diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..916cbbd9e6 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -59,6 +59,30 @@
 
 <script>
 
+  //HJW
+  function playSound(e){
+  console.log(e.keyCode);
+  const audio = document.querySelector(`audio[data-key="${e.keyCode}"`);
+  const key = document.querySelector(`.key[data-key="${e.keyCode}"`);
+  console.log(audio);
+  if (!audio) return;
+  console.log(key);
+  audio.currentTime = 0;
+  audio.play();
+  key.classList.add('playing');
+  }
+
+  function removeTransition(e){
+    if (e.propertyName !== 'transform') return;
+    console.log(e.propertyName);
+    console.log(this);
+    this.classList.remove('playing');
+  }
+
+  const keys = document.querySelectorAll('.key')
+  keys.forEach(key => key.addEventListener('transitionend', removeTransition));
+  window.addEventListener('keydown', playSound);
+
 </script>
 
 
diff --git a/02 - JS + CSS Clock/index-START.html b/02 - JS + CSS Clock/index-START.html
index 2712384201..828dca02fa 100644
--- a/02 - JS + CSS Clock/index-START.html	
+++ b/02 - JS + CSS Clock/index-START.html	
@@ -61,12 +61,40 @@
       background:black;
       position: absolute;
       top:50%;
+      transform-origin: 100%;
+      transform: rotate(90deg);
+      transition: all 0.05s;
+      /* transition-timing-function: cubic-bezier: adjusts appearance of motion*/
+      transition-timing-function: cubic-bezier(.1, 2.7, .58, 1);
     }
 
   </style>
 
   <script>
 
+  const secondHand = document.querySelector('.second-hand');
+  const minuteHand = document.querySelector('.min-hand');
+  const hourHand = document.querySelector('.hour-hand');
+
+    function setDate() {
+      console.log('Hi');
+      const now = new Date();
+      const seconds = now.getSeconds();
+      const minutes = now.getMinutes();
+      const hours = now.getHours();
+
+      console.log(seconds);
+      const secondsDegs = ((seconds / 60) * 360) + 90;
+      secondHand.style.transform = `rotate(${secondsDegs}deg`;
+
+      const minsDegs = ((minutes / 60) *360) + 90;
+      minuteHand.style.transform = `rotate(${minsDegs}deg`;
+
+      const hoursDegs = ((hours / 12) *360) + 90;
+      hourHand.style.transform = `rotate(${hoursDegs}deg`;
+    }
+
+    setInterval(setDate,1000);
 
   </script>
 </body>
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
index 7171607a8b..dae79e9bb6 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -21,6 +21,21 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   <img src="https://source.unsplash.com/7bwQXzbF6KE/800x500">
 
   <style>
+    :root {
+      --base: #373737;
+      --spacing: 10px;
+      --blur: 10px;
+    }
+
+    img{
+      padding: var(--spacing);
+      background: var(--base);
+      filter: blur(var(--blur));
+    }
+
+    .hl{
+      color: var(--base);
+    }
 
     /*
       misc styles, nothing to do with CSS variables
@@ -48,6 +63,20 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+    const inputs = document.querySelectorAll('.controls input');
+
+    function handleUpdate(){
+      // console.log(this.value);
+      console.log(this.dataset);
+      const suffix = this.dataset.sizing || '';
+      /*so you can take the px to the end of the new value below or else it won't read*/
+      document.documentElement.style.setProperty(`--${this.name}`, this.value + suffix)
+    }
+
+    inputs.forEach(input => input.addEventListener('change', handleUpdate));
+      /*does not change for when you drag back and forth, so add mousemove below*/
+    inputs.forEach(input => input.addEventListener('mousemove', handleUpdate));
+
   </script>
 
 </body>
diff --git a/04 - Array Cardio Day 1/index-START.html b/04 - Array Cardio Day 1/index-START.html
index 4162bce339..247958ff63 100644
--- a/04 - Array Cardio Day 1/index-START.html	
+++ b/04 - Array Cardio Day 1/index-START.html	
@@ -33,29 +33,106 @@
 
     // Array.prototype.filter()
     // 1. Filter the list of inventors for those who were born in the 1500's
+    const fifteen = inventors.filter(inventor =>
+      inventor.year >= 1500 && inventor.year < 1600)
+      console.table(fifteen);
 
     // Array.prototype.map()
     // 2. Give us an array of the inventors' first and last names
+    //will always return the same number of items as you give it
+    // const fullNames = inventors.map(inventor =>
+    //   inventor.first + ' ' + inventor.last);
+    // console.log(fullNames);
+    // //or
+    const fullNames = inventors.map(inventor =>
+      `${inventor.first} ${inventor.last}`);
+    console.log(fullNames);
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
+    //you get two items and you have to sort those two
+
+    // const ordered = inventors.sort(function(a, b){
+    //   if (a.year > b.year){
+    //     return 1;
+    //   } else {
+    //     return -1;
+    //   }
+    // })
+
+    // console.table(ordered)
+    //or
+
+    const ordered = inventors.sort((a, b) =>
+      a.year > b.year ? 1 : -1);
+
+    console.table(ordered);
 
     // Array.prototype.reduce()
     // 4. How many years did all the inventors live?
+    const totalYears = inventors.reduce((total, inventor) => {
+      return total + (inventor.passed - inventor.year);
+      //to get the number of years they lived
+    }, 0)
+    console.log(totalYears);
 
     // 5. Sort the inventors by years lived
+    const oldest = inventors.sort(function(a, b){
+      const lastGuy = a.passed - a.year;
+      const nextGuy = b.passed - b.year;
+      return lastGuy > nextGuy ? -1 : 1;
+      // if(lastGuy > nextGuy){
+      //   return -1;
+      // } else {
+      //   return 1;
+      // }
+    })
+    console.table(oldest);
 
     // 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name
     // https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris
 
+    //IN CONSOLE OF WIKI PAGE^
+    //dev tools
+    //
+// const category = document.querySelector('.mw-category');
+// const links = Array.from(category.querySelectorAll('a'));
+// //convert list of links to list of names
+// //array.from will make it into an array from the nodelist
+
+// const de = links
+//   .map(link => link.textContent)
+// //will give the text inside of each link
+//   .filter(streetName => streetName.includes('de'));
+// //will filter them out
 
     // 7. sort Exercise
     // Sort the people alphabetically by last name
+    const alpha = people.sort((lastOne, nextOne) => {
+      // console.log(lastOne);
+      const [last, first] = lastOne.split(', ');
+      const [lastN, firstN] = nextOne.split(', ');
+      // console.log(last, first);
+      // console.log(lastN, firstN);
+      return last > lastN ? 1 : -1;
+    })
+      console.log(alpha);
 
     // 8. Reduce Exercise
     // Sum up the instances of each of these
     const data = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck' ];
 
+    const transportation = data.reduce(function(obj, item) {
+      if (!obj[item]){
+        obj[item] = 0;
+      }
+
+      // console.log(item);
+      obj[item] ++;
+      return obj;
+    }, {})
+      console.log(transportation);
+
   </script>
 </body>
 </html>
diff --git a/05 - Flex Panel Gallery/index-START.html b/05 - Flex Panel Gallery/index-START.html
index e1d643ad5c..70b00a94db 100644
--- a/05 - Flex Panel Gallery/index-START.html	
+++ b/05 - Flex Panel Gallery/index-START.html	
@@ -24,6 +24,7 @@
     .panels {
       min-height:100vh;
       overflow: hidden;
+      display: flex;
     }
 
     .panel {
@@ -41,6 +42,13 @@
       font-size: 20px;
       background-size:cover;
       background-position:center;
+      flex: 1;
+      /*which means that they'll evenly distribute*/
+      justify-content: center;
+      align-items: center;
+      display: flex;
+      flex-direction: column;
+      /* nest the flex box*/
     }
 
 
@@ -54,8 +62,17 @@
       margin:0;
       width: 100%;
       transition:transform 0.5s;
+      flex: 1 0 auto;
+      display: flex;
+      justify-content: center;
+      align-items: center;
     }
 
+    .panel > *:first-child { transform: translateY(-100%); }
+    .panel.open-active > *:first-child { transform: translateY(0); }
+    .panel > *:last-child { transform: translateY(100%); }
+    .panel.open-active > *:last-child { transform: translateY(0); }
+
     .panel p {
       text-transform: uppercase;
       font-family: 'Amatic SC', cursive;
@@ -67,6 +84,8 @@
     }
 
     .panel.open {
+      flex: 5;
+      /*flex of 5 means that when it has the class of open, it's going to be 5x the size of the rest of them*/
       font-size:40px;
     }
 
@@ -107,6 +126,21 @@
   </div>
 
   <script>
+  const panels = document.querySelectorAll('.panel');
+  function toggleOpen(){
+    this.classList.toggle('open');
+  }
+
+  function toggleActive(e){
+    // console.log(e.propertyName);
+    if (e.propertyName.includes('flex')){
+      this.classList.toggle('open-active');
+    // this.classList.toggle('open-active');
+  }
+}
+
+  panels.forEach(panel => panel.addEventListener('click', toggleOpen));
+  panels.forEach(panel => panel.addEventListener('transitionend', toggleActive));
 
   </script>
 
diff --git a/06 - Type Ahead/index-START.html b/06 - Type Ahead/index-START.html
index 1436886918..a79d8e7fa2 100644
--- a/06 - Type Ahead/index-START.html	
+++ b/06 - Type Ahead/index-START.html	
@@ -17,6 +17,62 @@
 <script>
 const endpoint = 'https://gist.githubusercontent.com/Miserlou/c5cd8364bf9b2420bb29/raw/2bf258763cdddd704f8ffd3ea9a3e81d25e2c6f6/cities.json';
 
+const cities = [];
+
+fetch(endpoint)
+  // .then(blob => console.log(blob))
+  .then(blob => blob.json())
+  // .then(data => console.log(data))
+  .then(data => cities.push(...data))
+//fetch itself will return a promise
+
+
+//matching function
+function findMatches(wordToMatch, cities){
+  return cities.filter(place => {
+    //if city matches search
+    const regex = new RegExp(wordToMatch, 'gi');
+    //global and insensitive so disregards case
+    return place.city.match(regex) || place.state.match(regex);
+    //will check if city or state has either one
+    //filter will be run
+  })
+}
+
+function numbWithCommas(x){
+  return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
+}
+
+
+//display function
+function displayMatches() {
+  console.log(this.value);
+  const matchArray = findMatches(this.value, cities)
+  console.log(matchArray);
+  const html = matchArray.map(place => {
+    //.replace lines to highlight the matched input
+    const regex = new RegExp(this.value, 'gi');
+    const cityName = place.city.replace(regex, `<span class="hl">${this.value}</span>`);
+    const stateName = place.state.replace(regex, `<span class="hl">${this.value}</span>`);
+    return `
+    <li>
+      <span class="name">${cityName}, ${stateName}</span>
+      <span class="population">${numbWithCommas(place.population)}</span>
+    </li>
+    `;
+  }).join(''); // .map returns an array so this will make it a string
+  suggestions.innerHTML = html;
+}
+
+//what is being searched
+const searchInput = document.querySelector('.search');
+const suggestions = document.querySelector('.suggestions');
+
+searchInput.addEventListener('change', displayMatches);
+//change event only fires when you go off that input
+searchInput.addEventListener('keyup', displayMatches);
+
+
 </script>
   </body>
 </html>
diff --git a/07 - Array Cardio Day 2/index-START.html b/07 - Array Cardio Day 2/index-START.html
index 206ec31aa0..919b4af4d6 100644
--- a/07 - Array Cardio Day 2/index-START.html	
+++ b/07 - Array Cardio Day 2/index-START.html	
@@ -26,9 +26,45 @@
 
     // Some and Every Checks
     // Array.prototype.some() // is at least one person 19?
-    // Array.prototype.every() // is everyone 19?
+    //will return true if there is at least one adult in people array who is over 19
+
+    // const isAdult = people.some(function(person){
+    //   const currentYear = (new Date()).getFullYear();
+    //   if(currentYear - person.year >= 19){
+    //     return true;
+    //   }
+    // });
+    // console.log(isAdult);
+    //or
+
+    const isAdult = people.some(person => {
+      const currentYear = (new Date()).getFullYear();
+      return currentYear - person.year >= 19;
+    });
+    console.log(isAdult);
+
+   // Array.prototype.every() // is everyone 19?
+    const allAdult = people.every(person => {
+      const currentYear = (new Date()).getFullYear();
+      return currentYear - person.year >= 19;
+    });
+    console.log(allAdult);
+
+
+    // // Array.prototype.find()
+    // const theComment = comments.find(function(comment) {
+    //   if(comment.id === 823423){
+    //     return true;
+    //   }
+    // });
+    // console.log(theComment);
+    //or
+
+    const theComment = comments.find(comment =>
+      comment.id === 823423);
+    console.log(theComment);
+
 
-    // Array.prototype.find()
     // Find is like filter, but instead returns just the one you are looking for
     // find the comment with the ID of 823423
 
@@ -36,6 +72,21 @@
     // Find the comment with this ID
     // delete the comment with the ID of 823423
 
+    const index = comments.findIndex(comment =>
+      comment.id === 823423);
+    console.log('index', index);
+
+    // comments.splice(index, 1);
+
+    //popular in redux world:
+    const newComments = [
+      ...comments.slice(0, index),
+      ...comments.slice(index + 1)
+      ];
+
+      //will build new array of comments
+      //... will spread items into new array
+
   </script>
 </body>
 </html>
diff --git a/08 - Fun with HTML5 Canvas/index-START.html b/08 - Fun with HTML5 Canvas/index-START.html
index 37c148df07..a202e24901 100644
--- a/08 - Fun with HTML5 Canvas/index-START.html	
+++ b/08 - Fun with HTML5 Canvas/index-START.html	
@@ -7,6 +7,71 @@
 <body>
 <canvas id="draw" width="800" height="800"></canvas>
 <script>
+  const canvas = document.querySelector('#draw');
+  const ctx = canvas.getContext('2d');
+  //resize canvas
+  canvas.width = window.innerWidth;
+  canvas.height = window.innerHeight;
+  ctx.strokeStyle = '#BADA55';
+  ctx.lineJoin = 'round';
+  ctx.lineCap = 'round';
+  ctx.lineWidth = 100;
+  // ctx.globalCompositeOperation = 'multiply';
+  //this would be blending the colors on top of each other
+
+  let isDrawing = false;
+  let lastX = 0;
+  let lastY = 0;
+  let hue = 0;
+  let direction = true;
+  //building up ^
+
+  function draw(e){
+    if (!isDrawing) return;
+    //function won't run if mouse is not down
+    console.log(e);
+    ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`;
+    // ctx.lineWidth = hue;
+    //ctx is where you do all the drawing for the canvas
+    ctx.beginPath();
+    //starting from
+    ctx.moveTo(lastX, lastY);
+    //going to
+    ctx.lineTo(e.offsetX, e.offsetY);
+    ctx.stroke();
+    // lastX = e.offsetX;
+    // lastY = e.offsetY;
+    //or
+
+    //es6
+    [lastX, lastY] = [e.offsetX, e.offsetY];
+    //destructuring an array
+    hue++;
+    //if hsl goes over 360, it will keep going
+    if (hue >= 360){
+      hue = 0
+    }
+    //resetting it
+
+    if(ctx.lineWidth >= 100 || ctx.lineWidth <= 1){
+      direction = !direction;
+    }
+    if (direction){
+      ctx.lineWidth++;
+    } else {
+      ctx.lineWidth--;
+    }
+  }
+
+  canvas.addEventListener('mousedown', (e) => {
+    isDrawing = true;
+    [lastX, lastY] = [e.offsetX, e.offsetY];
+  });
+  canvas.addEventListener('mousemove', draw);
+  canvas.addEventListener('mouseup', () =>
+    isDrawing = false);
+  canvas.addEventListener('mouseout', () =>
+    isDrawing = false);
 </script>
 
 <style>
diff --git a/09 - Dev Tools Domination/index-START.html b/09 - Dev Tools Domination/index-START.html
index 196fffd719..44843f024b 100644
--- a/09 - Dev Tools Domination/index-START.html	
+++ b/09 - Dev Tools Domination/index-START.html	
@@ -18,28 +18,76 @@
     }
 
     // Regular
+    console.log('anything');
 
     // Interpolated
+    console.log('this is a %s string!', 'word');
+    //better version of that ^ is this:
+    const word = 'word';
+    console.log(`this is a ${word} string!`);
 
     // Styled
+    console.log('%c I am some great text', 'font-size: 50px');
+    //changes the font size in the console
 
     // warning!
+    console.warn('sample warning');
+    //will give you stack trace as to where the error was called
 
     // Error :|
+    console.error('sample error');
+    //will display error and give you stack trace
 
     // Info
+    console.info('info statement');
 
     // Testing
+    console.assert(1 === 1, 'That is wrong');
+    //will tell you assertion failed; will only show up if it is false
+    console.assert(4 === 1, 'That is wrong');
+    //this will print
+
+    const p = document.querySelector('p');
+    console.assert(p.classList.contains('ouch'), 'That is incorrect');
 
     // clearing
+    // console.clear();
+
 
     // Viewing DOM Elements
+    console.dir(p);
+    //gives you the dropdown of the properties and methods of the element
 
     // Grouping together
+    dogs.forEach(dog =>{
+      console.groupCollapsed(`${dog.name}`);
+      // console.group(`${dog.name}`);
+        console.log(`This is ${dog.name}`);
+        console.log(`${dog.age} years old`);
+      console.groupEnd(`${dog.name}`);
+
+      })
+
 
     // counting
+    console.count('Mention of things');
+    console.count('Mention of places');
+    console.count('Mention of places');
+    console.count('Mention of places');
+    console.count('Mention of people');
 
     // timing
+    console.log('fetching data');
+    fetch('insert link here')
+    .then(data => data.json())
+    .then(data=>{
+      console.timeEnd('fetching data');
+      console.log(data);
+    })
+    //will tell you how long the fetch took
+
+    console.table(dogs);
+    //use for array of objects that have the same properties
 
   </script>
 </body>
diff --git a/10 - Hold Shift and Check Checkboxes/index-START.html b/10 - Hold Shift and Check Checkboxes/index-START.html
index eb7ed310bb..b83e728cd0 100644
--- a/10 - Hold Shift and Check Checkboxes/index-START.html	
+++ b/10 - Hold Shift and Check Checkboxes/index-START.html	
@@ -104,6 +104,37 @@
   </div>
 
 <script>
+const checkboxes = document.querySelectorAll('.inbox input[type="checkbox"]')
+
+let lastChecked;
+
+function handleCheck(e){
+
+  let inBetween = false;
+  if (e.shiftKey && this.checked){
+    //loop over all checkboxes
+    //see which was first
+    //see which is last
+    checkboxes.forEach(checkbox => {
+      console.log(checkbox);
+      if(checkbox === this || checkbox === lastChecked) {
+        inBetween = !inBetween;
+        //inBetween is switched right when first is checked
+      }
+
+      if (inBetween){
+        checkbox.checked = true;
+      }
+      //inBetween is a flag variable
+      });
+    }
+  lastChecked = this;
+}
+
+
+
+checkboxes.forEach(checkbox => checkbox.addEventListener('click', handleCheck));
+
 </script>
 </body>
 </html>
diff --git a/11 - Custom Video Player/scripts.js b/11 - Custom Video Player/scripts.js
index e69de29bb2..b44fd75c59 100644
--- a/11 - Custom Video Player/scripts.js	
+++ b/11 - Custom Video Player/scripts.js	
@@ -0,0 +1,80 @@
+const player = document.querySelector('.player');
+const video = player.querySelector('.viewer');
+const progress = player.querySelector('.progress');
+const progressBar = player.querySelector('.progress__filled');
+
+const toggle = player.querySelector('.toggle');
+const skipButtons = player.querySelectorAll('[data-skip]');
+const ranges = player.querySelectorAll('.player__slider');
+
+//build out functions
+function togglePlay(){
+  // if(video.paused){
+  //   video.play();
+  // } else {
+  //   video.pause();
+  // }
+  // or use ternary operator
+  const method = video.paused ? 'play' : 'pause';
+  video[method]();
+}
+//.paused is a property that lives on the video, no playing property
+
+function updateButton(){
+  const icon = this.paused ? '>' : '||';
+  //the this is bound to the video
+  toggle.textContent = icon;
+  console.log('Update the button');
+  //
+}
+
+function skip(){
+  console.log(this.dataset.skip);
+  //object with value of -10 or 25 for the two buttons
+  video.currentTime += parseFloat(this.dataset.skip);
+  //parseFloat converts into true number
+}
+
+function handleRangeUpdate(){
+  video[this.name] = this.value;
+  // video['volume']
+  // video['playbackRate']
+  //volume and playbackRate are the two properties you want to update
+  console.log(this.name);
+  console.log(this.value);
+}
+
+function handleProgress(){
+  const percent = (video.currentTime / video.duration) * 100;
+  //currentTime and duration are properties on the video
+  progressBar.style.flexBasis = `${percent}%`;
+}
+
+function scrub(e){
+  const scrubTime = (e.offsetX / progress.offsetWidth) * video.duration;
+  //offsetWidth will give you entire width of bar
+  //then update
+  video.currentTime = scrubTime;
+  console.log(e)
+}
+
+video.addEventListener('click', togglePlay);
+
+video.addEventListener('play', updateButton);
+video.addEventListener('pause', updateButton);
+
+video.addEventListener('timeupdate', handleProgress);
+
+toggle.addEventListener('click', togglePlay);
+skipButtons.forEach(button => button.addEventListener('click', skip));
+ranges.forEach(range => range.addEventListener('change', handleRangeUpdate));
+ranges.forEach(range => range.addEventListener('mousemove', handleRangeUpdate));
+
+let mousedown = false;
+//flag variable
+progress.addEventListener('click', scrub);
+progress.addEventListener('mousemove', (e) => mousedown && scrub(e));
+//will first check the variable mousedown, if true it moves onto function
+
+progress.addEventListener('mousedown', () => mousedown=true);
+progress.addEventListener('mouseup', () => mousedown=false);
diff --git a/12 - Key Sequence Detection/index-START.html b/12 - Key Sequence Detection/index-START.html
index 8cab786140..28654f7aac 100644
--- a/12 - Key Sequence Detection/index-START.html	
+++ b/12 - Key Sequence Detection/index-START.html	
@@ -7,6 +7,23 @@
 </head>
 <body>
 <script>
+const pressed =[];
+const secretCode = 'wesbos';
+
+window.addEventListener('keyup', (e) => {
+  console.log(e.key);
+  pressed.push(e.key);
+  pressed.splice(-secretCode.length - 1, pressed.length - secretCode.length);
+  //negative will take it from the end of the array
+
+  if(pressed.join('').includes(secretCode)){
+    console.log('yep!');
+  cornify_add();
+  //will give you random unicorns on the screen!
+  }
+
+  console.log(pressed);
+})
 </script>
 </body>
 </html>
diff --git a/13 - Slide in on Scroll/index-START.html b/13 - Slide in on Scroll/index-START.html
index 0b9fb8fccb..f90a3dd89e 100644
--- a/13 - Slide in on Scroll/index-START.html	
+++ b/13 - Slide in on Scroll/index-START.html	
@@ -58,6 +58,33 @@ <h1>Slide in on Scroll</h1>
       };
     }
 
+
+    const sliderImages = document.querySelectorAll('.slide-in');
+
+    function checkSlide(e) {
+      console.count(e);
+      sliderImages.forEach(sliderImage => {
+        const slideInAt = (window.scrollY + window.innerHeight) - sliderImage.height / 2;
+        //window.scrollY calculates from the top of the window
+        //we want from the bottom of the window
+        //pixel level where the image should be scrolled in
+
+        const imageBottom = sliderImage.offsetTop + sliderImage.height
+        //offsetTop - top of this image is this far from top of window
+        //add height of image to get the bottom of the img
+
+        const isHalfShown = slideInAt > sliderImage.offsetTop;
+        const isNotScrolledPast = window.scrollY < imageBottom;
+        if (isHalfShown && isNotScrolledPast){
+          sliderImage.classList.add('active');
+        } else {
+          sliderImage.classList.remove('active');
+        }
+      });
+    }
+
+    window.addEventListener('scroll', debounce(checkSlide));
+
   </script>
 
   <style>