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How do you create optional arguments in php?
...MMasteR, here, you mean $bar === false - this is an action that should be done when $bar has defaulted to false. This will avoid incorrect action if 0 is passed in, so it does work - UNLESS a boolean is needed. As Kzqai said, a more general solution is to use $bar = null, because that can also be u...
Is there a regular expression to detect a valid regular expression?
... a recursive regex, and is not supported by many regex engines. PCRE based ones should support it.
Without whitespace and comments:
/^((?:(?:[^?+*{}()[\]\\|]+|\\.|\[(?:\^?\\.|\^[^\\]|[^\\^])(?:[^\]\\]+|\\.)*\]|\((?:\?[:=!]|\?<[=!]|\?>)?(?1)??\)|\(\?(?:R|[+-]?\d+)\))(?:(?:[?+*]|\{\d+(?:,\d*)?...
Rails 4: before_filter vs. before_action
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On the one hand deprecating has sense but on the other there is a good practice in rails and in ruby to have several aliases for one method so you can use it in different contexts without loss of meaning.
– fre...
How to add column if not exists on PostgreSQL?
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With Postgres 9.6 this can be done using the option if not exists
ALTER TABLE table_name ADD COLUMN IF NOT EXISTS column_name INTEGER;
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How to write DataFrame to postgres table?
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What does the variable contents do? Should this be the one that is written in copy_from()?
– n1000
Jun 22 '18 at 21:22
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Advantage of switch over if-else statement
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Technically there will still be one compare, to make sure the enum's value lies within the jump table.
– 0124816
Sep 19 '08 at 6:12
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Extract TortoiseSVN saved password
...name-only authentication (no password needed)
The first directory is the one of interest. It appears to contain files with names that look like GUIDs; one for each repository for which you've saved credentials.
The passwords in these files are encrypted by the Windows Data Protection API. The t...
Naming convention for unique constraint
...8, indexes can have filters too. Constraints can not
So, it comes down to one of
stick with UQ as per the rest of the SQL-using planet
use IK for unique indexes (IKC for clustered too) to be consistent...
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browser sessionStorage. share between tabs?
...orage and its "storage" eventListener to transfer sessionStorage data from one tab to another.
This code would need to exist on ALL tabs. It should execute before your other scripts.
// transfers sessionStorage from one tab to another
var sessionStorage_transfer = function(event) {
if(!event)...
Java multiline string
...be strings that are just +'d together. Some other options people have mentioned (StringBuilder, String.format, String.join) would only be preferable if you started with an array of strings.
Consider this:
String s = "It was the best of times, it was the worst of times,\n"
+ "it was the ag...