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A positive lambda: '+[]{}' - What sorcery is this? [duplicate]
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Yes, the code is standard conforming. The + triggers a conversion to a plain old function pointer for the lambda.
What happens is this:
The compiler sees the first lambda ([]{}) and generates a closure object according to §5.1.2. As the lambda is a non-c...
Access Enum value using EL with JSTL
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A simple comparison against string works:
<c:when test="${someModel.status == 'OLD'}">
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Nodejs cannot find installed module on Windows
... with npm.cmd, and nodejs failed to find the installed modules. Take jade for example,
19 Answers
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How to install a node.js module without using npm?
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Is it possible to import a script from an external URL (like var myscript = require("http://www.mywebsite.com/myscript.js"))? It looks like the require function doesn't work for external URLs.
– Anderson Green
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How to pass a user defined argument in scrapy spider
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Spider arguments are passed in the crawl command using the -a option. For example:
scrapy crawl myspider -a category=electronics -a domain=system
Spiders can access arguments as attributes:
class MySpider(scrapy.Spider):
name = 'myspider'
def __init__(self, category='', **kwargs):
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how do I check in bash whether a file was created more than x time ago?
I want to check in linux bash whether a file was created more than x time ago.
8 Answers
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How to stop EditText from gaining focus at Activity startup in Android
...de="true" and android:focusable="true" to parent layout (e.g. LinearLayout or ConstraintLayout) like the following example will fix the problem.
<!-- Dummy item to prevent AutoCompleteTextView from receiving focus -->
<LinearLayout
android:focusable="true"
android:focusableInTouch...
How can I save an image with PIL?
...g using the Python image library (PIL) using a post I found earlier to perform fourier transforms of images and I can't get the save function to work. The whole code works fine but it just wont save the resulting image:
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Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence
... json.dump("ברי צקלה", json_file, ensure_ascii=False)
Caveats for Python 2
For Python 2, there are some more caveats to take into account. If you are writing this to a file, you can use io.open() instead of open() to produce a file object that encodes Unicode values for you as you write...
What does “&” at the end of a linux command mean?
I am a system administrator and I have been asked to run a linux script to clean the system.
4 Answers
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