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Empty arrays seem to equal true and false at the same time
...comparison x ==
ToNumber(y).
The result of ToNumber(false) is 0, so we now have:
[] == 0
Again, rule #1 tells us to jump to step #14, but the next step that actually applies is #21:
21. If Type(x) is Object and Type(y) is either String or Number, return the
result of the comparison
To...
Run MySQLDump without Locking Tables
...ng (and you use foreign keys), you're dump may be inconsistent. You won't know until you restore it and happen to run JOIN queries on the inconsistent data. It may take a while for the inconsistent data to be discovered because the JOINs are used by your application not Mysql (with MyISAM tables); t...
How to make a phone call using intent in Android?
...t placed call permissions tag before application tag in manifest file
and now every thing is working fine.
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UITableView Setting some cells as “unselectable”
...crazy semicolon. That will swift it for you. ' FALSE' was evil and wrong, now 'NO' is evil and wrong. Until next week when 'false' is evil and wrong do it that way.
– HalR
Nov 16 '16 at 20:43
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PHP script to loop through all of the files in a directory?
...ike to be able to sort the files by name, type or by date created/added/modified. (Think fancy directory "index".) I'd also like to be able to add exclusions to the list of files, such as the script itself or other "system" files. (Like the . and .. "directories".)
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How to avoid 'cannot read property of undefined' errors?
...
Update:
If you use JavaScript according to ECMAScript 2020 or later, see optional chaining.
TypeScript has added support for optional chaining in version 3.7.
// use it like this
obj?.a?.lot?.of?.properties
Solution for JavaScr...
Is there a RegExp.escape function in Javascript?
...
If you are going to use this function in a loop, it's probably best to make the RegExp object it's own variable var e = /[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g; and then your function is return s.replace(e, '\\$&'); This wa...
Convert Unix timestamp to a date string
...-r the same as these other implementations. So unfortunately you have to know which version of date you're using, and many older Unix date commands don't support either option.
Even worse, POSIX date recognizes neither -d nor -r and provides no standard way in any command at all (that I know of) t...
Waiting until two async blocks are executed before starting another block
...rrently? I mean, assume that block1 and block2 are associated with a group now, will block2 wait until block1 is done before it can start executing?
– tom
Aug 10 '12 at 22:25
9
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List of special characters for SQL LIKE clause
...with ean (Dean, Sean, and so on).
[ ] Any single character within the specified range ([a-f]) or set ([abcdef]).
WHERE au_lname LIKE '[C-P]arsen' finds author last names ending with arsen and starting with any single character between C and P, for example Carsen, Larsen, Karsen, and so on. In range...