apatrida’s gists

apatrida / lazy-breadth-first-trversal.kt

Last active December 30, 2024 23:57

Kotlin binary tree breadth first - fully lazy traversal

	/* related to: https://x.com/vikhyatk/status/1873033432705712304 */

	import java.util.LinkedList

	data class BinaryTreeNode(val label: String, val left: BinaryTreeNode? = null, val right: BinaryTreeNode? = null)

	data class NodeAtLevel(val level: Int, val node: BinaryTreeNode)

	/**
	* Lazy Breadth First Traversal of the binary tree by node, left to right by level

apatrida / binary-tree-breadth-first.sql

Created December 30, 2024 20:17

Binary Tree Breadth First Traversal in SQL (SQLite version)

	/* related to: https://x.com/vikhyatk/status/1873033432705712304 */

	-- Setup
	DROP TABLE IF EXISTS binary_tree;
	CREATE TABLE binary_tree (
	id INTEGER NOT NULL PRIMARY KEY,
	label TEXT NOT NULL,
	left_child INTEGER INTEGER REFERENCES binary_tree(id),
	right_child INTEGER REFERENCES binary_tree(id)
	);

apatrida / jlistSelection.java

Last active December 8, 2024 16:24

Setting a JList items to match a source list

	// myJList => JList component holding type MyObject
	// sourceList => List<MyObject> (or other colleciton type) to match selection

	// note MyObject will be checked for referential == if you do not implement equals and hashCode

	var model = (DefaultListModel<MyObject>) myJList.getModel();
	myJList.clearSelection();
	int[] indexes = sourceList.stream()
	.mapToInt(obj -> model.indexOf(obj))
	.filter(idx -> idx >= 0).toArray();

apatrida / Guard-Example.swift

Last active May 25, 2018 15:06

	func submit() {
	guard let name = nameField.text else {
	show("No name to submit")
	return
	}

	guard let address = addressField.text else {
	show("No address to submit")
	return
	}

apatrida / SkiInSingapore.kt

Last active July 30, 2019 16:55

Ski in Singapore problem from: http://geeks.redmart.com/2015/01/07/skiing-in-singapore-a-coding-diversion/

	@file:Suppress("NOTHING_TO_INLINE")

	import java.io.BufferedReader
	import java.io.File
	import java.io.InputStream
	import java.io.InputStreamReader
	import kotlin.system.measureTimeMillis

	// Kotlin 1.2.0 (probably 1.6.0 will work as well)
	//

apatrida / DexlibAdapter.kt

Last active February 11, 2016 18:25

borisf/dex-method-dumper more idiomatic

	package com.google.classyshark.silverghost.translator.dex

	object DexlibAdapter {
	val primitiveTypes = mapOf(
	"I" to "int",
	"V" to "void",
	"C" to "char",
	"D" to "double",
	"F" to "float",
	"J" to "long",

apatrida / java-code-involved-in-int-summarization.java

Last active January 7, 2016 23:09

Kotlin brevity as seen when comparing the implementation internally of JDK 8 Stream.collect summarizingInt and a custom Kotiln version. See many examples comparing Java 8 Stream.collect vs. Kotlin stdlib (http://stackoverflow.com/questions/34642254)

	// Shown from the Java 8 JDK source code, only comments removed.
	public static <T>
	Collector<T, ?, IntSummaryStatistics> summarizingInt(ToIntFunction<? super T> mapper) {
	return new CollectorImpl<T, IntSummaryStatistics, IntSummaryStatistics>(
	IntSummaryStatistics::new,
	(r, t) -> r.accept(mapper.applyAsInt(t)),
	(l, r) -> { l.combine(r); return l; }, CH_ID);

	public class IntSummaryStatistics implements IntConsumer {
	private long count;

apatrida / AutoclosingKotlin.kt

Last active October 1, 2015 18:46

How to make your own support for AutoCloseable


	class Fred : AutoCloseable {
	override fun close() {

	}
	}

	public fun foo() {
	Fred().use {
	// do something then autoclose

apatrida / VertxHttpServletRequest.java

Last active November 25, 2022 18:45

Vert-x3 wrappers for HttpServletRequest and HttpServletResponse

	package com.collokia.webapp.routes;


	import io.netty.handler.codec.http.HttpHeaders;
	import io.vertx.core.net.SocketAddress;
	import io.vertx.ext.web.RoutingContext;
	import io.vertx.ext.web.Session;
	import sun.reflect.generics.reflectiveObjects.NotImplementedException;

	import javax.servlet.*;

apatrida / TimeStuff.kt

Created September 20, 2014 17:04

More with expressive Time things and Kotlin

	enum class TimeUnit(val name: String, val divisorFromNanos: Long, val precision: Int) {
	Seconds : TimeUnit("seconds", 1000000000, 2)
	Millis : TimeUnit("millis", 1000000, 0)
	Micros : TimeUnit("micros", 1000, 0)
	Nanos : TimeUnit("nanos", 1, 0)

	fun toHumanReadable(nanoTime: Long): String = "%.${precision}f ${name}".format(nanoTime.toFloat() / divisorFromNanos.toFloat())
	}

	class Duration(val duration: Long, val units: TimeUnit, private val durationInNanos: Long = duration * units.divisorFromNanos) : Comparable<Duration> {

Jayson Minard apatrida