oliverjumpertz

package de.oliver;

import javaslang.collection.List;

public class SquareOfNumberCalculator {
  public static void main(String[] args) {
    final List<Integer> myList = List.range(1, 6);
    final List<Integer> squaredNumbers = myList.map(i -> i * i);
    System.out.println("Printing original numbers");
    myList.forEach(i -> System.out.println(" i --> " + i));

oliverjumpertz

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>aGroupId</groupId>
  <artifactId>test-jar-resources</artifactId>
  <version>1.0-SNAPSHOT</version>

oliverjumpertz

type AnyFunc = (...args: any) => any;

export function once(func: AnyFunc): AnyFunc {
  let alreadyCalled = false;
  return (...args: any[]): any => {
    if (alreadyCalled) {
      return undefined;
    }

    alreadyCalled = true;

oliverjumpertz

import readline from 'readline';

async function readStdIn() {
  return new Promise((resolve, reject) => {
    const rl = readline.createInterface({ input: process.stdin, output: process.stdout });

    let input = '';

    rl.on('line', (line) => {
      input += line;

oliverjumpertz

node_modules/
README.md

oliverjumpertz

FROM public.ecr.aws/lambda/nodejs:12

COPY package*.json ./
RUN npm install
COPY index.js ./

CMD [ "index.handler" ]

oliverjumpertz

const dict = {};
dict.__proto__; // => {}
console.log(dict.hasOwnProperty); // => f hasOwnProperty() {}

const emptyDict = Object.create(null);
emptyDict.__proto__; // => undefined
emptyDict.hasOwnProperty; // => undefined


// ❗️ Anyone can modify the object prototype from the outside

oliverjumpertz

// Iterating over the array with each individual element at hand while separately
// keeping track of the index.
let i = 0;
for (const element of array) {
  console.log(i++, element);
}

oliverjumpertz

function getCheering(followers) {
  // If you were to switch over followers, you'd be surprised,
  // because you'd always hit the default case.
  // By switching over true, all cases get evaluated properly, although they
  // contain numeric ranges!
  switch (true) {
    case followers >= 2000:
      return "Wow, I'm speechless. I'm so happy, thank you!!!";
    case followers >= 1000:
      return "Wow, this is so great!";

oliverjumpertz

function simpleMovingAverage(prices, window = 5, n = Infinity) {
  if (!prices || prices.length < window) {
    return [];
  }

  let index = window - 1;
  const length = prices.length + 1;

  const simpleMovingAverages = [];