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How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?
... performSelector:withObject:afterDelay: but with an argument like int / double / float ?
19 Answers
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Is recursion ever faster than looping?
...d. Recursion, by definition, is a mathematical concept, and has little to do with stack frames and assembly stuff.
– P Shved
Apr 16 '10 at 7:05
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How do you tell a specific Delayed::Job to run in console?
...t remember that it won't run any other things like destroying job that was done or so on. just running the job/task.
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How do you grep a file and get the next 5 lines
How do I grep a file for 19:55 and get the Line 1,2,3,4,5?
3 Answers
3
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Is ServiceLocator an anti-pattern?
... patterns as anti-patterns just because there are some situations where it does not fit, then YES it's an anti pattern. But with that reasoning all patterns would also be anti patterns.
Instead we have to look if there are valid usages of the patterns, and for Service Locator there are several use c...
Disable cache for some images
... this problem that feels like a hack but is fairly portable is to add a randomly generated query string to each request for the dynamic image.
So, for example -
<img src="image.png" />
Would become
<img src="image.png?dummy=8484744" />
Or
<img src="image.png?dummy=371662" />...
Rearrange columns using cut
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It's too bad cut doesn't support this intuitive re-ordering command. Anyway, another tip: you can use awk's -FS and -OFS options to use custom input and output field separators (like -d and --output-delimiter for cut).
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Postgres: clear entire database before re-creating / re-populating from bash script
...the database and then re-create it. On a UNIX or Linux system, that should do it:
$ dropdb development_db_name
$ createdb developmnent_db_name
That's how I do it, actually.
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Correct way to write line to file?
I'm used to doing print >>f, "hi there"
14 Answers
14
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Why is string concatenation faster than array join?
...sites
The V8 javascript engine (used in Google Chrome) uses this code to do string concatenation:
// ECMA-262, section 15.5.4.6
function StringConcat() {
if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
throw MakeTypeError("called_on_null_or_undefined", ["String.prototype...