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Test for existence of nested JavaScript object key
...9-10-17:
The optional chaining proposal reached Stage 3 on the ECMAScript committee process, this will allow you to safely access deeply nested properties, by using the token ?., the new optional chaining operator:
const value = obj?.level1?.level2?.level3
If any of the levels accessed is null ...
How do I pass JavaScript variables to PHP?
...ax (several posts are on here about that) (without a page refresh)
Make an HTTP request via an XMLHttpRequest request (without a page refresh) like this:
if (window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest();
}
else{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
var Pa...
What is the purpose of double curly braces in React's JSX syntax?
...
@Brian: See github.com/facebook/react/issues/2256#issuecomment-63031960 (and github.com/facebook/react/blob/…).
– Felix Kling
Mar 1 '15 at 21:13
...
How can I call controller/view helper methods from the console in Ruby on Rails?
...myresource_path # => "/myresource"
app.myresource_url # => "http://www.example.com/myresource"
View Helpers:
foo = ActionView::Base.new
foo.javascript_include_tag 'myscript' #=> "<script src=\"/javascripts/myscript.js\"></script>"
helper.link_to "foo", "bar" #=>...
Android: How to put an Enum in a Bundle?
...es not scale to arrays of things that contain enum, etc. See stackoverflow.com/a/5551155/175156
– yincrash
Jun 18 '14 at 19:30
1
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Accessing dict keys like an attribute?
...ute correctly raises AttributeError instead of KeyError
Supports [Tab] autocompletion (e.g. in jupyter & ipython)
Cons:
Methods like .keys() will not work just fine if they get overwritten by incoming data
Each AttrDict instance actually stores 2 dictionaries, one inherited and another one in ...
How can I distribute python programs?
...be mistaken, but doesn't IronPython have a built in compiler for windows?
http://www.ironpython.net
[EDIT]
Try out Cx_Freeze, By far the best .py to .exe (plus a few .dlls) compiler I've ever used.
http://cx-freeze.sourceforge.net/
...
Python: Why is functools.partial necessary?
..... you end up "faking assignments within an expression" by stretching list comprehension well beyond its design limits...:
>>> f = [f for f in (lambda f: int(s, base=2),)
if setattr(f, 'keywords', {'base': 2}) is None][0]
Now combine the named-arguments overridability, plus th...
Lazy Method for Reading Big File in Python?
I have a very big file 4GB and when I try to read it my computer hangs.
So I want to read it piece by piece and after processing each piece store the processed piece into another file and read next piece.
...
How to convert a String to its equivalent LINQ Expression Tree?
...f the Parser[List[String]] type.
More details are at the following link:
http://nicolaecaralicea.blogspot.ca/2013/04/scala-dsl-for-parsing-and-evaluating-of.html
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