lua 5

Chapter 5 — Tables (🔥 Lua's Superpower)

If you master only one advanced feature in Lua, make it Tables.

Almost everything in Lua—game inventories, players, enemies, settings, maps, menus, JSON data—is built with tables.

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🎯 Mission

Imagine you own a backpack.

Without tables:

Sword
Shield
Potion
Apple
Bow
Arrow
Helmet
Gold

You'd need one variable for every item.

❌ Bad idea.

Instead:

inventory = {
    "Sword",
    "Shield",
    "Potion"
}

Now one variable (inventory) can hold many values.

Think of a table as a box with many compartments.

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🟢 LEVEL 1 — Survival

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Q1

What is a table mainly used for?

A) Storing many related values

B) Printing text

C) Repeating code

D) Making decisions

✅ Answer: A

💡 Tables let one variable hold lots of data.

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Q2

Which creates a table?

A)

inventory = {}

B)

inventory = ()

C)

inventory = []

D)

inventory = <>

✅ Answer: A

💡 Lua uses curly braces {}.

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Q3

inventory = {
    "Sword",
    "Shield",
    "Potion"
}

How many items are inside?

A) 1

B) 2

C) 3

D) 4

✅ Answer: C

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Q4

How do you access the first item?

A)

inventory[0]

B)

inventory[1]

C)

inventory.first

D)

inventory(1)

✅ Answer: B

💡 Lua starts counting from 1, not 0.

⚠️ This is one of the biggest beginner mistakes.

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Q5

inventory = {
    "Sword",
    "Shield"
}

print(inventory[2])

Output?

A)

Sword

B)

Shield

C)

2

D)

nil

✅ Answer: B

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Q6

inventory = {}

print(inventory[1])

Output?

A)

0

B)

Empty

C)

nil

D)

1

✅ Answer: C

💡 No item exists there yet.

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🟡 LEVEL 2 — Think Like a Programmer

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Q7

inventory = {
    "Sword",
    "Shield",
    "Potion"
}

print(inventory[3])

Output?

A)

Sword

B)

Shield

C)

Potion

D)

nil

✅ Answer: C

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Q8

inventory = {
    "Sword",
    "Shield"
}

inventory[2] = "Bow"

print(inventory[2])

Output?

A)

Shield

B)

Bow

C)

Sword

D)

nil

✅ Answer: B

💡 You replaced the second item.

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Q9

numbers = {
    10,
    20,
    30
}

print(numbers[1] + numbers[3])

Output?

A) 20

B) 30

C) 40

D) 50

✅ Answer: C

💡 10 + 30 = 40.

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Q10

pets = {
    "Dog",
    "Cat"
}

pets[3] = "Rabbit"

print(pets[3])

Output?

A)

Rabbit

B)

Cat

C)

Dog

D)

nil

✅ Answer: A

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Q11

scores = {
    50,
    80,
    90
}

scores[1] = scores[1] + 10

print(scores[1])

Output?

A) 50

B) 60

C) 80

D) 90

✅ Answer: B

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Q12

Which statement is true?

A) Tables can only store numbers.

B) Tables can only store strings.

C) Tables can store different data types together.

D) Tables store only one value.

✅ Answer: C

💡 Tables are flexible.

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🟠 LEVEL 3 — Real-Life Programming

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Q13

A player has 10 weapons.

Best choice?

A) 10 variables

B) One table

C) 10 functions

D) One loop

✅ Answer: B

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Q14

A class has 50 student names.

Best choice?

A) 50 variables

B) One table

C) 50 functions

D) 50 loops

✅ Answer: B

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Q15

Which is better?

A)

weapon1 = "Sword"
weapon2 = "Bow"
weapon3 = "Axe"

B)

weapons = {
    "Sword",
    "Bow",
    "Axe"
}

✅ Answer: B

💡 Cleaner, shorter, easier to manage.

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Q16

You're making a music playlist.

Best tool?

A) Boolean

B) Table

C) Function

D) if

✅ Answer: B

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Q17

A game inventory changes constantly.

Best tool?

A) Variable

B) Table

C) while

D) Boolean

✅ Answer: B

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Q18

A shopping cart stores many products.

Best choice?

A) Table

B) Function

C) Loop

D) if

✅ Answer: A

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🔴 LEVEL 4 — Bug Hunter

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Q19

inventory = []

What's wrong?

A) Lua doesn't use [] to create tables.

B) Missing if

C) Missing end

D) Nothing

✅ Answer: A

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Q20

inventory = {}

inventory[0] = "Sword"

print(inventory[1])

Output?

A)

Sword

B)

nil

C)

0

D) Error

✅ Answer: B

💡 Lua arrays normally start at 1, not 0.

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Q21

inventory = {
    "Sword"
}

print(inventory[2])

Output?

A)

Sword

B)

2

C)

nil

D) Error

✅ Answer: C

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Q22

inventory = {}

inventory[1] = "Sword"

inventory[1] = "Bow"

print(inventory[1])

Output?

A)

Sword

B)

Bow

C)

Sword Bow

D)

nil

✅ Answer: B

💡 The old value gets replaced.

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Q23

numbers = {
    5,
    10
}

print(numbers[1] * numbers[2])

Output?

A) 10

B) 15

C) 50

D) 5

✅ Answer: C

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Q24

Which is valid?

A)

player = {}

B)

player = []

C)

player = ()

D)

player = <>

✅ Answer: A

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🟣 LEVEL 5 — Boss Battle 👑

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Q25

What is the biggest advantage of tables?

A) Store many related values in one variable.

B) Replace loops.

C) Replace functions.

D) Replace if.

✅ Answer: A

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Q26

Lua tables usually start counting from...

A) 0

B) 1

C) -1

D) Depends on the computer

✅ Answer: B

⚠️ This is the #1 thing to remember about Lua tables.

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Q27

items = {
    "Apple",
    "Banana",
    "Orange"
}

print(items[2])

Output?

A)

Apple

B)

Banana

C)

Orange

D)

nil

✅ Answer: B

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Q28

Which real-life thing is most like a table?

A) A light switch

B) A backpack with many pockets

C) A calculator

D) A clock

✅ Answer: B

💡 One container holding many related things.

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Q29

Which is easier to manage?

A)

coin1
coin2
coin3
coin4
coin5

B)

coins = {
    10,
    20,
    30,
    40,
    50
}

✅ Answer: B

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Q30 — Final Boss

You're making an RPG game.

A player has:

• Name

• Level

• Health

• Mana

• Gold

• Inventory

• Quests

• Skills

What's your first thought?

A) Make 8 separate variables.

B) Put everything inside a table.

C) Use only functions.

D) Use only loops.

✅ Answer: B

💡 In real Lua projects, a player is almost always represented as a table because it groups all related information together.

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🧠 Pareto Cheat Sheet

Situation	Use
Create a table	{}
Get first item	table[1]
Change an item	table[2] = value
Empty table	{}
Missing item	nil
Lua starts counting at	1

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🏆 Boss Tip (The Most Important Thing in This Chapter)

So far you've learned:

• Variables → Store one value.

• Functions → Group many actions.

• Tables → Group many values.

That's a powerful mental model you'll keep using throughout Lua. In later chapters, you'll combine tables with loops and functions to build inventories, players, enemies, menus, and much more.