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p vs puts in Ruby
... on a new line. Each given object
that isn’t a string or array will be converted by calling its to_s
method. If called without arguments, outputs a single newline.
let's try it on irb
# always newline in the end
>> puts # no arguments
=> nil # return nil and writes a newline
>...
How to find the sum of an array of numbers
...resentation of JavaScript code. Using the Array.prototype.join function to convert the array to a string, we change [1,2,3] into "1+2+3", which evaluates to 6.
console.log(
eval([1,2,3].join('+'))
)
//This way is dangerous if the array is built
// from user input as it may be exploited ...
How to get instance variables in Python?
...
Every object has a __dict__ variable containing all the variables and its values in it.
Try this
>>> hi_obj = hi()
>>> hi_obj.__dict__.keys()
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Ternary Operators in JavaScript Without an “Else”
...
> Returns expr1 if it can be converted to true; otherwise, returns expr2. Logical Operators (MDN)
– Szabolcs Páll
Sep 30 '15 at 10:00
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How can I create a simple message box in Python?
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You could use an import and single line code like this:
import ctypes # An included library with Python install.
ctypes.windll.user32.MessageBoxW(0, "Your text", "Your title", 1)
Or define a function (Mbox) like so:
import ctypes # An inclu...
How do I check (at runtime) if one class is a subclass of another?
Let's say that I have a class Suit and four subclasses of suit: Heart, Spade, Diamond, Club.
9 Answers
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Position a CSS background image x pixels from the right?
... @ValentinE that works for me too :-) I definitely saw this converted to 90% though - and I had cut and pasted this directly from chrome. unless there was a strange bug in a dev build of chrome I'm not sure why
– Simon_Weaver
Jul 29 '14 at 19:06
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Python (and Python C API): __new__ versus __init__
...stion I'm about to ask seems to be a duplicate of Python's use of __new__ and __init__? , but regardless, it's still unclear to me exactly what the practical difference between __new__ and __init__ is.
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How to go back to previous page if back button is pressed in WebView?
...bView:
private WebView mWebView;
Initialize it in the onCreate() method and you should be good to go.
mWebView = (WebView) findViewById(R.id.webView);
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When exactly is it leak safe to use (anonymous) inner classes?
I have been reading some articles on memory leaks in Android and watched this interesting video from Google I/O on the subject .
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