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The most accurate way to check JS object's type?
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The JavaScript specification gives exactly one proper way to determine the class of an object:
Object.prototype.toString.call(t);
http://bonsaiden.github.com/JavaScript-Garden/#types
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When should Flask.g be used?
...on context.
Every request pushes a new application context, wiping the old one, so g can still be used to set flags per-request without change to code.
The application context is popped after teardown_request is called. (Armin's presentation explains this is because things like creating DB connectio...
What should every developer know about databases? [closed]
...s developers either regularly work with databases or may have to work with one someday. And considering the amount of misuse and abuse in the wild, and the volume of database-related questions that come up every day, it's fair to say that there are certain concepts that developers should know - eve...
How to remove an element from a list by index
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a.pop(-1) to remove the last one?
– zx1986
Jul 30 '13 at 8:56
14
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Test if string is a guid without throwing exceptions?
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One even faster way is by using Guid.TryParseExact() method.
– user586254
Mar 30 '11 at 8:34
4
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What is the difference between background and background-color
...es the background-color, using the background shorthand you could also add one or more values without repeating any other background-* property more than once.
Which one to choose is essentially up to you, but it could also depend on specific conditions of your style declarations (e.g if you need t...
LINQ Aggregate algorithm explained
... on each element of the list taking into account the operations that have gone before. That is to say it performs the action on the first and second element and carries the result forward. Then it operates on the previous result and the third element and carries forward. etc.
Example 1. Summing num...
How can I check if a program exists from a Bash script?
...t or even hook into the package manager.
So, don't use which. Instead use one of these:
$ command -v foo >/dev/null 2>&1 || { echo >&2 "I require foo but it's not installed. Aborting."; exit 1; }
$ type foo >/dev/null 2>&1 || { echo >&2 "I require foo but it's not...
Git: How to reuse/retain commit messages after 'git reset'?
As Git user I regular come across the situation, that I need to rework one or more commits in a way which do not fit into --amend or rebase -i with fixup commits. Typically I would do something like
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rails - Devise - Handling - devise_error_messages
... when you're using devise it's already doing the validations you have mentioned without any extra code. Above solution is only to override default devise behavior. You have to have devise working in the first place. Are you sure if you have followed instructions to integrate devise with your project...