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Difference between this and self in self-type annotations?
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182
All three forms are valid, and have the effect that B is assumed as the type of this in class A...
How do I find the last occurrence of a substring in an NSString?
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281
Use rangeOfString:options:, including NSBackwardsSearch in the options.
[@"abc def ghi abc def...
What is the best method of handling currency/money?
...of the decimal point
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 wi...
What would cause an algorithm to have O(log log n) complexity?
...his by 2 until we get down to 1? If we do this, we get
65,536 / 2 = 32,768
32,768 / 2 = 16,384
16,384 / 2 = 8,192
8,192 / 2 = 4,096
4,096 / 2 = 2,048
2,048 / 2 = 1,024
1,024 / 2 = 512
512 / 2 = 256
256 / 2 = 128
128 / 2 = 64
64 / 2 = 32
32 / 2 = 16
16 / 2 = 8
8 / 2 = 4
4 / 2 = 2
2 / 2 = 1
This pr...
How to fix Error: laravel.log could not be opened?
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Hamid ParchamiHamid Parchami
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IntelliJ: Never use wildcard imports
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869
It's obvious why you'd want to disable this: To force IntelliJ to include each and every impor...
Getting the count of unique values in a column in bash
... until further notice.Paused until further notice.
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a...
How do I set a column value to NULL in SQL Server Management Studio?
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edited Dec 31 '13 at 21:18
brutzen
1777 bronze badges
answered Jan 14 '09 at 21:02
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How can I define a composite primary key in SQL?
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edited Jul 12 '09 at 15:48
answered Jul 10 '09 at 15:46
cl...
how do you filter pandas dataframes by multiple columns
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edited Feb 28 '14 at 5:37
answered Feb 28 '14 at 4:40
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