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How to check for an undefined or null variable in JavaScript?
...se
> Boolean(undefined) //false
all return false, which is similar to Python's check of empty variables.
So if you want to write conditional logic around a variable, just say
if (Boolean(myvar)){
// Do something
}
here "null" or "empty string" or "undefined" will be handled efficiently.
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How to import an existing X.509 certificate and private key in Java keystore to use in SSL?
...r (APR uses OpenSSL-like configuration, much
# easier than this) in server.xml looks like this
# (See: https://tomcat.apache.org/tomcat-6.0-doc/ssl-howto.html):
#
# <Connector port="8443" protocol="org.apache.coyote.http11.Http11Protocol"
# SSLEnabled="true"
# maxT...
How to maximize the browser window in Selenium WebDriver (Selenium 2) using C#?
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Java
driver.manage().window().maximize();
Python
driver.maximize_window()
Ruby
@driver.manage.window.maximize
OR
max_width, max_height = driver.execute_script("return [window.screen.availWidth, window.screen.availHeight];")
@driver.manage.window.resize_to(max_widt...
Date ticks and rotation in matplotlib
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I just tested with python3.6 and matplotlib v2.2.2 and it works too.
– Pablo Reyes
Apr 4 '19 at 23:35
add a comment
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What is Clojure useful for? [closed]
...r academically and professionally - C, C++, Objective-C, Java, JavaScript, Python, Ruby.
Which isn't to say Clojure is perfect. But it seems to me that it's built on a better foundation than most of what's out there.
share
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Catch-22 prevents streamed TCP WCF service securable by WIF; ruining my Christmas, mental health
...ore it can actually close out the message with the usual hash function and xml signature required by ws-security. If it has to read the entire stream to sign the single message (which is not really a message, but it's a single continuous stream) then you can see the problem here. WCF will have to st...
UITableview: How to Disable Selection for Some Rows but Not Others
I am displaying in a group tableview contents parsed from XML. I want to disable the click event on it (I should not be able to click it at all) The table contains two groups. I want to disable selection for the first group only but not the second group. Clicking the first row of second group nav...
What do querySelectorAll and getElementsBy* methods return?
...of DOM elements and is available in any DOM, not just an HTML DOM (e.g. an XML DOM), whereas an HTMLCollection is for HTML DOMs (obviously). The only difference I can see is the namedItem method of an HTMLCollection.
– RobG
Nov 18 '19 at 3:06
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What is a coroutine?
...etween two different routines without returning.
The 'yield' statement in Python is a good example. It creates a coroutine. When the 'yield ' is encountered the current state of the function is saved and control is returned to the calling function. The calling function can then transfer execution b...
Find element's index in pandas Series
... find an answer. How can I get the index of certain element of a Series in python pandas? (first occurrence would suffice)
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