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How to access maven.build.timestamp for resource filtering
...t was one of the reasons why I abandoned eclipse integration and use maven from command line.
– kostja
Mar 1 '13 at 13:32
1
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How to access the correct `this` inside a callback?
...ructor function
new foo(); // `this` will refer to an object that inherits from `foo.prototype`
To learn more about this, have a look at the MDN documentation.
How to refer to the correct this
Use arrow functions
ECMAScript 6 introduced arrow functions, which can be thought of as lambda functions....
Is there a JavaScript / jQuery DOM change listener?
...
Here’s a browser compatibility table from Can I Use.
– bdesham
Jul 8 '14 at 14:47
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show 3 more commen...
Simple way to create matrix of random numbers
... Create an array of the given shape and propagate it with random
samples from a uniform distribution over [0, 1).
>>> import numpy as np
>>> np.random.rand(2,3)
array([[ 0.22568268, 0.0053246 , 0.41282024],
[ 0.68824936, 0.68086462, 0.6854153 ]])
...
Cannot use object of type stdClass as array?
... like this:
var_dump($result->context);
If you have identifiers like from-date (the hyphen would cause a PHP error when using the above method) you have to write:
var_dump($result->{'from-date'});
If you want an array you can do something like this:
$result = json_decode($json, true);
...
How to add pandas data to an existing csv file?
...g and closing your file multiple times, or logging data, statistics, etc.
from contextlib import contextmanager
import pandas as pd
@contextmanager
def open_file(path, mode):
file_to=open(path,mode)
yield file_to
file_to.close()
##later
saved_df=pd.DataFrame(data)
with open_file('y...
How do I initialize an empty array in C#?
... items without specifying the size OR type, the compiler will infer either from the initializer: var a = new []{"a", "b", "c"}; This is still a strongly typed string array.
– Nick VanderPyle
Jan 4 '12 at 14:12
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vs in Generics
...sn't covariant, even though logically it should work, since string derives from object. Before variance in generic interfaces was added to C# and VB.NET (in .NET 4 with VS 2010), this was a compile time error.
After .NET 4, IEnumerable<T> was marked covariant, and became IEnumerable<out T...
Why is processing a sorted array faster than processing an unsorted array?
...less.
Further reading: "Branch predictor" article on Wikipedia.
As hinted from above, the culprit is this if-statement:
if (data[c] >= 128)
sum += data[c];
Notice that the data is evenly distributed between 0 and 255. When the data is sorted, roughly the first half of the iterations will no...
Changing ImageView source
...Id(R.id.ImageView1)).setImageResource(0);
now this will delete the image from your image view, because it has set the resources value to zero.
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