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removeAllImgsFilter = function(node){
  if (node.tagName=="IMG") //filter out all IMG elements
    return NodeFilter.FILTER_ACCEPT;
  else
    return NodeFilter.FILTER_SKIP;
}
 
var walker = document.createTreeWalker(document.body, NodeFilter.SHOW_ELEMENT, removeAllImgsFilter, false);
 
while (walker.nextNode())

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Javascript Scratchboard

Array

Concatenate array

[1,4,67,34,677].reduce((accumulator, current) => accumulator + current, []);

"146734677"

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How to delete many Twitter Likes at a time

Simply go in your (Chrome) browser to the Likes-page, e.g. https://twitter.com/{your user handle}/likesand open the DevTools console (CMD OPT i on a Mac). Paste the following code into the console:

document.querySelectorAll("[data-testid='unlike']").forEach( el => el.click() );

This will click all heart icons on that page, in effect unliking all visible Likes. Scroll down and repeat as many times as needed.

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GCP Qwiklabs – Setting Up an (outdated) Java Development Environment on GCP

Problem: The course instructions use an outdated Java 8 version. The simple server for the quiz would not compile in Java 11.

It was tricky to set up an outdated Java version. So here are updated instructions to pass the checkpoints (this is well within the Coursera student honor code as it is just an update of the official instructions).

Part of a Coursera MOOC on Google Cloud Platform

Qwiklabs – Setting Up a Development Environment: Java

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Introduction

• C-a == Ctrl-a
• M-a == Alt-a

General

:q        close
:w        write/saves
:wa[!]    write/save all windows [force]
:wq       write/save and close

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<h1>Week of the year: <span id="weekNumber"> <button onClick="setNum()">click to show</button> </span></h1>

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<div class="container">
<div id="logo">
  <svg id="Ebene_1" data-name="Ebene 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 294.78 105.6" copyright="Oliver Schafeld, info@schafeld.com">
  <defs>
    <style>
      .cls-12{letter-spacing:0}
    </style>
    <linearGradient id="Unbenannter_Verlauf_8" data-name="Unbenannter Verlauf 8" x1="-1.63" y1="83.58" x2="35.13" y2="70.2" gradientUnits="userSpaceOnUse">
      <stop offset=".16" stop-color="#b4e1fa"/>
      <stop offset=".59" stop-color="#4ac0e5"/>

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<div class="demo">

<p>
    <label for="amount">Volume:</label>
    <input type="text" id="amount" style="border:0; color:#f6931f; font-weight:bold;" />
</p>

<div id="slider-horizontal"></div>

</div>

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<svg xmlns="http://www.w3.org/2000/svg" 
     width="236" 
     height="244" 
     viewBox="0 0 236 244"
     class="gauge first rotate-five-percent">
  <g fill="none" fill-rule="evenodd">
    <g fill-rule="nonzero">
      <path fill="#FFF" d="M183.7 98.67c-.02-.11-.055-.217-.1-.32-.024-.048-.05-.095-.08-.14-3.18-7.603-7.767-14.538-13.52-20.44-.05-.13-.15-.235-.28-.29-12.24-12.43-28.956-19.427-46.4-19.42h-.64c-8.573.073-17.046 1.844-24.93 5.21l-.2.06c-.088.04-.17.085-.25.14-7.613 3.333-14.523 8.084-20.36 14-.134.056-.238.165-.29.3-5.66 5.782-10.2 12.563-13.39 20l-.05.09c-.05.102-.086.21-.11.32-3.322 7.968-5.022 16.518-5 25.15-.078 17.31 6.766 33.933 19.01 46.17.29.273.672.43 1.07.44.4-.003.78-.165 1.06-.45l9-9.15c.397-.378.556-.942.415-1.472-.14-.53-.56-.94-1.09-1.07-.533-.132-1.095.038-1.465.442l-7.88 8c-4.874-5.102-8.844-10.996-11.74-17.43l10.1-4.81c.748-.356 1.066-1.252.71-2-.356-.748-1.252-1.066-2-.71l-10 4.8c-2.668-6.787-4.12-13.99-4.29-21.28l11.31-.25c.828 0 1.5-.672 1.5-1.5s-.672-1.5-1.5-1.5l-11.31.25c