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What is the best method of handling currency/money?
...e calculation.
If you insist on using integers, you will have to manually convert to and from BigDecimals everywhere, which will probably just become a pain.
As pointed out by mcl, to print the price, use:
number_to_currency(price, :unit => "€")
#=> €1,234.01
...
How do I save a UIImage to a file?
...pp. You use NSFileManager to do that.
You use UIImagePNGRepresentation to convert your image to NSData and save that to disk.
// Create path.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppe...
Why does ('0' ? 'a' : 'b') behave different than ('0' == true ? 'a' : 'b') [duplicate]
... return the result of the comparison x == ToNumber(y).
When booleans are converted to numbers, the following conversion takes place:
Boolean: The result is 1 if the argument is true. The result is +0 if the argument is false.
Now we have
'0' == 1
which matches the condition in step 5:
...
What does .SD stand for in data.table in R
...
Edit:
Given how well-received this answer was, I've converted it into a package vignette now available here
Given how often this comes up, I think this warrants a bit more exposition, beyond the helpful answer given by Josh O'Brien above.
In addition to the Subset of the D...
Is Python interpreted, or compiled, or both?
...tion to native machine code. A compiler is, more generally, a program that converts a program in one programming language into a program in another programming language (arguably, you can even have a compiler with the same input and output language if significant transformations are applied). And JI...
How to use the 'sweep' function
...,sd))
df_T=sweep(sweep(df,2,df_means,"-"),2,df_sds,"/")*10+50
This code convert raw scores to T scores (with mean=50 and sd=10):
> df
[,1] [,2] [,3] [,4] [,5]
[1,] 109 8 89 69 15
[2,] 85 13 25 150 26
[3,] 30 79 48 1 125
[4,] 56 74 23 140 100
[5,] 136...
RGB to hex and hex to RGB
How to convert colors in RGB format to hex format and vice versa?
50 Answers
50
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Replace tabs with spaces in vim
I would like to convert tab to spaces in gVim. I added the following line to my _vimrc :
11 Answers
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How to handle click event in Button Column in Datagridview?
... an entire class, especially one that can be easily derived through a code converter. Sure, people will come here looking for c#, but they can crosswalk there themselves and aren't likely to browse the comments looking for an implementation anyway. I would (respectfully) suggest deleting your comm...
How does Google's Page Speed lossless image compression work?
...sion(0), alpha_filtering(1), alpha_quality(100) {}
There is also image_converter.cc which is used to losslessly convert to the smallest format.
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