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Get index of array element faster than O(n)
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Convert the array into a hash. Then look for the key.
array = ['a', 'b', 'c']
hash = Hash[array.map.with_index.to_a] # => {"a"=>0, "b"=>1, "c"=>2}
hash['b'] # => 1
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Is there an online name demangler for C++? [closed]
I'm getting a fairly long and confusing link error, and would love it if I could just paste it into some textbox on some website and have the names un-mangled for me.
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How to save a dictionary to a file?
...n ndarray (doing a type(read_dictionary) reveals so) and .item() basically converts that element to a python scalar object which is a dictionary as stated here
– abhyudayasrinet
Sep 7 '18 at 0:42
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How To Save Canvas As An Image With canvas.toDataURL()?
... create a dummy HTML anchor, and download the image from there like...
// Convert canvas to image
document.getElementById('btn-download').addEventListener("click", function(e) {
var canvas = document.querySelector('#my-canvas');
var dataURL = canvas.toDataURL("image/jpeg", 1.0);
downl...
How to make the python interpreter correctly handle non-ASCII characters in string operations?
... If you are getting UnicodeDecodeError: 'ascii', then try to convert string into ''UTF-8' format before applying encoding function.
– Sateesh
May 14 at 8:06
add ...
What is a 'semantic predicate' in ANTLR?
...ng of at least
// one number, optionally followed by zero or more comma's and numbers
parse
: number (',' number)* EOF
;
// matches a number that is between 1 and 3 digits long
number
: Digit Digit Digit
| Digit Digit
| Digit
;
// matches a single digit
Digit
: '0'..'9'
;
//...
Best way to handle list.index(might-not-exist) in python?
...? :
li = [1,2,3,4,5] # create list
li = dict(zip(li,range(len(li)))) # convert List To Dict
print( li ) # {1: 0, 2: 1, 3: 2, 4:3 , 5: 4}
li.get(20) # None
li.get(1) # 0
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How can I iterate over files in a given directory?
...uffix == '.asm':
asm_pths.append(pth)
Path objects can easily be converted to strings.
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How to serialize a TimeSpan to XML
...pan is serializable, the XmlCustomFormatter does not provide methods to convert TimeSpan objects to and from XML.
12 A...
How can I find all of the distinct file extensions in a folder hierarchy?
...that it reverses the line and cuts the extension at the beginning.
It also converts the extensions to lower case.
Example output:
3689 jpg
1036 png
610 mp4
90 webm
90 mkv
57 mov
12 avi
10 txt
3 zip
2 ogv
1 xcf
1 trashinfo
1 sh
...