chore(levels): improve comments

src/levels/1.ts

@@ -22,7 +22,7 @@ ${addText('Uncomment the exit')}
 `
 
 export const script = `
-// Single-line comments start with 2 forward slashes
+// A single-line comment starts with 2 forward slashes
 
 // console.log('This is commented out')
 console.log('This is not commented out')

src/levels/10.ts

@@ -30,7 +30,7 @@ ${addText('Update password & go to key')}
 
 export const script = `
 /**
- * Variables store data
+ * A variable stores data
  * 'const' cannot be reassigned, whereas 'let' can be reassigned
  */
 

src/levels/11.ts

@@ -32,7 +32,7 @@ ${addText('Repeat the password')}
 
 export const script = `
 /**
- * For loops repeat a block of code
+ * A for loop repeats a block of code
  */
 
 const key = get('key')[0]

src/levels/15.ts

@@ -31,7 +31,7 @@ ${addText('Exit in a loop')}
 
 export const script = `
 /**
- * setInterval() calls a function at specified intervals
+ * setInterval() calls a function at specified periods
  */
 
 const MILLISECOND = 1

src/levels/16.ts

@@ -61,7 +61,7 @@ onAdd('exit', () => {
 
 export const script = `
 /**
- * Can we speed this up?
+ * Can we speed things up?
  */
 
 const player = get('player')[0]

src/levels/4.ts

@@ -20,7 +20,7 @@ ${registerWinCondition(level)}
 
 export const script = `
 /**
- * Strings are text inside single or double quotes
+ * A string is text inside single or double quotes
  */
 
 const exit = 'exite'

src/levels/5.ts

@@ -23,7 +23,7 @@ ${addText('Exit is not in view?')}
 
 export const script = `
 /**
- * Numbers represent floating-point numbers like 42 or -13.37
+ * A number represents floating-point digits like 42 or -13.37
  */
 
 add([

src/levels/6.ts

@@ -23,7 +23,7 @@ ${addText('Exit is not truthy')}
 
 export const script = `
 /**
- * Booleans can either be true or false
+ * A boolean can either be true or false
  */
 
 if (false) {

src/levels/7.ts

@@ -33,7 +33,7 @@ onUpdate(() => {
 
 export const script = `
 /**
- * Arrays are an ordered list of data
+ * An array is an ordered list of data
  */
 
 const map = [
@@ -45,6 +45,8 @@ const map = [
   '#######',
 ]
 
+map[6] = map[0]
+
 add(['map', { map }])
 `
 

src/levels/8.ts

@@ -26,7 +26,7 @@ ${addText('Reposition me')}
 
 export const script = `
 /**
- * Objects are a collection of properties or key-value pairs
+ * An object is a collection of properties (key-value pairs)
  */
 
 const coordinates = {

src/levels/9.ts

@@ -26,7 +26,7 @@ ${addText('Move me')}
 
 export const script = `
 /**
- * Functions are blocks of code designed to perform a task
+ * A function is a block of code designed to perform a task
  */
 
 const player = get('player')[0]