diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/@@iterator/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/@@iterator/index.md
index bc2077158577c72..f47b6a59fe141a4 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/@@iterator/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/@@iterator/index.md
@@ -37,7 +37,7 @@ The array **iterator** function, which is the
 const arr = new Uint8Array([10, 20, 30, 40, 50]);
 // your browser must support for..of loop
 // and let-scoped variables in for loops
-for (let n of arr) {
+for (const n of arr) {
   console.log(n);
 }
 ```
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/indexof/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/indexof/index.md
index 75b1f2360ccac06..7fd8ce8ea9df84e 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/indexof/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/indexof/index.md
@@ -49,14 +49,14 @@ The first index of the element in the array; `-1` if not found.
 `indexOf` compares `searchElement` to elements of the
 typed array using
 [strict equality](/en-US/docs/Web/JavaScript/Reference/Operators#using_the_equality_operators)
-(the same method used by the ===, or triple-equals, operator).
+(the same method used by the `===`, or triple-equals, operator).
 
 ## Examples
 
 ### Using indexOf
 
 ```js
-var uint8 = new Uint8Array([2, 5, 9]);
+const uint8 = new Uint8Array([2, 5, 9]);
 uint8.indexOf(2);     // 0
 uint8.indexOf(7);     // -1
 uint8.indexOf(9, 2);  // 2
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/join/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/join/index.md
index 9d73fd8a78f4d3f..4bf09d4f3e1f6d3 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/join/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/join/index.md
@@ -43,7 +43,7 @@ A string with all array elements joined.
 ### Using join()
 
 ```js
-var uint8 = new Uint8Array([1,2,3]);
+const uint8 = new Uint8Array([1,2,3]);
 uint8.join();      // '1,2,3'
 uint8.join(' / '); // '1 / 2 / 3'
 uint8.join('');    // '123'
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/keys/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/keys/index.md
index 5f0b07765c2ac9e..2b94e079df72d8d 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/keys/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/keys/index.md
@@ -35,11 +35,11 @@ A new _array iterator_ object.
 ### Iteration using for...of loop
 
 ```js
-var arr = new Uint8Array([10, 20, 30, 40, 50]);
-var eArray = arr.keys();
+const arr = new Uint8Array([10, 20, 30, 40, 50]);
+const eArray = arr.keys();
 // your browser must support for..of loop
 // and let-scoped variables in for loops
-for (let n of eArray) {
+for (const n of eArray) {
   console.log(n);
 }
 ```
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/lastindexof/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/lastindexof/index.md
index ddb3643dc57ba26..45e4eacc08c4577 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/lastindexof/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/lastindexof/index.md
@@ -56,7 +56,7 @@ The last index of the element in the array; `-1` if not found.
 ### Using lastIndexOf
 
 ```js
-var uint8 = new Uint8Array([2, 5, 9, 2]);
+const uint8 = new Uint8Array([2, 5, 9, 2]);
 uint8.lastIndexOf(2);     // 3
 uint8.lastIndexOf(7);     // -1
 uint8.lastIndexOf(2, 3);  // 3
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/length/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/length/index.md
index 32fbbde6e700be2..f514a7718054c96 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/length/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/length/index.md
@@ -24,15 +24,15 @@ The `length` property is an accessor property whose set accessor function is `un
 ### Using the `length` property
 
 ```js
-var buffer = new ArrayBuffer(8);
+const buffer = new ArrayBuffer(8);
 
-var uint8 = new Uint8Array(buffer);
+let uint8 = new Uint8Array(buffer);
 uint8.length; // 8 (matches the length of the buffer)
 
-var uint8 = new Uint8Array(buffer, 1, 5);
+uint8 = new Uint8Array(buffer, 1, 5);
 uint8.length; // 5 (as specified when constructing the Uint8Array)
 
-var uint8 = new Uint8Array(buffer, 2);
+uint8 = new Uint8Array(buffer, 2);
 uint8.length; // 6 (due to the offset of the constructed Uint8Array)
 ```
 
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/reduce/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/reduce/index.md
index f2afb531cfd5896..36f0db09a626812 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/reduce/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/reduce/index.md
@@ -96,7 +96,7 @@ value would be returned without calling `callbackFn`.
 ### Sum up all values within an array
 
 ```js
-var total = new Uint8Array([0, 1, 2, 3]).reduce(function(a, b) {
+const total = new Uint8Array([0, 1, 2, 3]).reduce(function(a, b) {
   return a + b;
 });
 // total == 6
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/reduceright/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/reduceright/index.md
index cf29b79f9894fb4..755b42b2e101d93 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/reduceright/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/reduceright/index.md
@@ -100,7 +100,7 @@ value would be returned without calling `callbackFn`.
 ### Sum up all values within an array
 
 ```js
-var total = new Uint8Array([0, 1, 2, 3]).reduceRight(function(a, b) {
+const total = new Uint8Array([0, 1, 2, 3]).reduceRight(function(a, b) {
   return a + b;
 });
 // total == 6
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/reverse/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/reverse/index.md
index eb0b5a4ce2b2b34..7e7419d740bf8fd 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/reverse/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/reverse/index.md
@@ -35,7 +35,7 @@ The reversed array.
 ### Using reverse
 
 ```js
-var uint8 = new Uint8Array([1, 2, 3]);
+const uint8 = new Uint8Array([1, 2, 3]);
 uint8.reverse();
 
 console.log(uint8); // Uint8Array [3, 2, 1]
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/set/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/set/index.md
index f82e9b0a9a21928..2f59cfad1bfb13d 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/set/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/set/index.md
@@ -52,8 +52,8 @@ beyond the end of the typed array.
 ### Using set()
 
 ```js
-var buffer = new ArrayBuffer(8);
-var uint8 = new Uint8Array(buffer);
+const buffer = new ArrayBuffer(8);
+const uint8 = new Uint8Array(buffer);
 
 uint8.set([1, 2, 3], 3);
 
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/subarray/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/subarray/index.md
index c794fd363bafe2a..b341b5ca46e39a7 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/subarray/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/subarray/index.md
@@ -58,13 +58,13 @@ object's contents will impact the original object and vice versa.
 ### Using the subarray() method
 
 ```js
-var buffer = new ArrayBuffer(8);
-var uint8 = new Uint8Array(buffer);
-uint8.set([1,2,3]);
+const buffer = new ArrayBuffer(8);
+const uint8 = new Uint8Array(buffer);
+uint8.set([1, 2, 3]);
 
 console.log(uint8); // Uint8Array [ 1, 2, 3, 0, 0, 0, 0, 0 ]
 
-var sub = uint8.subarray(0,4);
+const sub = uint8.subarray(0, 4);
 
 console.log(sub);   // Uint8Array [ 1, 2, 3, 0 ]
 ```
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/tolocalestring/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/tolocalestring/index.md
index 3c09185789c3573..0433fe99757590f 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/tolocalestring/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/tolocalestring/index.md
@@ -48,7 +48,7 @@ A string representing the elements of the typed array.
 ### Using toLocaleString
 
 ```js
-var uint = new Uint32Array([2000, 500, 8123, 12, 4212]);
+const uint = new Uint32Array([2000, 500, 8123, 12, 4212]);
 
 uint.toLocaleString();
 // if run in a de-DE locale
diff --git a/files/en-us/web/javascript/reference/global_objects/typedarray/tostring/index.md b/files/en-us/web/javascript/reference/global_objects/typedarray/tostring/index.md
index f28227064e5afc0..df43346f76dee05 100644
--- a/files/en-us/web/javascript/reference/global_objects/typedarray/tostring/index.md
+++ b/files/en-us/web/javascript/reference/global_objects/typedarray/tostring/index.md
@@ -37,7 +37,7 @@ separated by commas. For example, the following code creates a typed array and u
 `toString` to convert the array to a string.
 
 ```js
-var numbers = new Uint8Array([2, 5, 8, 1, 4])
+const numbers = new Uint8Array([2, 5, 8, 1, 4])
 numbers.toString(); // "2,5,8,1,4"
 ```
 
@@ -51,7 +51,7 @@ If a browser doesn't support the `TypedArray.prototype.toString()` method
 yet, JavaScript will call the `toString` method of {{jsxref("Object")}}:
 
 ```js
-var numbers = new Uint8Array([2, 5, 8, 1, 4])
+const numbers = new Uint8Array([2, 5, 8, 1, 4])
 numbers.toString(); // "[object Uint8Array]"
 ```