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how to get first three characters of an NSString?
...e string contains at least 3 characters:
NSString *fullString = /* obtain from somewhere */;
NSString *prefix = nil;
if ([fullString length] >= 3)
prefix = [fullString substringToIndex:3];
else
prefix = fullString;
substringToIndex: will throw an exception if the index you provide is ...
How do I set a conditional breakpoint in gdb, when char* x points to a string whose value equals “he
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This method can have side effects. $_streq method from @tlwhitec is better.
– rools
Apr 14 '19 at 14:08
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Drop a temporary table if it exists
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From SQL Server 2016 you can just use
DROP TABLE IF EXISTS ##CLIENTS_KEYWORD
On previous versions you can use
IF OBJECT_ID('tempdb..##CLIENTS_KEYWORD', 'U') IS NOT NULL
/*Then it exists*/
DROP TABLE ##CLIENTS_KEYWORD
CRE...
How to return smart pointers (shared_ptr), by reference or by value?
...g> names;
get_names( names );
Unfortunately, this approach is far from ideal.
The code grew by 150%
We’ve had to drop const-ness because we’re mutating names.
As functional programmers like to remind us, mutation makes code more complex to reason about by undermining referen...
if, elif, else statement issues in Bash
... command (or a builtin in some shells). It must be separated by whitespace from the preceding statement:
elif [
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How are cookies passed in the HTTP protocol?
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Apart from what it's written in other answers, other details related to path of cookie, maximum age of cookie, whether it's secured or not also passed in Set-Cookie response header. For instance:
Set-Cookie:name=value[; expires=da...
How to find the length of a string in R
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Or use stri_length from stringi - it works fine with NA's and it is faster :) Check my post!
– bartektartanus
Apr 4 '14 at 16:37
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How to check if multiple array keys exists
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@Ozh aside from that array_key_exists is slower than isset
– iautomation
Mar 1 '16 at 22:49
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Table Header Views in StoryBoards
...e did I mention a section header? The section in the methods are necessary from the framework. Every TableView has at least one section if you don't know that. Just pass section 0 If you don't have sections.
– Badr
May 20 at 17:39
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How to create a protocol with methods that are optional?
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From the Apple page on "Formal Protocols":
Optional Protocol
methods can be marked as optional
using the @optional keyword.
Corresponding to the @optional modal
keyword, there is a @required keyword
to formally...