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How to write a simple Html.DropDownListFor()?
...like to write a very simple dropdown list which gives static options. For example I'd like to provide choices between "Red", "Blue", and "Green".
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parseInt vs unary plus, when to use which?
... //true
isNaN(+'2a'); //true
As seen in the comment of @Alex K., parseInt and parseFloat will parse by character. This means hex and exponent notations will fail since the x and e are treated as non-numerical components (at least on base10).
The unary + will convert them properly tho...
How do I check if the Java JDK is installed on Mac?
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However, if Java isn't installed, a dialog box will appear telling you that Java needs to be installed, so this isn't a good option for scripts.
– a paid nerd
Jan 5 '16 at 18:15
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Multidimensional Array [][] vs [,] [duplicate]
... the latter is uniform.
That is, a double[][] can validly be:
double[][] x = new double[5][];
x[0] = new double[10];
x[1] = new double[5];
x[2] = new double[3];
x[3] = new double[100];
x[4] = new double[1];
Because each entry in the array is a reference to an array of double. With a jagged arra...
Find intersection of two nested lists?
...8], [1,6]]
Then here is your solution for Python 2:
c3 = [filter(lambda x: x in c1, sublist) for sublist in c2]
In Python 3 filter returns an iterable instead of list, so you need to wrap filter calls with list():
c3 = [list(filter(lambda x: x in c1, sublist)) for sublist in c2]
Explanation:...
Single Line Nested For Loops
Wrote this function in python that transposes a matrix:
5 Answers
5
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Returning the product of a list
... With python 2.7.5
from operator import mul
import numpy as np
import numexpr as ne
# from functools import reduce # python3 compatibility
a = range(1, 101)
%timeit reduce(lambda x, y: x * y, a) # (1)
%timeit reduce(mul, a) # (2)
%timeit np.prod(a) # (3)
%ti...
How to set or change the default Java (JDK) version on OS X?
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First run /usr/libexec/java_home -V which will output something like the following:
Matching Java Virtual Machines (3):
1.8.0_05, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home
1.6.0_65-b14-462, x86_64: ...
A CORS POST request works from plain JavaScript, but why not with jQuery?
...t was the case for me in FF 4.0 & Chrome 10.0.648.204).
jQuery's $.ajax method sends the "x-requested-with" header for all cross domain requests (i think its only cross domain).
So the missing header needed to respond to the OPTIONS request is:
//no longer needed as of jquery 1.5.2
Access-Con...
What is the difference between '/' and '//' when used for division?
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In Python 3.x, 5 / 2 will return 2.5 and 5 // 2 will return 2. The former is floating point division, and the latter is floor division, sometimes also called integer division.
In Python 2.2 or later in the 2.x line, there is no differe...