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How to play with Control.Monad.Writer in haskell?
...writer monad. If you wanted two layers transformers (say you wanted to add error handling as well) then you'd need to use lift $ lift $ tell w. This quickly gets unwieldy.
Instead, by defining a type class we can make any monad transformer wrapper around a writer into an instance of writer itself. ...
Assign pandas dataframe column dtypes
...e types explicitly with pandas DataFrame.astype(dtype, copy=True, raise_on_error=True, **kwargs) and pass in a dictionary with the dtypes you want to dtype
here's an example:
import pandas as pd
wheel_number = 5
car_name = 'jeep'
minutes_spent = 4.5
# set the columns
data_columns = ['wheel_number...
Why java.lang.Object is not abstract? [duplicate]
... abstract is that it cannot be constructed (i.e. new Object() is a compile error). Would this have a benefit? I'm of the opinion that the term "object" is itself abstract (can you find anything around you which can be totally described as "an object"?), so it would fit with the object-oriented parad...
Can I change the viewport meta tag in mobile safari on the fly?
... For the content attributes, mobile safari's web inspector is throwing an error on the semicolons. This appears to be more valid: viewport.setAttribute('content', 'width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0');
– jfroom
Oct 24 '12...
Perl flags -pe, -pi, -p, -w, -d, -i, -t?
...s certain "tainted" (dubious) code as warnings (proper
taint mode will error on this dubious code). Used to beef
up Perl security, especially when running code for other
users, such as setuid scripts or web stuff.
...
Function pointers, Closures, and Lambda
...mp;LessThan;
BOOL LessThan(int i) {
return i < lessThan; // compile error - lessThan is not in scope
}
though I could define a function pointer that takes 2 arguments:
int lessThan = 100;
BOOL (*lessThanTest)(int, int);
lessThanTest = &LessThan;
lessThanTest(99, lessThan); // returns ...
Cross browser JavaScript (not jQuery…) scroll to top animation
...
This throws an error in latest Chrome Uncaught TypeError: Failed to execute 'scroll' on 'Window': No function was found that matched the signature provided.
– rorymorris89
Sep 19 '17 at 11:18
...
Will the base class constructor be automatically called?
...ntract]
public abstract class DataModelBase : INotifyPropertyChanged, IDataErrorInfo {
#region Properties
[IgnoreDataMember]
public object Self {
get { return this; }
//only here to trigger change
set { OnPropertyChanged("Self"); }
}
#endregion Properti...
Can you list the keyword arguments a function receives?
... do stuff you might not have thought to do, like throw an appropriate type error on functions you can't inspect (eg. C functions).
– Brian
Aug 19 '14 at 16:14
...
Is it possible to set a custom font for entire of application?
...
Native typeface cannot be made error. Fixed, by adding fonts path. "FontsOverride.setDefaultFont(this, "DEFAULT", "fonts/MyFontAsset.ttf"); "
– Sai
Jan 10 '15 at 4:06
...