie-less authentication?
...d recommend you to add random token or random verifer, to protect yourself from Cross Site Request Forgery (CSRF) attacks.
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How can I have two fixed width columns with one flexible column in the center?
...lex-shrink the specified width can be ignored and flex items are prevented from overflowing the container.
I'm trying to set up a flexbox with 3 columns where the left and right columns have a fixed width...
You will need to disable shrinking. Here are some options:
.left, .right {
width...
Does pandas iterrows have performance issues?
I have noticed very poor performance when using iterrows from pandas.
6 Answers
6
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How do you match only valid roman numerals with a regular expression?
...I found no other way around it. I needed to scrub off the footnote numbers from my plain text document, where text such as "the Red Seacl and the Great Barrier Reefcli" had been converted to the Red Seacl and the Great Barrier Reefcli. But I still had problems with valid words like Tahiti and fantas...
How do I check if a list is empty?
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The pythonic way to do it is from the PEP 8 style guide (where Yes means “recommended” and No means “not recommended”):
For sequences, (strings, lists, tuples), use the fact that empty sequences are false.
Yes: if not seq:
if seq:
N...
Guava: Why is there no Lists.filter() function?
...s returning a new materialised list, which is actually what I would expect from a filter method for lists as opposed to the one on Iterable.
– Felix Leipold
May 27 '15 at 22:27
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