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How does the NSAutoreleasePool autorelease pool work?
... the drain/release confusion:
int main(void) {
@autoreleasepool {
NSString *string;
string = [[[NSString alloc] init] autorelease];
/* use the string */
}
}
In the example above please note the @autoreleasepool block. This is documented here.
...
node.js shell command execution
...can be called multiple times, and 2) the callback is given a buffer, not a string. Easy to remedy; just change
foo = new run_cmd(
'netstat.exe', ['-an'], function (me, data){me.stdout=data;}
);
into
foo = new run_cmd(
'netstat.exe', ['-an'], function (me, buffer){me.stdout+=buffer.toStri...
Displaying the build date
...urces\BuildDate.txt"
Add this file as resource,
now you have 'BuildDate' string in your resources.
To create resources, see How to create and use resources in .NET.
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top -c command in linux to filter processes listed based on processname
... pgrep to get pid's of matching command lines:
top -c -p $(pgrep -d',' -f string_to_match_in_cmd_line)
top -p expects a comma separated list of pids so we use -d',' in pgrep. The -f flag in pgrep makes it match the command line instead of program name.
...
Are empty HTML5 data attributes valid?
... that empty attribute syntax is exactly equivalent to specifying the empty string as the value for the attribute, as in the following example.
<input disabled="">
So you are allowed to use empty custom data attributes, but special handling is needed to use them as boolean.
When you are acces...
System.Net.WebException HTTP status code
...t ex.Status to get the WebExceptionStatus.
If you just want a descriptive string to log in case of a failure you can use the null-coalescing operator (??) to get the relevant error:
string status = (ex.Response as HttpWebResponse)?.StatusCode.ToString()
?? ex.Status.ToString();
If the except...
How to clear Facebook Sharer cache?
...u're still having trouble getting it to refresh, try adding a random query string parameter to the end of your URL.
– JD Smith
Jul 24 '14 at 15:40
2
...
if/else in a list comprehension
...1.5, 2.3, 4.4, 5.4, 'n', 1.5, 5.1, 'a'] # Original list
# Extract non-strings from X to new list
X_non_str = [el for el in X if not isinstance(el, str)] # When using only 'if', put 'for' in the beginning
# Change all strings in X to 'b', preserve everything else as is
X_str_changed = ['b' if ...
Convert NaN to 0 in javascript
... value to 0.
The "falsey" values are:
false
null
undefined
0
"" ( empty string )
NaN ( Not a Number )
Or this if you prefer:
a = a ? a : 0;
...which will have the same effect as above.
If the intent was to test for more than just NaN, then you can do the same, but do a toNumber conversi...
VB.NET equivalent to C# var keyword [duplicate]
...licitly (like the C# var) keyword.
Dim foo = "foo"
foo is declared as a String.
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