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Is there a difference between YES/NO,TRUE/FALSE and true/false in objective-c?
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There is no practical difference provided you use BOOL variables as booleans. C processes boolean expressions based on whether they evaluate to 0 or not 0. So:
if(someVar ) { ... }
if(!someVar) { ... }
means the same as
if(someVar!=0) { ... }
if(someVar==0)...
Convert a row of a data frame to vector
... been changed in the meantime, but today unlist allows dropping names: identical(unlist(df[1,], use.names = FALSE), as.numeric(df[1,])) (and btw df still is not a sensible name for a data.frame... ;-))
– Andri Signorell
Sep 25 '19 at 13:51
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Should try…catch go inside or outside a loop?
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while (true) {
++j;
if (j == 20) { throw new Exception(); }
if (j%4 == 0) { System.out.println(j); }
if (j == 40) { break; }
}
} catch (Exception e) {
System.out.println("in catch block");
}
The while loop is inside ...
Uses for the Java Void Reference Type?
...em.
It is also often used in for example Map values (although Collections.newSetFromMap uses Boolean as maps don't have to accept null values) and java.security.PrivilegedAction.
I wrote a weblog entry on Void a few years back.
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Java 8 Streams - collect vs reduce
...en every time your accumulator function processes an element, it creates a new collection that includes the element, which is inefficient.
– raghu
May 12 '18 at 9:50
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How do I trim a file extension from a String in Java?
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This should be assigned to a new variable as str is not modified.
– Nathan Feger
Jun 2 '09 at 19:24
51
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Return positions of a regex match() in Javascript?
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@JimboJonny, hm well I learned something new. My test case returns undefined. jsfiddle.net/6uwn1vof/2 which is not a search-like example like yours.
– Onur Yıldırım
Mar 29 '16 at 22:37
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What does ^M character mean in Vim?
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Unix uses 0xA for a newline character. Windows uses a combination of two characters: 0xD 0xA. 0xD is the carriage return character. ^M happens to be the way vim displays 0xD (0x0D = 13, M is the 13th letter in the English alphabet).
You can rem...
PHP Session Fixation / Hijacking
...ssion information for you. The old ID is no longer valid and will cause a new session to be created if the attacker (or anyone else for that matter) tries to use it. Be careful with custom session handlers though....
Destroying a Session
If you're going to destroy a session (on logout for exampl...
In an array of objects, fastest way to find the index of an object whose attributes match a search
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The new Array method .filter() would work well for this:
var filteredArray = array.filter(function (element) {
return element.id === 0;
});
jQuery can also do this with .grep()
edit: it is worth mentioning that both of t...