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SparseArray vs HashMap
...ere is an example of SparseIntArray vs HashMap<Integer, Integer> for 1000 elements:
SparseIntArray:
class SparseIntArray {
int[] keys;
int[] values;
int size;
}
Class = 12 + 3 * 4 = 24 bytes
Array = 20 + 1000 * 4 = 4024 bytes
Total = 8,072 bytes
HashMap:
class HashMap<K, V...
Expansion of variables inside single quotes in a command in Bash
...mple, the following is very unsafe. DON'T DO THIS
script="echo \"Argument 1 is: $myvar\""
/bin/sh -c "$script"
If the contents of $myvar is untrusted, here is an exploit:
myvar='foo"; echo "you were hacked'
Instead of the above invocation, use positional arguments. The following invocation is ...
Java compile speed vs Scala compile speed
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edited May 23 '17 at 12:02
Community♦
111 silver badge
answered Aug 16 '10 at 4:07
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Comma in C/C++ macro
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112
Because angle brackets can also represent (or occur in) the comparison operators <, >, &...
How to merge remote changes at GitHub?
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106
See the 'non-fast forward' section of 'git push --help' for details.
You can perform "git ...
What is the purpose of a question mark after a type (for example: int? myVariable)?
...32>, pronounced "Nullable of Int32," can be assigned any
value from -2147483648 to 2147483647, or it can be assigned the null
value. A Nullable<bool> can be assigned the values true, false, or
null. The ability to assign null to numeric and Boolean types is
especially useful when yo...
How to scroll to the bottom of a UITableView on the iPhone before the view appears
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JavaScript naming conventions [closed]
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edited Dec 25 '17 at 11:44
Benjamin R
56466 silver badges2222 bronze badges
answered May 28 '...