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Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
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499
NOTE: All algorithms below are in C, but should be portable to your language of choice (just d...
python max function using 'key' and lambda expression
... Applying max to a list of tuples.
>>> lis = [(1,'a'), (3,'c'), (4,'e'), (-1,'z')]
By default max will compare the items by the first index. If the first index is the same then it'll compare the second index. As in my example, all items have a unique first index, so you'd get this as the...
How to return an empty ActiveRecord relation?
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489
There is a now a "correct" mechanism in Rails 4:
>> Model.none
=> #<ActiveRecord...
Integer division: How do you produce a double?
...will be a
correctly rounded version of the
integer value, using IEEE 754
round-to-nearest mode (§4.2.4).
5 can be expressed exactly as a double.
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Android RatingBar change star colors [closed]
... CommonsWareCommonsWare
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Find MongoDB records where array field is not empty
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answered Aug 5 '14 at 15:24
Chris'Chris'
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How do you use bcrypt for hashing passwords in PHP?
...rasmuslerdorf', PASSWORD_BCRYPT, $options)."\n";
// $2y$11$6DP.V0nO7YI3iSki4qog6OQI5eiO6Jnjsqg7vdnb.JgGIsxniOn4C
To verify a user provided password against an existing hash, you may use the password_verify() as such:
<?php
// See the password_hash() example to see where this came from.
$hash =...
How to find out which version of the .NET Framework an executable needs to run?
...2.0.50727
.assembly extern mscorlib
{
.publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
.ver 2:0:0:0
}
.assembly extern System
{
.publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
.ver 2:0:0:0
}
Reflector:
.module WindowsFormsAp...