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How to map and remove nil values in Ruby
...nchmarks against some of the earlier approaches to this problem:
N = 1_00_000
enum = 1.upto(1_000)
Benchmark.bmbm do |x|
x.report("select + map") { N.times { enum.select { |i| i.even? }.map{|i| i + 1} } }
x.report("map + compact") { N.times { enum.map { |i| i + 1 if i.even? }.compact } }
x.r...
What's the difference between `on` and `live` or `bind`?
...s attach directly to the event target. If you have a table of, let's say, 1000 lines and 100 columns, and each of the 100'000 cells includes a checkbox which click you want to handle. Attaching 100'000 event handlers will take a lot of time on page load. Creating a single event at the table level, a...
python pandas remove duplicate columns
... number of columns you can have. For me it failed for a dataframe with 100,000 rows for instance, as this yields 100,000 columns after transposing, which is not possible
– Eelco van Vliet
Mar 3 at 10:08
...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...rse & 0xFF00) >> 8;
unsigned char inByte2 = (toReverse & 0xFF0000) >> 16;
unsigned char inByte3 = (toReverse & 0xFF000000) >> 24;
reversed = (reverseBits(inByte0) << 24) | (reverseBits(inByte1) << 16) | (reverseBits(inByte2) << 8) | (reverseBits(inByte...
Python and pip, list all versions of a package that's available?
... answered Mar 24 '11 at 16:11
m000m000
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...
Elasticsearch query to return all records
...
http://127.0.0.1:9200/foo/_search/?size=1000&pretty=1
^
Note the size param, which increases the hits displayed from the default (10) to 1000 per shard.
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/s...
If using maven, usually you put log4j.properties under java or resources?
...
Google results for "Jump off a bridge": 18.200.000. Google results for "Do not jump off a bridge": 137.000
– djjeck
Jan 11 '13 at 0:35
...
LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
...ut 10 times faster than SingleOrDefault , using a List<MyClass> of 9,000,000 elements, class contains 2 integers and the Func contains a search of these two integers. Searching 200 times in a loop took 22 seconds on var v = list.SingleOrDefault(x => x.Id1 == i && x.Id2 == i); and va...
Safest way to convert float to integer in python?
...e stored accurately.
Adding one to 111(omitted)111 (53 ones) yields 100...000, (53 zeroes). As we know, we can store 53 digits, that makes the rightmost zero padding.
This is where 253 comes from.
More detail: We need to consider how IEEE-754 floating point works.
1 bit 11 / 8 52 / 23...
What can you do in MSIL that you cannot do in C# or VB.NET? [closed]
...Attribute::.ctor(int32) = ( 01 00 08 00 00 00 00 00 )
.hash algorithm 0x00008004
.ver 0:0:0:0
}
.module sample.exe
// MVID: {A224F460-A049-4A03-9E71-80A36DBBBCD3}
.imagebase 0x00400000
.file alignment 0x00000200
.stackreserve 0x00100000
.subsystem 0x0003 // WINDOWS_CUI
.corflags 0x0000000...