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Top Questions
97
votes
How to use performSelector:withObject:afterDelay: with primitive types in Cocoa?
objective-c
cocoa
asked May 24, 2009 at 19:46
stackoverflow.com
81
votes
What's the difference between a protocol extended from AnyObject and a class-only protocol?
class
swift
protocols
asked May 11, 2015 at 20:13
stackoverflow.com
51
votes
Alternative to performSelector in Swift?
swift
performselector
asked Jun 11, 2014 at 8:44
stackoverflow.com
46
votes
Ruby accessing outer variables in nested function
ruby
nested
variable-scope
asked Jun 19, 2009 at 5:04
stackoverflow.com
29
votes
Python-style integer division & modulus in C
java
c++
c
modulo
division
asked May 6, 2009 at 5:02
stackoverflow.com
26
votes
Objective-C @available guard AND'ed with more conditions
ios
objective-c
xcode9
availability
asked Oct 26, 2017 at 23:32
stackoverflow.com
18
votes
Are strtol, strtod unsafe?
c
const
stdlib
c-strings
const-char
asked Jun 14, 2009 at 20:36
stackoverflow.com
17
votes
NSSecureCoding trouble with collections of custom class
objective-c
nscoding
nssecurecoding
asked Jun 24, 2014 at 0:49
stackoverflow.com
16
votes
Could excess 401(k) contributions be used to game/maximize matches from different employers?
united-states
401k
excess-contribution
employer-match
asked Mar 8, 2012 at 10:16
money.stackexchange.com
15
votes
Calling method using optional chaining on weak variable causes EXC_BAD_ACCESS
swift
weak-references
asked Jun 11, 2014 at 23:44
stackoverflow.com
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Top Answers
1009
Simple way to repeat a string
stackoverflow.com
149
Strip Non-Alphanumeric Characters from an NSString
stackoverflow.com
91
How to get matches in iOS using regular expression?
stackoverflow.com
86
Where's the difference between setObject:forKey: and setValue:forKey: in NSMutableDictionary?
stackoverflow.com
74
Canadian citizen, TN worker, commute daily from Canada: am I a US person for tax purposes?
money.stackexchange.com
51
How to return nil in swift in a custom initializer?
stackoverflow.com
49
Can I use my Chinese passport to enter China after I acquired another citizenship?
travel.stackexchange.com
46
Who to contact about ESTA refusal for previously overstaying partner of US citizen?
travel.stackexchange.com
46
What to do when visa admission expires during lockdown?
travel.stackexchange.com
43
How to I pass @selector as a parameter?
stackoverflow.com
43
How can I check if I am banned from travelling to the US?
travel.stackexchange.com
42
Could my employer match contribution have caused me to have an excess 401K contribution?
money.stackexchange.com
42
What would be the fastest method to test for primality in Java?
stackoverflow.com
39
I’m waiting for my US passport (am a dual citizen). My father is ill and I booked a flight to see him - can I travel on my other passport?
travel.stackexchange.com
38
How is it that Ted Cruz can run for the U.S. presidency seeing as he was born in Calgary?
politics.stackexchange.com
36
Can I change planes to transit via the USA, when I am not allowed to enter it for non-essential reasons due to covid restrictions?
travel.stackexchange.com
35
What is the difference between instanceof and Class.isAssignableFrom(...)?
stackoverflow.com
35
Is the ban on applying for a US visa after marriage fraud a lifetime ban or 10 years?
travel.stackexchange.com
32
UIView Autoresizing Resources
stackoverflow.com
31
What new data caused Biden to be declared winner by the news?
politics.stackexchange.com
31
Can I be admitted to the US after a two-year overstay 21 years ago?
travel.stackexchange.com
30
does NSThread create autoreleasepool automatically now?
stackoverflow.com
30
Will Canadian citizens be denied entry to Canada during COVID-19 border closure?
travel.stackexchange.com
30
USA Tourist Visa Extension due to Covid-19 also Airlift for Indian nationals in the US details
travel.stackexchange.com
28
Canadian overstayed in the US for 14 years. Can I leave to Canada and return back to the US?
travel.stackexchange.com
26
Can my mom travel to the US with a green card if it’s been over a year since her last entry due to COVID?
expatriates.stackexchange.com
26
Is the "Visa Waiver Program Improvement and Terrorist Travel Prevention Act" already valid?
travel.stackexchange.com
25
Foreign driver gets a ticket in my car
travel.stackexchange.com
25
Can my mom travel to the US with a green card if it’s been over a year since her last entry due to COVID?
travel.stackexchange.com
25
Overstayed my US visa for over 9 years, never got deported, can I return as a tourist?
travel.stackexchange.com
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