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How to get a specific output iterating a hash in Ruby?
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Regarding order I should add, that in 1.8 the items will be iterated in random order (well, actually in an order defined by Fixnum's hashing function), while in 1.9 it will be iterated in the order of the literal.
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Delete from the current cursor position to a given line number in vi editor
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To delete from a to b use
:a,bd
from current to b use
:,bd
(where a and b in code are replaced by your numbers)
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Undo scaffolding in Rails
Is there any way to 'undo' the effects of a scaffold command in Rails?
24 Answers
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Django template how to look up a dictionary value with a variable
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Fetch both the key and the value from the dictionary in the loop:
{% for key, value in mydict.items %}
{{ value }}
{% endfor %}
I find this easier to read and it avoids the need for special coding. I usually need the key and the value in...
How do you explicitly set a new property on `window` in TypeScript?
...ate .d.ts file. It does not work when used in a .ts file that uses imports and exports itself. See this answer.
– cdauth
Mar 9 '16 at 14:21
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:: (double colon) operator in Java 8
I was exploring the Java 8 source and found this particular part of code very surprising:
17 Answers
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Convert Bitmap to File
I understand that using BitmapFactory can convert a File to a Bitmap, but is there any way to convert a Bitmap image to a File?
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What do two question marks together mean in C#?
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It's the null coalescing operator, and quite like the ternary (immediate-if) operator. See also ?? Operator - MSDN.
FormsAuth = formsAuth ?? new FormsAuthenticationWrapper();
expands to:
FormsAuth = formsAuth != null ? formsAuth : new FormsAuthenticationWr...
How to convert SecureString to System.String?
...you can access the raw data using Marshal.ReadInt16(IntPtr, Int32):
void HandleSecureString(SecureString value) {
IntPtr valuePtr = IntPtr.Zero;
try {
valuePtr = Marshal.SecureStringToGlobalAllocUnicode(value);
for (int i=0; i < value.Length; i++) {
short unicodeChar = Marshal....
Rails Model find where not equal
...is is the only refactor you are going to make, it is not worth using a gem and I would just stick with what you got. Squeel is useful in situations where you have many complex queries interacting with Ruby code.
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