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While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it much simpler to think about both the old list and the new one, what they contain, and

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This guide will get you started using Spark on Heroku/Cedar. Spark is basically a clone of Sinatra for Java. 'Nuff said.

Create your app

Create a single Java main class in src/main/java/HelloWorld.java:

:::java
import static spark.Spark.*;
import spark.*;

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/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home/bin/java -Djava.library.path=/Users/Washington/projects/tcc/libs-vp/jlfgr-1_0.jar "-Djava.library.path=/Users/Washington/projects/tcc/libs\ VCS" -Didea.launcher.port=7533 "-Didea.launcher.bin.path=/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath "/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home/jr

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git config --global alias.checkoutr checkout
nano /usr/local/share/zsh/site-functions/git-completion.bash

...and then modify the file as follows...

-__gitcomp_nl "$(__git_refs '' $track)"
+if [ "$command" = "checkoutr" ]; then
+    __gitcomp_nl "$(__git_refs '' $track)"
+else

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package javaapplication1;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

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Collections.sort(savedClientSectors, new Comparator<ClientSector>() {
  @Override
  public int compare(ClientSector o1, ClientSector o2) {
    return o1.getName().compareTo(o2.getName());
  }
});

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'use strict';

angular.module('multiVideo',[])
  .directive('multiVideo', function ($compile,$sce,$rootScope,$interval,$window) {

    var templateWrapperProgressBar = '<div class="progress-wrapper">'+
                                          '<div class="progress-overlay"></div>'+
                                      '</div>';

    var templateProgressBar       =   '<div class="progress-play" ></div>'+

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window.addEventListener('online', networkStatus);
window.addEventListener('offline', networkStatus);

function networkStatus(e){
  console.log(e.type);
}

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package p_1161;


import java.io.IOException;
import java.util.Scanner;

public class Main {
    public static void main(String args[]) throws IOException {
        Scanner sc = new Scanner(System.in);

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import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String args[]){

        Scanner sc = new Scanner(System.in);
        ArrayList<String> palavras = new ArrayList<>();
        int qtd = sc.nextInt();