diff --git a/workouts/js-conditionals.js b/workouts/js-conditionals.js
index 322cfac..d657ad8 100644
--- a/workouts/js-conditionals.js
+++ b/workouts/js-conditionals.js
@@ -2,8 +2,8 @@
 
 export default [
    {
-      content: `  var widgets = ##;
-  var gadgets = ##;
+      content: `  let widgets = ##;
+  let gadgets = ##;
   
   if(widgets > gadgets){
     widgets = widgets - gadgets;
@@ -11,8 +11,8 @@ export default [
       solveFor: 'widgets',
    },
    {
-      content: `  var count = ##;
-  var howMany = "a few";
+      content: `  const count = ##;
+  let howMany = "a few";
 
   if(count >= ##){
     howMany = "So many!"
@@ -20,8 +20,8 @@ export default [
       solveFor: 'howMany',
    },
    {
-      content: `   var age = ##;
-    var canVote;
+      content: `   let age = ##;
+    let canVote;
 
     if(age >= 18){
       canVote = true;
@@ -33,8 +33,8 @@ export default [
    },
    {
       content: `
-    var babyStartedWalking = #-#; //months old
-    var howTheyDoin;
+    const babyStartedWalking = #-#; //months old
+    let howTheyDoin;
 
     if(babyStartedWalking < 8){
       howTheyDoin = "Dang baby, how you doin' that??";
@@ -49,8 +49,8 @@ export default [
       solveFor: 'howTheyDoin',
    },
    {
-      content: `    var inchesOfSnow = ##;
-    var schoolStatus;
+      content: `    let inchesOfSnow = ##;
+    let schoolStatus;
 
     if(inchesOfSnow >= 5){
       schoolStatus = "Cancel";
@@ -64,8 +64,8 @@ export default [
       solveFor: 'schoolStatus',
    },
    {
-      content: `    var inchesOfSnow = ##;
-    var schoolStatus;
+      content: `    let inchesOfSnow = ##;
+    let schoolStatus;
 
     if(inchesOfSnow < 1){
       schoolStatus = "Open";
@@ -79,9 +79,9 @@ export default [
       solveFor: 'schoolStatus',
    },
    {
-      content: `    var inchesOfSnow = ##;
-    var iceAmount = #.# //fraction of inch ice
-    var schoolStatus;
+      content: `    let inchesOfSnow = ##;
+    let iceAmount = #.# //fraction of inch ice
+    let schoolStatus;
 
     if(inchesOfSnow >= 5){
       schoolStatus = "Snow - Cancel";
@@ -100,9 +100,9 @@ export default [
       solveFor: 'schoolStatus',
    },
    {
-      content: `    var inchesOfSnow = ##;
-    var iceAmount = #.# //fraction of inch ice
-    var schoolStatus;
+      content: `    let inchesOfSnow = ##;
+    let iceAmount = #.#; //fraction of inch ice
+    let schoolStatus;
 
     if(inchesOfSnow >= 5){
       schoolStatus = "Snow - Cancel";
@@ -126,9 +126,9 @@ export default [
       solveFor: 'schoolStatus',
    },
    {
-      content: `    var inchesOfSnow = ##;
-    var iceAmount = #.# //fraction of inch ice
-    var schoolStatus;
+      content: `    let inchesOfSnow = ##;
+    let iceAmount = #.#; //fraction of inch ice
+    let schoolStatus;
 
     if(inchesOfSnow >= 5){
       schoolStatus = "Snow - Cancel";
@@ -145,7 +145,7 @@ export default [
       solveFor: 'schoolStatus',
    },
    {
-      content: `    var x = ## + 3;
+      content: `    let x = ## + 3;
 
     if(x > 5){
       x = 10;
@@ -153,7 +153,7 @@ export default [
       solveFor: 'x',
    },
    {
-      content: `    var x = ## + 3;
+      content: `    let x = ## + 3;
 
     if(x > 5){
       x = 10;
@@ -165,9 +165,9 @@ export default [
       solveFor: 'x',
    },
    {
-      content: `    var age = ## + 7;
-    var canHuntDeer = age > 12;
-    var answer = "No";
+      content: `    let age = ## + 7;
+    let canHuntDeer = age > 12;
+    let answer = "No";
 
     if(canHuntDeer){
       answer = "Yes";
@@ -175,10 +175,10 @@ export default [
       solveFor: 'answer',
    },
    {
-      content: `    var age = ## + 7;
-    var canRideBike = **;
-    var bigKid = age > 10 && canRideBike;
-    var answer = "No";
+      content: `    let age = ## + 7;
+    let canRideBike = **;
+    let bigKid = age > 10 && canRideBike;
+    let answer = "No";
  
     `,
       solveFor: 'answer',
@@ -187,7 +187,7 @@ export default [
       content: `  
     
     
-    var yay = "All done. Nice work!"`,
+    var let = "All done. Nice work!"`,
       solveFor: 'yay',
    },
 ];
diff --git a/workouts/js-functions.js b/workouts/js-functions.js
index e8987e3..c41fc87 100644
--- a/workouts/js-functions.js
+++ b/workouts/js-functions.js
@@ -3,43 +3,43 @@ export default [
    {
       content: `
        function doThisThing(num){
-          return num + num
+          return num + num;
        }
        `,
       solveFor: 'doThisThing(##)',
    },
    {
       content: `
-      var num = ##
+      let num = ##;
        function doThisThing(){
-          return num + num
+          return num + num;
        }
        `,
       solveFor: 'doThisThing()',
    },
    {
       content: `
-      var count = ##;
+      let count = ##;
        function doThisThing(num){
-          return num + num
+          return num + num;
        }
        `,
       solveFor: 'doThisThing(##)',
    },
    {
       content: `
-      var num = ##;
+      let num = ##;
 
        function doThisThing(num){
           // i'm bored
-          return num + num
+          return num + num;
        }
        `,
       solveFor: 'num',
    },
    {
       content: `
-      var num = #-#;
+      let num = #-#;
 
        function doThisThing(num){
           // fire the person who named this parameter num
@@ -50,7 +50,7 @@ export default [
    },
    {
       content: `
-      var num = ##;
+      let num = ##;
        function doThisThing(){
           //not sure why you'd ever do this... but...
           var num = ##;
@@ -60,10 +60,10 @@ export default [
    },
    {
       content: `
-      var num = #-#;
+      let num = #-#;
        function doThisThing(num){
           // which num is it?
-          num = num + num
+          num = num + num;
           return num;
        }
        `,
@@ -71,90 +71,90 @@ export default [
    },
    {
       content: `
-      var num = ##;
+      let num = ##;
        function doThisThing(){
           // you'd probably never do this but...
           var num = #-#;
           // which num is it?
-          return num
+          return num;
        }
        `,
       solveFor: 'doThisThing()',
    },
    {
       content: `
-      var num = #-#;
+      let num = #-#;
        function doThisThing(){
           var num = ##;
-          return num * num
+          return num * num;
        }
        `,
       solveFor: 'doThisThing()',
    },
    {
-      content: `  var num = ##;
+      content: `  let num = ##;
    function doThisThing(){
-      num += ##
+      num += ##;
    }
-   doThisThing()
+   doThisThing();
    `,
       solveFor: 'num',
    },
    {
-      content: `  var num = #-#;
+      content: `  let num = #-#;
     function doThisThing(){
-       num += ##
+       num += ##;
     }
     `,
       solveFor: 'num',
    },
    {
-      content: `  var num = ##;
+      content: `  let num = ##;
    function doThisThing(){
-      num += ##
+      num += ##;
    }
-   doThisThing()
-   doThisThing()
+   doThisThing();
+   doThisThing();
    `,
       solveFor: 'num',
    },
    {
-      content: `  var num = ##;
+      content: `  let num = ##;
    function doSomething(){
-      num += ##
+      num += ##;
    }
    function doSomethingElse(){
-      num -= ##
+      num -= ##;
    }
-   doSomething()
-   doSomethingElse()
-   doSomething()
+   doSomething();
+   doSomethingElse();
+   doSomething();
    `,
       solveFor: 'num',
    },
    {
-      content: `  var num = ##;
+      content: `  let num = ##;
    function addTen(){
-      num += 10
-      subtractFive()
+      num += 10;
+      subtractFive();
    }
    function subtractFive(){
-      num -= 5
+      num -= 5;
    }
-   addTen()
+   addTen();
    `,
       solveFor: 'num',
    },
    {
-      content: `  var num = ##;
+      content: `  let num = ##;
    function addTen(){
-      num += 10
-      subtractFive()
+      num += 10;
+      subtractFive();
    }
    function subtractFive(){
-      num -= 5
+      num -= 5;
    }
-   subtractFive()
+   subtractFive();
    `,
       solveFor: 'num',
    },
@@ -172,9 +172,9 @@ export default [
       return thing.length;
    }
    function whoKnows(){
-      var you = ^^
-      var yourFriend = ^^
-      return you + yourFriend
+      let you = ^^;
+      let yourFriend = ^^;
+      return you + yourFriend;
    }
    `,
       solveFor: 'whatDoWeDo(whoKnows())',
@@ -182,25 +182,25 @@ export default [
    {
       content: `
    function timeToFeed(person, pet){
-      return person + "\'s " + pet
+      return person + "\'s " + pet;
    }
    `,
       solveFor: 'timeToFeed(^^, @@)',
    },
    {
       content: `
-      var age = #-#
+      let age = #-#
    function howOld(person){
       // this would be dumb to do...
-      var age = ##
+      let age = ##;
       // ...but...
-      return person + " is " + age
+      return person + " is " + age;
    }
    `,
       solveFor: 'howOld(^^)',
    },
    {
-      content: `  var num = #-#;
+      content: `  let num = #-#;
    function doThisThing(){
       return num - ##;
    }
@@ -220,7 +220,7 @@ export default [
    {
       content: `// multiple returns is pretty normal
 
-      var count = #-#;
+      let count = #-#;
 
    function whatsItDo(name){
       if(name.length >= 5){
@@ -235,7 +235,7 @@ export default [
    {
       content: `
 
-      var count = #-#;
+      let count = #-#;
 
    function andThisOneToo(name){
       if(name.length >= 5){
@@ -244,7 +244,7 @@ export default [
       return count;
    }
    // This'd be for using answer later, multiple times
-   var answer = andThisOneToo($$)
+   let answer = andThisOneToo($$)
 
    `,
       solveFor: 'answer',
@@ -252,7 +252,7 @@ export default [
    {
       content: `
       
-      var total = #-#;
+      let total = #-#;
 
    function andThis(thing1, thing2){
       if(thing1.length >= 5){
@@ -262,10 +262,10 @@ export default [
    }
 
    function whatsThis(amt){
-      return "$" + amt + "k"
+      return "$" + amt + "k";
    }
 
-   var answer = whatsThis(andThis(@@, @@))
+   let answer = whatsThis(andThis(@@, @@))
 
    `,
       solveFor: 'answer',
diff --git a/workouts/js-lists.js b/workouts/js-lists.js
index f951d22..713a032 100644
--- a/workouts/js-lists.js
+++ b/workouts/js-lists.js
@@ -3,7 +3,7 @@
 export default [
    {
       content: `
-               var names = [^^, ^^, ^^]
+               const names = [^^, ^^, ^^];
 
                `,
       solveFor: 'names.length',
@@ -12,7 +12,7 @@ export default [
       content: `
          // zero is actually the first number
 
-               var ages = [##, ##, ##]
+               const ages = [##, ##, ##];
 
                `,
       solveFor: 'ages[0]',
@@ -20,37 +20,37 @@ export default [
    {
       content: `
 
-                  var letters = [~~, ~~, ~~]
+                  const letters = [~~, ~~, ~~];
 
                   `,
       solveFor: 'letters[1]',
    },
    {
       content: `
-               var weights = [#-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#]
+               const weights = [#-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#]
 
                `,
       solveFor: 'weights[##]',
    },
    {
       content: `
-               var names = [^^, ^^, ^^]
+               const names = [^^, ^^, ^^];
 
                `,
       solveFor: 'names[0].length',
    },
    {
       content: `
-                  var votes = [#-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#]
+                  const votes = [#-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#];
 
-                  var result = votes[0] + votes[1]
+                  let result = votes[0] + votes[1];
 
                   `,
       solveFor: 'result',
    },
    {
       content: `
-                     var names = [^^, ^^, ^^]
+                     const names = [^^, ^^, ^^];
 
                      `,
       solveFor: 'names[names.length - 1]',
@@ -59,19 +59,19 @@ export default [
       content: `
          // sometimes .length means different things
 
-                  var names = [^^, ^^, ^^]
+                  const names = [^^, ^^, ^^];
 
                   `,
       solveFor: 'names[names.length - 1].length',
    },
    {
       content: `
-                  var wildBeasts = [@@, @@, @@]
-                  var gentlePets = [@@, @@, @@]
+                  const wildBeasts = [@@, @@, @@];
+                  const gentlePets = [@@, @@, @@];
 
-                  var temp = wildBeasts[1]
-                  wildBeasts[1] = gentlePets[2]
-                  gentlePets[2] = temp
+                  let temp = wildBeasts[1];
+                  wildBeasts[1] = gentlePets[2];
+                  gentlePets[2] = temp;
 
                   `,
       solveFor: 'wildBeasts[1]',
@@ -79,15 +79,15 @@ export default [
    {
       content: `
 
-                     var descriptions = [$$, $$, $$]
-                     descriptions[descriptions.length] = $$
+                     const descriptions = [$$, $$, $$];
+                     descriptions[descriptions.length] = $$;
 
                      `,
       solveFor: 'descriptions[3]',
    },
    {
       content: `
-                  var votes = [#-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#,#-#, #-#, #-#]
+                  const votes = [#-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#,#-#, #-#, #-#];
 
                   `,
       solveFor: 'votes.indexOf(#-#)',
@@ -95,8 +95,8 @@ export default [
    {
       content: `
 
-                     var descriptions = [$$, $$, $$]
-                     descriptions.push($$)
+                     const descriptions = [$$, $$, $$];
+                     descriptions.push($$);
 
                      `,
       solveFor: 'descriptions[3]',
@@ -104,71 +104,71 @@ export default [
    {
       content: `
 
-                     var descriptions = [$$, $$, $$, $$]
-                     descriptions.push($$)
+                     const descriptions = [$$, $$, $$, $$];
+                     descriptions.push($$);
 
                      `,
       solveFor: 'descriptions.length',
    },
    {
       content: `
-                  var scores = [#-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#]
-                  var result = Math.max(...scores)
+                  const scores = [#-#, #-#, #-#, #-#, #-#, #-#, #-#, #-#];
+                  let result = Math.max(...scores);
 
                   `,
       solveFor: 'result',
    },
    {
       content: `
-                  var scores = [#-#, #-#, #-#, #-#, #-#, #-#, #-#]
-                  var result = Math.min(...scores)
+                  const scores = [#-#, #-#, #-#, #-#, #-#, #-#, #-#];
+                  let result = Math.min(...scores);
 
                   `,
       solveFor: 'scores.indexOf(result)',
    },
    {
       content: `
-                     var veterinaryWaitingRoom = [@@, @@, @@, @@, @@, @@]
-                     veterinaryWaitingRoom.pop()
+                     const veterinaryWaitingRoom = [@@, @@, @@, @@, @@, @@];
+                     veterinaryWaitingRoom.pop();
 
                      `,
       solveFor: 'veterinaryWaitingRoom.length',
    },
    {
       content: `
-                     var stillWaiting = [@@, @@, @@, @@, @@, @@, @@]
-                     stillWaiting.pop()
+                     const stillWaiting = [@@, @@, @@, @@, @@, @@, @@];
+                     stillWaiting.pop();
 
                      `,
       solveFor: 'stillWaiting[stillWaiting.length-1]',
    },
    {
       content: `
-                  var naughtyList = [^^, ^^, ^^, ^^]
-                  var hottyList = [^^, ^^, ^^]
-                  var naughtyHottyList = naughtyList.concat(hottyList)
+                  const naughtyList = [^^, ^^, ^^, ^^];
+                  const hottyList = [^^, ^^, ^^];
+                  let naughtyHottyList = naughtyList.concat(hottyList);
 
                   `,
       solveFor: 'naughtyHottyList[naughtyHottyList.length-1]',
    },
    {
       content: `
-                  var deadly = [@@, @@, @@, @@ ]
-                  var cuddly = [@@, @@, @@, @@, @@, @@]
-                  deadly.pop()
+                  const deadly = [@@, @@, @@, @@ ];
+                  const cuddly = [@@, @@, @@, @@, @@, @@];
+                  deadly.pop();
 
-                  cuddly = cuddly.concat(deadly)
+                  cuddly = cuddly.concat(deadly);
 
                   `,
       solveFor: 'cuddly[##]',
    },
    {
       content: `
-                  var deadly = [@@, @@, @@, @@ ]
-                  var cuddly = [@@, @@, @@, @@, @@, @@]
-                  deadly.pop()
+                  const deadly = [@@, @@, @@, @@ ];
+                  const cuddly = [@@, @@, @@, @@, @@, @@];
+                  deadly.pop();
 
-                  cuddly = deadly.concat(cuddly)
+                  cuddly = deadly.concat(cuddly);
 
                   `,
       solveFor: 'cuddly[##]',
@@ -176,72 +176,72 @@ export default [
    {
       content: `
 
-               var letters = [~~, ~~, ~~]
-               var andNow = letters.join("")
+               const letters = [~~, ~~, ~~];
+               let andNow = letters.join("");
                `,
       solveFor: 'andNow',
    },
    {
       content: `
 
-               var letters = [~~, ~~, ~~]
-               var butHere = letters.join("-")
+               const letters = [~~, ~~, ~~];
+               let butHere = letters.join("-");
                `,
       solveFor: 'butHere',
    },
    {
       content: `
 
-               var letters = [~~, ~~, ~~]
-               var maybeAlso = letters.join(~~)
+               const letters = [~~, ~~, ~~];
+               let maybeAlso = letters.join(~~);
                `,
       solveFor: 'maybeAlso',
    },
    {
       content: `
 
-               var letters = [~~, ~~, ~~]
-               var butUsually = letters.join()
+               const letters = [~~, ~~, ~~];
+               let butUsually = letters.join();
                `,
       solveFor: 'butUsually',
    },
    {
       content: `
 
-               var name = "Genevieve"
-               var splitUp = name.split('e')
+               let name = "Genevieve";
+               let splitUp = name.split('e');
                `,
       solveFor: 'splitUp[0]',
    },
    {
       content: `
 
-               var name = "Genevieve"
-               var splitUp = name.split('v')
+               let name = "Genevieve";
+               let splitUp = name.split('v');
                `,
       solveFor: 'splitUp[0]',
    },
    {
       content: `
 
-               var name = "Genevieve"
-               var splitUp = name.split('ev')
+               let name = "Genevieve";
+               let splitUp = name.split('ev');
                `,
       solveFor: 'splitUp[1]',
    },
    {
       content: `
 
-               var someStuff = "First Name, Last Name, Age, Height, Weight, Eye Color, DOB, Address, Organ Donor"
-               var likeThis = someStuff.split(', ')
+               let someStuff = "First Name, Last Name, Age, Height, Weight, Eye Color, DOB, Address, Organ Donor";
+               let likeThis = someStuff.split(', ');
                `,
       solveFor: 'likeThis[##]',
    },
    {
       content: `
 
-               var aSentence = !!
-               var orThis = aSentence.split(' ')
+               let aSentence = !!;
+               let orThis = aSentence.split(' ');
                `,
       solveFor: 'orThis[2]',
    },
@@ -249,8 +249,8 @@ export default [
       content: `
         // and finally, some weird nonsense
         
-         var passCode = "The " + $$ + @@ + " named " + ^^ + "!"
-         var parts = passCode.split('e')
+         let passCode = "The " + $$ + @@ + " named " + ^^ + "!";
+         let parts = passCode.split('e');
          `,
       solveFor: 'parts.length',
    },
diff --git a/workouts/js-loops.js b/workouts/js-loops.js
index 9f38166..5455d89 100644
--- a/workouts/js-loops.js
+++ b/workouts/js-loops.js
@@ -2,7 +2,7 @@
 export default [
    {
       content: `
-        var num = 0;
+        let num = 0;
 
         while(num < #-#){
           num = num +1
@@ -13,10 +13,10 @@ export default [
    },
    {
       content: `
-     var num = #-#;
+     let num = #-#;
 
      while(num < ##){
-       num = num - 1
+       num = num - 1;
      }
 
       `,
@@ -24,10 +24,10 @@ export default [
    },
    {
       content: `
-     var num = #-#;
+     let num = #-#;
 
      while(num >= ##){
-       num = num - 1
+       num = num - 1;
      }
 
       `,
@@ -35,10 +35,10 @@ export default [
    },
    {
       content: `
-     var num = #-#;
+     let num = #-#;
 
      while(num > ##){
-       num = num - 1
+       num = num - 1;
      }
 
       `,
@@ -46,10 +46,10 @@ export default [
    },
    {
       content: `
-     var num = 15;
+     let num = 15;
 
      while(num == 15){
-       num = num - ##
+       num = num - ##;
      }
 
       `,
@@ -57,11 +57,11 @@ export default [
    },
    {
       content: `
-       var num = ##;
+       let num = ##;
        count = 0;
        while(num < #-#){
-         num = num + 1
-         count = count + 2
+         num = num + 1;
+         count = count + 2;
        }
 
         `,
@@ -69,9 +69,9 @@ export default [
    },
    {
       content: `
-     var count = ##;
-    for(var i = 0; i < ##; i++){
-     count = count + 1
+     let count = ##;
+    for(let i = 0; i < ##; i++){
+     count = count + 1;
     }
 
       `,
@@ -80,9 +80,9 @@ export default [
 
    {
       content: `
-     var count = #-#;
-    for(var i = 0; i < ##; i++){
-     count = count - 1
+     let count = #-#;
+    for(let i = 0; i < ##; i++){
+     count = count - 1;
     }
 
       `,
@@ -90,10 +90,10 @@ export default [
    },
    {
       content: `
-     var count = #-#;
-     var amt = ##
-    for(var i = 0; i < 3; i++){
-     count = count - amt
+     let count = #-#;
+     let amt = ##;
+    for(let i = 0; i < 3; i++){
+     count = count - amt;
     }
 
       `,
@@ -101,11 +101,11 @@ export default [
    },
    {
       content: `
-     var count = #-#;
-     var amt = ##
-    for(var i = 0; i < 3; i++){
+     let count = #-#;
+     let amt = ##;
+    for(let i = 0; i < 3; i++){
       if(count > ##){
-        count = count - amt
+        count = count - amt;
       }
 
     }
@@ -115,14 +115,14 @@ export default [
    },
    {
       content: `
-     var count = #-#;
-     var amt = ##
-    for(var i = 0; i < 3; i++){
+     let count = #-#;
+     let amt = ##;
+    for(let i = 0; i < 3; i++){
      if(count > #-#){
-       count = count - amt
+       count = count - amt;
      }
      else {
-       count = count + 1
+       count = count + 1;
      }
     }
 
@@ -131,14 +131,14 @@ export default [
    },
    {
       content: `
-     var count = #-#;
-     var amt = ##
-    for(var i = 0; i < 3; i++){
+     let count = #-#;
+     let amt = ##;
+    for(let i = 0; i < 3; i++){
      if(count > #-#){
-       count = count - amt
+       count = count - amt;
      }
      else {
-       count = count + 1
+       count = count + 1;
      }
     }
 
@@ -147,9 +147,9 @@ export default [
    },
    {
       content: `
-  var count = 0;
- for(var i = 0; i < 3000; i++){
-  count = count + 1
+  let count = 0;
+ for(let i = 0; i < 3000; i++){
+  count = count + 1;
  }
 
    `,
diff --git a/workouts/js-variables.js b/workouts/js-variables.js
index ab1ace9..c4cde3c 100644
--- a/workouts/js-variables.js
+++ b/workouts/js-variables.js
@@ -1,159 +1,159 @@
 /* eslint-disable import/no-anonymous-default-export */
 export default [
   {
-    content: `  var num = ##;`,
+    content: `  let num = ##;`,
     solveFor: "num",
   },
   {
-    content: `  var count = ##;
+    content: `  let count = ##;
    count = count + ##;`,
     solveFor: "count",
   },
   {
-    content: `  var x = #-#;
+    content: `  let x = #-#;
           x = x - ##;     `,
     solveFor: "x",
   },
   {
-    content: `  var counter = ##;
+    content: `  let counter = ##;
          counter += ##;    `,
     solveFor: "counter",
   },
   {
-    content: `  var counter = ##;
+    content: `  let counter = ##;
          counter++;    `,
     solveFor: "counter",
   },
   {
-    content: `  var counter = ##;
+    content: `  let counter = ##;
     counter--;    `,
     solveFor: "counter",
   },
   {
-    content: `  var i = ##;
-         i -= ##;    ;
+    content: `  let i = ##;
+         i -= ##;    
              `,
     solveFor: "i",
   },
   {
-    content: `  var a = ##;
-          var b = ##
-          b = a
+    content: `  let a = ##;
+          let b = ##;
+          b = a;
           `,
     solveFor: "b",
   },
   {
-    content: `  var num1 = ##;
-          var num2 = ##
-          num1 = num2
+    content: `  let num1 = ##;
+          let num2 = ##;
+          num1 = num2;
           `,
     solveFor: "num1",
   },
   {
-    content: `  var i = ##;
-          var j = ##
-          i = i + j
+    content: `  let i = ##;
+          let j = ##;
+          i = i + j;
           `,
     solveFor: "i",
   },
   {
-    content: `  var x = ##;
-          var y = ##
-          x += y
+    content: `  let x = ##;
+          let y = ##;
+          x += y;
           `,
     solveFor: "x",
   },
   {
-    content: `  var a = ##;
-          var b = ##
-          var c;
-          c = a
-          a = b
-          b = c
+    content: `  let a = ##;
+          let b = ##;
+          let c;
+          c = a;
+          a = b;
+          b = c;
           `,
     solveFor: "c",
   },
   {
-    content: `  var a = ##;
-          var b = ##
-          var c;
-          c = a
-          a = b
-          b = c
+    content: `  let a = ##;
+          let b = ##;
+          let c;
+          c = a;
+          a = b;
+          b = c;
           `,
     solveFor: "a",
   },
   {
-    content: `  var a = ##;
-          var b = ##
-          var c;
-          c = a
-          a = b
-          b = c
+    content: `  let a = ##;
+          let b = ##;
+          let c;
+          c = a;
+          a = b;
+          b = c;
           `,
     solveFor: "b",
   },
   {
-    content: `  var radius = ##;
-         var diameter = radius * 2
+    content: `  let radius = ##;
+         let diameter = radius * 2
          `,
     solveFor: "diameter",
   },
   {
     content: `
-       var r = #-#
-       var s = r/2
-       r = s
-       r *= 2
+       let r = #-#;
+       let s = r/2;
+       r = s;
+       r *= 2;
          `,
     solveFor: "r",
   },
   {
     content: `
-       var t;
-       var u = ##
-       var v = @@
-       t = v + u
+       let t;
+       let u = ##;
+       let v = @@;
+       t = v + u;
          `,
     solveFor: "t",
   },
   {
     content: `
-        var t;
-        var u = ##
-        var v = @@
-        t = v + u
+        let t;
+        let u = ##;
+        let v = @@;
+        t = v + u;
           `,
     solveFor: "t",
   },
   {
     content: `
-       var result = $$ + " " + @@
+       let result = $$ + " " + @@;
          `,
     solveFor: "result",
   },
   {
     content: `
-       var adjective = $$
-       var animal = @@
-       var result = adjective + " " + animal
+       let adjective = $$;
+       let animal = @@;
+       let result = adjective + " " + animal;
          `,
     solveFor: "result",
   },
   {
     content: `
-      var adjective = $$
-      var animal = @@
-      var person = ^^
-      var result = adjective + " " + person
+      let adjective = $$;
+      let animal = @@;
+      let person = ^^;
+      let result = adjective + " " + person;
         `,
     solveFor: "result",
   },
   {
     content: `
-      var person = ^^
-      var animal = @@
-      var result = person + " has an " + animal
+      let person = ^^;
+      let animal = @@;
+      let result = person + " has an " + animal;
         `,
     solveFor: "result",
   },