Aaron Decker a-r-d

## memory.md

      
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                a-r-d
                / memory.md
            
            
              Created
              January 30, 2018 16:15
            
              
                A million ways to change HEAP memory in Java
              
          
    Xmx vs Xms

Remember, Xmx corresponds to max heap and Xms corresponds to starting heap. It can be an optimization to set these equal.
In Spring Boot build.gradle

bootRun {
      jvmArgs = ['-Xmx1g']
}


## traverse.js

function traverse(obj) {
    var stack = [];
	  var i = 0;
    stack.push(obj);

    while (stack.length) {
        for (var j in stack[0]) {
            i++;
            if (typeof stack[0][j] === 'object') {

## async-await.js
// function that returns a promise
function getAMessage() {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve("passing this value back...");
    }, 2000);
  });
}

// function is marked async

## gist:f68a6999565f9426a89397a68c5f81ba
0x683A802cB2346CB769dd0E3D7FaCcf08d1073fBE

## ExampleMultipleStringsToList.java
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class ExampleMultipleStringsToList {

	public static void main(String[] args) {
		  // read in a line
        Scanner scanner = new Scanner(System.in);

## IteratorExample.java
// assume some stuff like this exists
ArrayList<String> lines = ...
BufferedWriter writer = ...

// get your iterator instance.
Iterator<String> iterator = lines.iterator();
String write = null;

// iterate + check inside of the while loop condition test.
while (iterator.hasNext() && (write = iterator.next()) != null) {

## index.html
<html>
  <head>
    <title>Canvas Boilerplate</title>

    <style type="text/css">
      *,html{
        margin: 0;padding: 0;
      }
      canvas {
        width: 100%;

## index.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/core-min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/hmac-sha1.js"></script>

</head>

## ssh-tunnel.sh
# cassandra runs on 9042 for devCenter management
# expose it (9999 locally) running on a remote server locally:

ssh -L 9999:localhost:9042 -f -N remoteuser@remotehost

## draw.io.diagram.xml
<mxfile userAgent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.84 Safari/537.36" version="5.5.2.3" editor="www.draw.io" type="device"><diagram>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

	function traverse(obj) {
	var stack = [];
	var i = 0;
	stack.push(obj);

	while (stack.length) {
	for (var j in stack[0]) {
	i++;
	if (typeof stack[0][j] === 'object') {
	// function that returns a promise
	function getAMessage() {
	return new Promise(resolve => {
	setTimeout(() => {
	resolve("passing this value back...");
	}, 2000);
	});
	}

	// function is marked async
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.List;
	import java.util.Scanner;

	public class ExampleMultipleStringsToList {

	public static void main(String[] args) {
	// read in a line
	Scanner scanner = new Scanner(System.in);
	// assume some stuff like this exists
	ArrayList<String> lines = ...
	BufferedWriter writer = ...

	// get your iterator instance.
	Iterator<String> iterator = lines.iterator();
	String write = null;

	// iterate + check inside of the while loop condition test.
	while (iterator.hasNext() && (write = iterator.next()) != null) {
	<html>
	<head>
	<title>Canvas Boilerplate</title>

	<style type="text/css">
	*,html{
	margin: 0;padding: 0;
	}
	canvas {
	width: 100%;
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>JS Bin</title>

	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/core-min.js"></script>
	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/hmac-sha1.js"></script>

	</head>
	# cassandra runs on 9042 for devCenter management
	# expose it (9999 locally) running on a remote server locally:

	ssh -L 9999:localhost:9042 -f -N remoteuser@remotehost