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Why does base64 encoding require padding if the input length is not divisible by 3?
...ence is lost. However, if padded sequences are used, there's no ambiguity, and the sequence as a whole can be decoded correctly.
Edit: An Illustration
Suppose we have a program that base64-encodes words, concatenates them and sends them over a network. It encodes "I", "AM" and "TJM", sandwiches th...
What happens with constraints when a view is removed
...y the poster in that question did what he did. I've logged this to verify, and when I remove a subview, and check the constraints on the superview, those constraints that pertained to the removed subview are gone.
– rdelmar
Apr 22 '14 at 15:18
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Can I get the name of the current controller in the view?
... Guides, it says:
The params hash will always contain the :controller and :action keys, but you should use the methods controller_name and action_name instead to access these values
ActionController Parameters
So let's say you have a CSS class active , that should be inserted in any link who...
SQL standard to escape column names?
Is there a SQL standard to escape a column name? If not what works for MySQL and SQLite? does it also work for SQL Server?
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How to convert a selection to lowercase or uppercase in Sublime Text
I have several strings selected in a file in Sublime Text and I want to convert them all to lowercase.
5 Answers
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Difference between Pragma and Cache-Control headers?
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Pragma is the HTTP/1.0 implementation and cache-control is the HTTP/1.1 implementation of the same concept. They both are meant to prevent the client from caching the response. Older clients may not support HTTP/1.1 which is why that header is still in use.
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How to extract a string using JavaScript Regex?
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You need to use the m flag:
multiline; treat beginning and end characters (^ and $) as working
over multiple lines (i.e., match the beginning or end of each line
(delimited by \n or \r), not only the very beginning or end of the
whole input string)
Also put the * in the r...
Performance - Date.now() vs Date.getTime()
.../date it's been set to). That is, if you do this:
var now = new Date();
and then wait a while, a subsequent call to now.getTime() will tell the time at the point the variable was set.
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imp...
Return type of '?:' (ternary conditional operator)
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Expressions don't have return types, they have a type and - as it's known in the latest C++ standard - a value category.
A conditional expression can be an lvalue or an rvalue. This is its value category. (This is somewhat of a simplification, in C++11 we have lvalues, xvalues a...
Print function log /stack trace for entire program using firebug
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Firefox provides console.trace() which is very handy to print the call stack. It is also available in Chrome and IE 11.
Alternatively try something like this:
function print_call_stack() {
var stack = new Error().stack;
console.log("PRINTING CALL STACK");
console....