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What is a “feature flag”?
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A 'feature flag' (or Feature Toggle) is the ability to turn features (sub-sections) of your application on/off at easily:
perhaps via a re-deploy, or
some internal page where pages/features can be toggled live.
I guess the example there w...
For-each over an array in JavaScript
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TL;DR
Don't use for-in unless you use it with safeguards or are at least aware of why it might bite you.
Your best bets are usually
a for-of loop (ES2015+ only),
Array#forEach (spec | MDN) (or its relatives some and such) (ES5+ only),
a sim...
REST API Best practices: Where to put parameters? [closed]
...d to be easier to put in the query string.
If you want to return a 404 error when the parameter value does not correspond to an existing resource then I would tend towards a path segment parameter. e.g. /customer/232 where 232 is not a valid customer id.
If however you want to return an empty list...
How do I capture response of form.submit
...ou won't be able to do this easily with plain javascript. When you post a form, the form inputs are sent to the server and your page is refreshed - the data is handled on the server side. That is, the submit() function doesn't actually return anything, it just sends the form data to the server.
If ...
Is gcc 4.8 or earlier buggy about regular expressions?
...ng to use std::regex in a C++11 piece of code, but it appears that the support is a bit buggy. An example:
3 Answers
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How to check if an object is a list or tuple (but not string)?
This is what I normally do in order to ascertain that the input is a list / tuple - but not a str . Because many times I stumbled upon bugs where a function passes a str object by mistake, and the target function does for x in lst assuming that lst is actually a list or tuple .
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How can I quantify difference between two images?
... and calculate an element-wise (pixel-by-pixel) difference. Calculate the norm of the difference.
Option 2: Load both images. Calculate some feature vector for each of them (like a histogram). Calculate distance between feature vectors rather than images.
However, there are some decisions to make ...
Why does JQuery have dollar signs everywhere?
I am working on a project with quite a lot of JQuery in it. The JQuery has a lot of $ signs everywhere, for example
7 Answ...
How to use double or single brackets, parentheses, curly braces
...eses, curly braces in Bash, as well as the difference between their double or single forms. Is there a clear explanation?
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When should we call System.exit in Java
In Java, What is the difference with or without System.exit(0) in following code?
10 Answers
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