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Cache Invalidation — Is there a General Solution?
...h can be modified outside of it's control.
If you have an idempotent function from a, b to c where, if a and b are the same then c is the same but the cost of checking b is high then you either:
accept that you sometime operate with out of date information and do not always check b
do your level ...
Algorithm to generate all possible permutations of a list?
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Basically, for each item from left to right, all the permutations of the remaining items are generated (and each one is added with the current elements). This can be done recursively (or iteratively if you like pain) until the last item is reached at which point there is only one possi...
how to permit an array with strong parameters
I have a functioning Rails 3 app that uses has_many :through associations which is not, as I remake it as a Rails 4 app, letting me save ids from the associated model in the Rails 4 version.
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Passing arguments forward to another javascript function
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Use .apply() to have the same access to arguments in function b, like this:
function a(){
b.apply(null, arguments);
}
function b(){
alert(arguments); //arguments[0] = 1, etc
}
a(1,2,3);
You can test it out here.
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What does java.lang.Thread.interrupt() do?
... consume the interrupted status immediately and throw an appropriate exception (usually InterruptedException)
Interruption in Java is not pre-emptive. Put another way both threads have to cooperate in order to process the interrupt properly. If the target thread does not poll the interrupted stat...
Is there any JSON Web Token (JWT) example in C#?
I feel like I'm taking crazy pills here. Usually there's always a million library and samples floating around the web for any given task. I'm trying to implement authentication with a Google "Service Account" by use of JSON Web Tokens (JWT) as described here .
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CSS Selector for
...target all inputs based on their type? I have a disabled class I use on various disabled form elements, and I'm setting the background color for text boxes, but I don't want my checkboxes to get that color.
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How to use regex in String.contains() method in Java
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String.contains
String.contains works with String, period. It doesn't work with regex. It will check whether the exact String specified appear in the current String or not.
Note that String.contains does not check for word boundary; it simply checks for substring.
Regex soluti...
trying to animate a constraint in swift
...p the constraints and made sure the constraint on the left has the lower priority then the one that I am trying to animate on the right side.
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Configuring so that pip install can work from github
We'd like to use pip with github to install private packages to our production servers. This question concerns what needs to be in the github repo in order for the install to be successful.
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