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Does Typescript support the ?. operator? (And, what's it called?)
...rator (specifically, the "accessor variant" of the existential operator).
From CoffeeScript's documentation on Operators:
The accessor variant of the existential operator ?. can be used to soak up null references in a chain of properties. Use it instead of the dot accessor . in cases where the ...
How to display all methods of an object?
...-in, they're defined by the browser and most likely enumerable by design.
From ECMA-262 Edition 3:
Global Object
There is a unique global
object (15.1), which is created before
control enters any execution context.
Initially the global object has the
following properties:
• B...
How to display the current year in a Django template?
...ration year dropdown with 20 values (starting with the current year). The select values needed to be 2 digits and the display strings 4 digits. To avoid complex template code, I wrote this simple template tag:
@register.filter
def add_current_year(int_value, digits=4):
if digits == 2:
...
Secondary axis with twinx(): how to add to legend?
...o something like this:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import rc
rc('mathtext', default='regular')
time = np.arange(10)
temp = np.random.random(10)*30
Swdown = np.random.random(10)*100-10
Rn = np.random.random(10)*100-10
fig = plt.figure()
ax = fig.add_subplot(1...
How can I use “sizeof” in a preprocessor macro?
...s p__LINE__ as a variable. You would need a preproc macro and use __CONCAT from sys/cdefs.h .
– Coroos
Mar 2 at 11:37
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Add MIME mapping in web.config for IIS Express
...ble-click the "MIME Types" configuration option while having IIS root node selected in the left panel and click "Add..." link in the Actions panel on the right. This will bring up the following dialog. Add .woff file extension and specify "application/x-font-woff" as the corresponding MIME type:
...
How dangerous is it to compare floating point values?
...
[The 'right answer' glosses over selecting K. Selecting K ends up being just as ad-hoc as selecting VISIBLE_SHIFT but selecting K is less obvious because unlike VISIBLE_SHIFT it is not grounded on any display property. Thus pick your poison - select K or s...
Is there an eval() function in Java? [duplicate]
... Java class or method that will do what you want. Your options include:
Select and use some third-party expression evaluation library. For example JEL or any of the half dozen libraries listed here.
Wrap the expression in the Java source code for a class with an eval method, send that to the Jav...
How to get a vertical geom_vline to an x-axis of class date?
... POSIXct and geom_vline , I could not get it done. I have a time series from and would like to draw a vertical line for years 1998, 2005 and 2010 for example. I tried with ggplot and qplot syntax, but still I either see no vertical line at all or the vertical line is drawn at the very first v...
How to evaluate a math expression given in string form?
I'm trying to write a Java routine to evaluate math expressions from String values like:
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