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JavaScript checking for null vs. undefined and difference between == and ===
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123
To distill TJ's answer, === means value AND type are the same.
– Slappy
Feb 24 '11 at 8:48
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What's the best way to put a c-struct in an NSArray?
...structure myStruct is created on the stack and hence is destroyed when the function ends -- the array will contain a pointer to an object that is no longer there. You can work around this by using your own memory management routines -- hence why the option is provided to you -- but then you have to ...
C++ templates Turing-complete?
...cout << Factorial<4>::val << "\n";
}
That was a little fun but not very practical.
To answer the second part of the question:
Is this fact useful in practice?
Short Answer: Sort of.
Long Answer: Yes, but only if you are a template daemon.
To turn out good programming using t...
How to “perfectly” override a dict?
...AaronHall that was made 10 times easier.
class CIstr(unicode):
"""See https://stackoverflow.com/a/43122305/281545, especially for inlines"""
__slots__ = () # does make a difference in memory performance
#--Hash/Compare
def __hash__(self):
return hash(self.lower())
def _...
TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...设的家庭网络
call WiFi1.ConnectSSID "HomeNetwork_5G", "password123"
// 连接成功后控制设备
when WiFi1.AfterWifiNegotiation ssid, success
do
if success and ssid = "HomeNetwork_5G" then
call InitializeSmartDevices
3. 网络诊断工具
检查网...
Why is the asterisk before the variable name, rather than after the type?
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123
If you look at it another way, *myVariable is of type int, which makes some sense.
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Avoid trailing zeroes in printf()
...}
}
If you're not happy with the truncation aspect (which would turn 0.12399 into 0.123 rather than rounding it to 0.124), you can actually use the rounding facilities already provided by printf. You just need to analyse the number before-hand to dynamically create the widths, then use those to ...
Change default global installation directory for node.js modules in Windows?
... edited May 20 at 14:09
gls123
4,89922 gold badges2424 silver badges2626 bronze badges
answered Jan 19 '15 at 17:05
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How to write very long string that conforms with PEP8 and prevent E501
...t will result in a tuple, not a string. ;)
– bugmenot123
Sep 18 '15 at 13:00
7
Isn't adding the +...
Avoiding SQL injection without parameters
... lot of i18n issues with dates/numbers; what date is 01/02/03? How much is 123,456? Do your servers (app-server and db-server) agree with each-other?
If the risk factor isn't convincing to them, how about performance? The RDBMS can re-use the query plan if you use parameters, helping performance. I...