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How to declare a type as nullable in TypeScript?
...r undefined.
You can make the field optional which is different from nullable.
interface Employee1 {
name: string;
salary: number;
}
var a: Employee1 = { name: 'Bob', salary: 40000 }; // OK
var b: Employee1 = { name: 'Bob' }; // Not OK, you must have 'salary'
var c: Employee1 = { name: 'B...
how to check the dtype of a column in python pandas
...treat numeric columns and string columns. What I am doing now is really dumb:
6 Answers
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Can a decorator of an instance method access the class?
I have something roughly like the following. Basically I need to access the class of an instance method from a decorator used upon the instance method in its definition.
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std::auto_ptr to std::unique_ptr
With the new standard coming (and parts already available in some compilers), the new type std::unique_ptr is supposed to be a replacement for std::auto_ptr .
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socket.shutdown vs socket.close
I recently saw a bit of code that looked like this (with sock being a socket object of course):
7 Answers
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Inserting a PDF file in LaTeX
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IcyFlame
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answered Apr 29 '10 at 18:16
MicaMica
...
ruby convert array into function arguments
... the * (or "splat") operator:
a = [0, 1, 2, 3, 4] # => [0, 1, 2, 3, 4]
b = [2, 3] # => [2, 3]
a.slice(*b) # => [2, 3, 4]
Reference:
Array to Arguments Conversion
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Notification click: activity already open
...notification and the activity is already opened, it's not started again, but just brought to front.
6 Answers
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How do I remove duplicate items from an array in Perl?
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You can do something like this as demonstrated in perlfaq4:
sub uniq {
my %seen;
grep !$seen{$_}++, @_;
}
my @array = qw(one two three two three);
my @filtered = uniq(@array);
print "@filtered\n";
Outputs:
one two three
If you want to use a module, try the uniq function f...
Getting realtime output using subprocess
... display a nice progress indicator for the operation. This requires me to be able to see each line of output from the wrapped program as soon as it is output.
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