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Checking if a key exists in a JavaScript object?
How do I check if a particular key exists in a JavaScript object or array?
22 Answers
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PostgreSQL naming conventions
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Regarding tables names, case, etc, the prevalent convention is:
SQL keywords: UPPER CASE
names (identifiers): lower_case_with_underscores
For example:
UPDATE my_table SET name = 5;
This is not written in stone, but the bit about identifiers in lower case is highly recommended, IMO. Postgresq...
.bashrc/.profile is not loaded on new tmux session (or window) — why?
When tmux starts or opens a new window, it does not load my .profile or .bashrc . I end up typing . ~/.bashrc every time. Is there a way to make this happen automatically?
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what is faster: in_array or isset? [closed]
This question is merely for me as I always like to write optimized code that can run also on cheap slow servers (or servers with A LOT of traffic)
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Checking if array is multidimensional or not?
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The short answer is no you can't do it without at least looping implicitly if the 'second dimension' could be anywhere. If it has to be in the first item, you'd just do
is_array($arr[0]);
But, the most efficient general way I c...
Implications of foldr vs. foldl (or foldl')
Firstly, Real World Haskell , which I am reading, says to never use foldl and instead use foldl' . So I trust it.
7 A...
Predicate Delegates in C#
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A predicate is a function that returns true or false. A predicate delegate is a reference to a predicate.
So basically a predicate delegate is a reference to a function that returns true or false. Predicates are very useful for filtering a list of values - here is a...
How to fix “Headers already sent” error in PHP
When running my script, I am getting several errors like this:
11 Answers
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How to detect if my shell script is running through a pipe?
...m within a shell script if its standard output is being sent to a terminal or if it's piped to another process?
6 Answers
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TypeScript or JavaScript type casting
How does one handle type casting in TypeScript or Javascript?
3 Answers
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