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Difference between `set`, `setq`, and `setf` in Common Lisp?
...undefined behaviour, because the value of ls is constant (like modifying a string literal in C). After (setq ls (list (list (list 1)))), (setf (car (car (car ls))) 5) works just like ls->val->val->val = 5 in C.
– kyle
Jun 13 '17 at 1:41
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Negation in Python
...'s) is an accident waiting to happen -- two instances of a longish literal string that presumably should be identical. And please don't retort that it's just an example -- it's a BAD example for newbies.
– John Machin
May 24 '11 at 23:01
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Open terminal here in Mac OS finder [closed]
... activate
set frontWin to folder of front window as string
set frontWinPath to (get POSIX path of frontWin)
tell application "Terminal"
activate
do script with command "cd \"" & frontWinPath & "\""
end...
mailto link with HTML body
...tlook. Note that you must only encode the body text, not the entire mailto string; and you don't need spaces before/after the \n.
– Luke
Nov 12 '14 at 21:42
2
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Prevent browser caching of AJAX call result
...
Personally I feel that the query string method is more reliable than trying to set headers on the server - there's no guarantee that a proxy or browser won't just cache it anyway (some browsers are worse than others - naming no names).
I usually use Math.ra...
Object initialization syntax
...gives you a similar syntax, but keeps things immutable:
type Person(name:string, ?birthDate) =
member x.Name = name
member x.BirthDate = defaultArg birthDate System.DateTime.MinValue
Now we can write:
let p1 = new Person(name="John", birthDate=DateTime.Now)
let p2 = new Person(name="John")
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unique object identifier in javascript
...akMap as opposed to Map? That function will crash if you provide it with a string or number.
– Nate Symer
Nov 20 '19 at 19:09
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Conditionally start at different places in storyboard from AppDelegate
...troller, and send the performSegueWithIdentifier:sender: message to it:
NSString *segueId = success ? @"pushMain" : @"pushLogin";
[self.window.rootViewController performSegueWithIdentifier:segueId sender:self];
share
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Listing each branch and its last revision's date in Git
... for showing how to use it with .gitconfig! Also fwiw I changed the format string to: --format='%(authordate)%09%(objectname:short)%09%(refname)' which gets the short hash of each branch as well.
– Noah Sussman
Apr 4 '13 at 14:15
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Is it OK to use == on enums in Java?
...owever, the enum construct gives you various benefits:
Each instance's toString() prints the name given in code.
(As mentioned in another post,) a variable of the enum type can be compared against constants using the switch-case control structure.
All the values in the enumeration can be queried u...