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What is the best method of handling currency/money?
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add_column :items, :price, :decimal, :precision => 8, :scale => 2
In Rails, the :decimal type is returned as BigDecimal, which is great for price calculation.
If you insist on using integers, you will have to manually convert to and from BigDecimals everywhere, which will probably just...
RegEx to parse or validate Base64 data
... words, you can use the following:
^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$
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Which version of Python do I have installed?
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How to concatenate items in a list to a single string?
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edited Sep 17 '12 at 5:48
answered Sep 17 '12 at 5:33
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Get Substring - everything before certain char
...ram
{
static void Main(string[] args)
{
Console.WriteLine("223232-1.jpg".GetUntilOrEmpty());
Console.WriteLine("443-2.jpg".GetUntilOrEmpty());
Console.WriteLine("34443553-5.jpg".GetUntilOrEmpty());
Console.ReadKey();
}
}
static class Helper
{
public ...
Library not loaded: /usr/local/opt/readline/lib/libreadline.6.2.dylib
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What is the difference between Θ(n) and O(n)?
... Ω(g(x))
Basically when we say an algorithm is of O(n), it's also O(n2), O(n1000000), O(2n), ... but a Θ(n) algorithm is not Θ(n2).
In fact, since f(n) = Θ(g(n)) means for sufficiently large values of n, f(n) can be bound within c1g(n) and c2g(n) for some values of c1 and c2, i.e. the grow...
App Inventor 2 物联网入门的两个方向：BLE直连硬件 vs MQTT云端通信，你的...
...制家里的灯，该用蓝牙还是WiFi？"
这是 App Inventor 2 中文网社区里被反复问到的问题。很多初次接触物联网的开发者，以为物联网就是"让手机连上硬件"，结果买错了模块、选错了方案，项目卡在一半。
其实对 App ...
How to reset or change the MySQL root password?
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AngularJS ng-style with a conditional expression
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As @Yoshi said, from angular 1.1.5 you can use-it without any change.
If you use angular < ...