Christopher Sahnwaldt jcsahnwaldt

jcsahnwaldt / ToMap.java

Last active August 29, 2015 14:16

Microbenchmark: Convert list to map with or without streams / lambdas. Result: Performance is the same. See https://stackoverflow.com/questions/674639/scala-best-way-of-turning-a-collection-into-a-map-by-key/3249462#comment46124673_3249462

	import java.util.*;
	import java.util.stream.*;
	import static java.util.stream.Collectors.*;
	import java.util.function.*;

	class Value {

	private final String key;

	public Value(String key) {

jcsahnwaldt / ProcFunc.java

Created March 10, 2015 04:38

Microbenchmark: procedural vs functional extraction of error lines. See https://twitter.com/jcsahnwaldt/status/574705132555923456

	import java.util.*;
	import java.util.stream.*;
	import static java.util.stream.Collectors.*;
	import java.io.*;
	import java.nio.file.*;

	public class ProcFunc {

	public static <T> Iterator<T> limit(Iterator<? extends T> it, int max) {
	return new Iterator<T>() {

jcsahnwaldt / triangle.c

Last active April 4, 2023 05:27

	// https://stackoverflow.com/questions/53585022/three-colors-triangles/53588144#53588144
	// https://www.codewars.com/kata/insane-coloured-triangles/train/c

	#define _GNU_SOURCE
	#include <stdlib.h>
	#include <string.h>

	char triangle(const char *s)
	{
	char* row = strdup(s);

jcsahnwaldt / test_libxml_warnings.rb

Last active May 30, 2023 13:01

See https://github.com/xml4r/libxml-ruby/issues/198

	# Results in comments are from Ruby 3.2.2, libxml-ruby 4.1.1 on macOS

	require 'libxml-ruby'

	# new() is undefined for Writer
	# https://github.com/xml4r/libxml-ruby/blob/master/ext/libxml/ruby_xml_writer.c#L1134
	# LibXML::XML::Writer.new() # crash: undefined method `new' for LibXML::XML::Writer:Class (NoMethodError)
	LibXML::XML::Writer.io(nil) # warning: undefining the allocator of T_DATA class LibXML::XML::Writer

	# new() is neither undefined nor redefined for Reader

jcsahnwaldt / partition.c

Last active September 6, 2023 12:19