diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98cc.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98cc.md
index 6295eb77a14..7b5349e6ef3 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98cc.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98cc.md
@@ -28,7 +28,7 @@ assert.strictEqual(headElements?.length, 1);
 You should have one void `link` element.
 
 ```js
-assert.strictEqual(document.querySelectorAll('link')?.length, 1);
+assert.lengthOf(document.querySelectorAll('link'), 1);
 ```
 
 Your `link` element should be within your `head` element.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98cd.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98cd.md
index 866b58f80ce..f9c4e52bb53 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98cd.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98cd.md
@@ -20,7 +20,7 @@ assert.exists(new __helpers.CSSHelp(document).getStyle('*'));
 You should use the `border` property to style all the elements.
 
 ```js
-assert(new __helpers.CSSHelp(document).isPropertyUsed('border'));
+assert.exists(new __helpers.CSSHelp(document).isPropertyUsed('border'));
 ```
 
 All elements should have a `1px solid black` border.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ce.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ce.md
index 1ea4cc4156d..1e37ee99831 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ce.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ce.md
@@ -14,14 +14,14 @@ Also add a `box-sizing` of `border-box` to everything. This will make it so the
 You should use the `box-sizing` property.
 
 ```js
-assert(new __helpers.CSSHelp(document).isPropertyUsed('box-sizing'));
+assert.exists(new __helpers.CSSHelp(document).isPropertyUsed('box-sizing'));
 ```
 
 You should make use of the existing `*` selector.
 
 ```js
 // Two selectors create two CSSStyleRule objects
-assert.equal(new __helpers.CSSHelp(document).getStyleDeclarations('*').length, 1);
+assert.lengthOf(new __helpers.CSSHelp(document).getStyleDeclarations('*'), 1);
 ```
 
 All elements should have a `box-sizing` of `border-box`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d0.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d0.md
index a49b3f5dff7..6504d14731b 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d0.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d0.md
@@ -20,13 +20,13 @@ assert.exists(document.querySelector('div'));
 Your `div` element should be within the `body`.
 
 ```js
-assert(document.querySelector('div')?.parentElement?.localName === 'body');
+assert.equal(document.querySelector('div')?.parentElement?.localName, 'body');
 ```
 
 Your `div` element should have a class of `background-buildings`
 
 ```js
-assert([...document.querySelector('div')?.classList]?.includes('background-buildings'));
+assert.isTrue([...document.querySelector('div')?.classList]?.includes('background-buildings'));
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d3.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d3.md
index 45826ef23c2..1e1de274f94 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d3.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d3.md
@@ -47,7 +47,7 @@ You should place the new `div` elements in the correct order.
 function __t(a, b) {
   return [...document.querySelector(a)?.nextElementSibling?.classList]?.includes(b);
 }
-assert(__t('div.bb1a','bb1b') && __t('div.bb1b','bb1c') && __t('div.bb1c','bb1d'));
+assert.isTrue(__t('div.bb1a','bb1b') && __t('div.bb1b','bb1c') && __t('div.bb1c','bb1d'));
 ```
 
 You should place the new `div` elements within the `.bb1` element.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d6.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d6.md
index f0684b658c0..606789bbf27 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d6.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d6.md
@@ -14,7 +14,7 @@ Now you have something that is resembling a building. You are ready to create yo
 You should create a new variable named `--building-color1`.
 
 ```js
-assert(new __helpers.CSSHelp(document).isPropertyUsed('--building-color1'));
+assert.exists(new __helpers.CSSHelp(document).isPropertyUsed('--building-color1'));
 ```
 
 You should define the `--building-color1` variable within `.bb1`.
@@ -26,7 +26,7 @@ assert.exists(new __helpers.CSSHelp(document).getStyle('.bb1')?.getPropertyValue
 You should give `--building-color1` a value of `#999`.
 
 ```js
-assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1')?.getPropertyValue('--building-color1').trim(),'#999');
+assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1')?.getPropertyValue('--building-color1').trim(), '#999');
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d9.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d9.md
index 3690866c537..5b6af5ffb54 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d9.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98d9.md
@@ -14,7 +14,7 @@ Change the value of your variable from `#999` to `#aa80ff` and you can see how i
 You should change the value of the `--building-color1` property variable from `#999` to `#aa80ff`.
 
 ```js
-assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1')?.getPropertyValue('--building-color1').trim(),'#aa80ff');
+assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1')?.getPropertyValue('--building-color1').trim(), '#aa80ff');
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98da.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98da.md
index 9096cdb2f72..6bb8e059160 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98da.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98da.md
@@ -32,13 +32,13 @@ assert.exists(document.querySelector('div.bb4'));
 You should create 3 new `div` elements.
 
 ```js
-assert.equal(document.querySelectorAll('div')?.length, 9);
+assert.lengthOf(document.querySelectorAll('div'), 9);
 ```
 
 You should place these `div` elements within the `.background-buildings` element.
 
 ```js
-assert.equal(document.querySelector('div.background-buildings')?.children?.length, 4);
+assert.lengthOf(document.querySelector('div.background-buildings')?.children, 4);
 ```
 
 You should place the elements in the correct order.
@@ -47,7 +47,7 @@ You should place the elements in the correct order.
 function __t(a, b) {
   return [...document.querySelector(a)?.nextElementSibling?.classList]?.includes(b);
 }
-assert(__t('div.bb1','bb2') && __t('div.bb2','bb3') && __t('div.bb3','bb4'));
+assert.isTrue(__t('div.bb1','bb2') && __t('div.bb2','bb3') && __t('div.bb3','bb4'));
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98dd.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98dd.md
index d9ac91dbc64..06002d8fdb2 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98dd.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98dd.md
@@ -15,14 +15,14 @@ You should add two new `div` elements before the `.bb1` element.
 
 ```js
 const bBuildings = document.querySelector('.background-buildings')?.children;
-assert(![...bBuildings?.[0]?.classList]?.includes('bb1'));
-assert(![...bBuildings?.[1]?.classList]?.includes('bb1'));
+assert.isTrue(![...bBuildings?.[0]?.classList]?.includes('bb1'));
+assert.isTrue(![...bBuildings?.[1]?.classList]?.includes('bb1'));
 ```
 
 You should add one new `div` element between the `.bb3` and `.bb4` element.
 
 ```js
-assert(document.querySelector('.bb3')?.nextElementSibling === document.querySelector('.bb4')?.previousElementSibling);
+assert.equal(document.querySelector('.bb3')?.nextElementSibling, document.querySelector('.bb4')?.previousElementSibling);
 ```
 
 You should add two new `div` elements after the `.bb4` element.
@@ -36,7 +36,7 @@ assert.exists(bb4?.nextElementSibling?.nextElementSibling);
 You should add 5 new `div` elements.
 
 ```js
-assert.equal(document.querySelectorAll('div')?.length, 14);
+assert.lengthOf(document.querySelectorAll('div'), 14);
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98e4.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98e4.md
index 7aeec907b27..b333903e42d 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98e4.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98e4.md
@@ -14,7 +14,7 @@ The background buildings are starting to look pretty good. Create a new `div` be
 You should create a new `div` element.
 
 ```js
-assert.equal(document.querySelectorAll('div')?.length, 15);
+assert.lengthOf(document.querySelectorAll('div'), 15);
 ```
 
 The new `div` should come after the `div.background-buildings` element.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98e6.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98e6.md
index dc1a0644b00..7350b10a04e 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98e6.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98e6.md
@@ -64,7 +64,7 @@ You should place the new `div` elements in the correct order.
 function __t(a, b) {
   return [...document.querySelector(a)?.nextElementSibling?.classList]?.includes(b);
 }
-assert(__t('div.fb1','fb2') && __t('div.fb2','fb3') && __t('div.fb3','fb4') && __t('div.fb4', 'fb5') && __t('div.fb5', 'fb6'));
+assert.isTrue(__t('div.fb1','fb2') && __t('div.fb2','fb3') && __t('div.fb3','fb4') && __t('div.fb4', 'fb5') && __t('div.fb5', 'fb6'));
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ec.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ec.md
index e8127da9f38..78eb9d7d153 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ec.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ec.md
@@ -15,14 +15,14 @@ You should add two `div` elements as the first children of `.foreground-building
 
 ```js
 const bBuildings = document.querySelector('.background-buildings')?.children;
-assert(![...bBuildings?.[0]?.classList]?.includes('fb1'));
-assert(![...bBuildings?.[1]?.classList]?.includes('fb1'));
+assert.isTrue(![...bBuildings?.[0]?.classList]?.includes('fb1'));
+assert.isTrue(![...bBuildings?.[1]?.classList]?.includes('fb1'));
 ```
 
 You should add one `div` element between `.fb2` and `.fb3`.
 
 ```js
-assert(document.querySelector('.fb2')?.nextElementSibling === document.querySelector('.fb3')?.previousElementSibling);
+assert.equal(document.querySelector('.fb2')?.nextElementSibling, document.querySelector('.fb3')?.previousElementSibling);
 ```
 
 
@@ -37,7 +37,7 @@ assert.exists(fb6?.nextElementSibling?.nextElementSibling);
 You should have added 5 new `div` elements.
 
 ```js
-assert.equal(document.querySelectorAll('div')?.length, 26);
+assert.lengthOf(document.querySelectorAll('div'), 26);
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ee.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ee.md
index 5f33304cd72..80bb1354128 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ee.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ee.md
@@ -14,13 +14,13 @@ Your code is starting to get quite long. Add a comment above the `.fb1` class th
 You should add the comment `BACKGROUND BUILDINGS - "bb" stands for "background building"` above the `.bb1` selector.
 
 ```js
-assert(/\/\*\s*BACKGROUND BUILDINGS - "bb" stands for "background building"\s*\*\//gi.test(code));
+assert.match(code, /\/\*\s*BACKGROUND BUILDINGS - "bb" stands for "background building"\s*\*\//gi);
 ```
 
 You should add the comment `FOREGROUND BUILDINGS - "fb" stands for "foreground building"` above the `.fb1` selector.
 
 ```js
-assert(/\/\*\s*FOREGROUND BUILDINGS - "fb" stands for "foreground building"\s*\*\//gi.test(code));
+assert.match(code, /\/\*\s*FOREGROUND BUILDINGS - "fb" stands for "foreground building"\s*\*\//gi);
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ef.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ef.md
index 77e1a4588ca..f25fed15e91 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ef.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98ef.md
@@ -14,7 +14,7 @@ Create a new variable in `:root` called `--window-color1` and give it a value of
 You should create a new variable in `:root` called `--window-color1`.
 
 ```js
-assert(new __helpers.CSSHelp(document).isPropertyUsed('--window-color1'));
+assert.exists(new __helpers.CSSHelp(document).isPropertyUsed('--window-color1'));
 ```
 
 You should give the property variable `--window-color1` a value of `black`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98f0.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98f0.md
index 45e8ff6334f..5418a4d5c2e 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98f0.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98f0.md
@@ -23,7 +23,7 @@ In the example, `color1` is solid at the top, `color2` is solid at the bottom, a
 You should apply a `background` to `.bb1a` right after the `background-color`.
 
 ```js
-assert(new __helpers.CSSHelp(document).getStyle('.bb1a')?.background);
+assert.exists(new __helpers.CSSHelp(document).getStyle('.bb1a')?.background);
 ```
 
 You should give the `background` a `linear-gradient`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98f8.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98f8.md
index 1ed735b2301..439a26e8c63 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98f8.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e98f8.md
@@ -14,7 +14,7 @@ Nest two new `div` elements within `.bb2`, give them the classes of `bb2a` and `
 You should add two `div` elements to `.bb2`.
 
 ```js
-assert.equal(document.querySelector('div.bb2')?.children?.length, 2);
+assert.lengthOf(document.querySelector('div.bb2')?.children, 2);
 ```
 
 You should give the first `div` a class of `bb2a`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9903.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9903.md
index 9ad8785db13..16da76d16c1 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9903.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9903.md
@@ -14,7 +14,7 @@ On to the next building! Create a new variable called `--window-color3` in `:roo
 You should define a new property variable `--window-color3`.
 
 ```js
-assert(new __helpers.CSSHelp(document).isPropertyUsed("--window-color3"));
+assert.exists(new __helpers.CSSHelp(document).isPropertyUsed("--window-color3"));
 ```
 
 You should give `--window-color3` a value of `#d98cb3`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e990c.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e990c.md
index b5f75a8842f..257a89eda2a 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e990c.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e990c.md
@@ -14,7 +14,7 @@ Create a new variable called `--window-color4` in `:root` and give it a value of
 You should define a new property variable `--window-color4`.
 
 ```js
-assert(new __helpers.CSSHelp(document).isPropertyUsed("--window-color4"));
+assert.exists(new __helpers.CSSHelp(document).isPropertyUsed("--window-color4"));
 ```
 
 You should give `--window-color4` a value of `#8cb3d9`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e990d.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e990d.md
index c01cf0cb027..6dca787bd09 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e990d.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e990d.md
@@ -14,13 +14,13 @@ Nest four new `div` elements within `.bb4c`, give them all the class of `bb4-win
 You should add four `div` elements to `.bb4c`.
 
 ```js
-assert.equal(document.querySelector(".bb4c")?.children?.length, 4);
+assert.lengthOf(document.querySelector(".bb4c")?.children, 4);
 ```
 
 You should give each new `div` a class of `bb4-window`.
 
 ```js
-assert.equal(document.querySelectorAll("div.bb4c > div.bb4-window")?.length, 4);
+assert.lengthOf(document.querySelectorAll("div.bb4c > div.bb4-window"), 4);
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9911.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9911.md
index 3be5bc18eb6..f5022805679 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9911.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9911.md
@@ -14,7 +14,7 @@ Looks good! On to the foreground buildings! Turn the `.fb1` building into three
 You should add three `div` elements within `.fb1`.
 
 ```js
-assert.equal(document.querySelector("div.fb1")?.children?.length, 3);
+assert.lengthOf(document.querySelector("div.fb1")?.children, 3);
 ```
 
 You should give the first new `div` a class of `fb1a`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e991a.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e991a.md
index c1434615d38..8e42b2c6df9 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e991a.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e991a.md
@@ -14,14 +14,14 @@ On to the next building! Nest two `div` elements within `.fb2` and give them cla
 You should add two `div` elements within `.fb2`.
 
 ```js
-assert.equal(document.querySelectorAll("div.fb2 > div")?.length, 2);
+assert.lengthOf(document.querySelectorAll("div.fb2 > div"), 2);
 ```
 
 You should give the first new `div` a class of `fb2a`.
 
 ```js
 assert.exists(document.querySelector("div.fb2 > div.fb2a"));
-assert(document.querySelector("div.fb2 > div.fb2a") === document.querySelector("div.fb2")?.firstElementChild);
+assert.equal(document.querySelector("div.fb2 > div.fb2a"), document.querySelector("div.fb2")?.firstElementChild);
 ```
 
 You should give the second new `div` a class of `fb2b`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e991c.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e991c.md
index 428497c9409..cd40ec7ea04 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e991c.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e991c.md
@@ -14,13 +14,13 @@ Nest three `div` elements within `.fb2b` and give them a class of `fb2-window`.
 You should add three `div` elements within `.fb2b`.
 
 ```js
-assert.equal(document.querySelectorAll("div.fb2b > div")?.length, 3);
+assert.lengthOf(document.querySelectorAll("div.fb2b > div"), 3);
 ```
 
 You should give the three new `div` elements each a class of `fb2-window`.
 
 ```js
-assert.equal(document.querySelectorAll("div.fb2-window")?.length, 3);
+assert.lengthOf(document.querySelectorAll("div.fb2-window"), 3);
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9921.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9921.md
index 4eccae5a1aa..90f11a652b0 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9921.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9921.md
@@ -14,7 +14,7 @@ For the next building, nest four `div` elements within `.fb3` with classes of `f
 You should add four `div` elements within `.fb3`.
 
 ```js
-assert.equal(document.querySelectorAll("div.fb3 > div")?.length, 4);
+assert.lengthOf(document.querySelectorAll("div.fb3 > div"), 4);
 ```
 
 You should give the first new `div` a class of `fb3a`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9925.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9925.md
index a3a0d9b75dd..1205457aed7 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9925.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9925.md
@@ -14,13 +14,13 @@ Nest three new `div` elements in the first `.fb3a` element. Give them each a cla
 You should add three `div` elements within the first `.fb3a` element.
 
 ```js
-assert.equal(document.querySelectorAll("div.fb3a > div")?.length, 3);
+assert.lengthOf(document.querySelectorAll("div.fb3a > div"), 3);
 ```
 
 You should give each new `div` a class of `fb3-window`.
 
 ```js
-assert.equal(document.querySelectorAll("div.fb3-window")?.length, 3)
+assert.lengthOf(document.querySelectorAll("div.fb3-window"), 3)
 ```
 
 # --seed--
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9929.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9929.md
index 049f74e8455..4a712805272 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9929.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e9929.md
@@ -14,7 +14,7 @@ Only three more buildings to go. Nest two new `div` elements within the `.fb4` e
 You should add two `div` elements within `.fb4`.
 
 ```js
-assert.equal(document.querySelectorAll("div.fb4 > div")?.length, 2);
+assert.lengthOf(document.querySelectorAll("div.fb4 > div"), 2);
 ```
 
 You should give the first new `div` a class of `fb4a`.
diff --git a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e992c.md b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e992c.md
index e5b5c10e4da..a4b1f3c1e03 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e992c.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-city-skyline/5d822fd413a79914d39e992c.md
@@ -14,13 +14,13 @@ Nest six `div` elements within `.fb4b` and give them all a class of `fb4-window`
 You should add six `div` elements within `.fb4b`.
 
 ```js
-assert.equal(document.querySelectorAll("div.fb4b > div")?.length, 6);
+assert.lengthOf(document.querySelectorAll("div.fb4b > div"), 6);
 ```
 
 You should give each new `div` a class of `fb4-window`.
 
 ```js
-assert.equal(document.querySelectorAll("div.fb4-window")?.length, 6);
+assert.lengthOf(document.querySelectorAll("div.fb4-window"), 6);
 ```
 
 # --seed--