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Test if string is a number in Ruby on Rails
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Create is_number? Method.
Create a helper method:
def is_number? string
true if Float(string) rescue false
end
And then call it like this:
my_string = '12.34'
is_number?( my_string )
# => true
Extend String Class.
If yo...
Basic HTTP authentication with Node and Express 4
...substring(splitIndex + 1)
// using shorter regex by @adabru
// const [_, login, password] = strauth.match(/(.*?):(.*)/) || []
Basic auth in one statement
...on the other hand, if you only ever use one or very few logins, this is the bare minimum you need: (you don't even need to parse the cr...
Android multiple email attachments using Intent
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Downloading MySQL dump from command line
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Instead of using > to save, I rather use -r in order to prevent trouble with foreign characters, or that nightmare concerning encoding problems, as stated in this article.
– Pathros
Feb 7 '18 at 15:43
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Given two directory trees, how can I find out which files differ by content?
...-dereference --new-file --no-ignore-file-name-case /dir1 /dir2 > dirdiff_1.txt
rsync --recursive --delete --links --checksum --verbose --dry-run /dir1/ /dir2/ > dirdiff_2.txt
The choice between them depends on the location of dir1 and dir2:
When the directories reside on two seperate drive...
How to use gradle zip in local system without downloading when using gradle-wrapper
...utionUrl property in gradle-wrapper.properties to
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=gradle-1.11-bin.zip
Then, I made a copy of gradle-1.11-bin.zip in gradle/wrapper/.
Then, ./gradlew build do...
Ignoring new fields on JSON objects using Jackson [duplicate]
... this answer is very useful too in case one can't edit the MappingClass in order to add the annotation
– Neuro
May 30 '17 at 10:38
2
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How can I pad an int with leading zeros when using cout
...ename.fill('0'); filename.width(5); filename<<std::to_string(i);
– Prince Patel
Feb 25 '19 at 16:14
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show 2 more comm...
Image Segmentation using Mean Shift explained
...ing the mean
Please note that the algorithm is not well defined at the borders, so different implementations will give you different results there.
I'll NOT discuss the gory mathematical details here, as they are impossible to show without proper mathematical notation, not available in StackOv...
Chrome Development Tool: [VM] file from javascript
...en using eval, the javascript gets thrown into the Chrome Debugger VMs. In order to view js created with eval under Chrome Debugger Sources, set this attribute at the end (thanks Splaktar) of the js:
//@ sourceURL=dynamicScript.js
Is possible to debug dynamic loading JavaScript by some debugger l...