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String Concatenation

Part of the Fundamentals section of Coddy's Lua journey — lesson 15 of 90.

The string concatenation operator represented by two dots .. allows you to join two or more strings together to create a new, longer string.

Here's how string concatenation works:

firstName = "John"
lastName = "Smith"
fullName = firstName .. " " .. lastName    -- fullName is "John Smith"

greeting = "Hello, " .. "World!"          -- greeting is "Hello, World!"

Notice that concatenation doesn't automatically add spaces between strings - you need to include them explicitly. In the example above, we added " " between the first and last name to separate them with a space.

challenge icon

Challenge

Easy

Create a player's full name by combining their first name and last name using string concatenation. Create two variables: firstName with the value "Alex" and lastName with the value "Hunter". Use the concatenation operator to combine these strings with a space between them, storing the result in a variable called fullName. Print the full name.

Cheat sheet

The string concatenation operator .. joins two or more strings together:

firstName = "John"
lastName = "Smith"
fullName = firstName .. " " .. lastName    -- "John Smith"

greeting = "Hello, " .. "World!"          -- "Hello, World!"

Concatenation doesn't automatically add spaces - include them explicitly with " ".

Try it yourself

-- Create variables for first name and last name
-- TODO: Write your code here

-- Print the full name
print(fullName)
quiz iconTest yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

The LanguageHello World!Comments

4Operators 2 Relational & Logic

Equality OperatorsRelational OperatorsThe 'and' OperatorThe 'or' OperatorThe 'not' OperatorShort-Circuit EvaluationTruthy and Falsy ValuesRecap - Simple Logic

7Basic Conditional Logic

The if-then StatementThe if-then-else StatementThe elseif StatementRecap - Treasure Chest

10Tables Part 1: List-Style

What is a Table?Creating a TableAccessing Elements by IndexModifying Elements by IndexThe Length Operator '#'table.insert()table.remove()Recap - Manage Party Members

13Project: Simple Potion Shop

Project SetupAdding a PotionProject lessonDisplaying the InventoryProject lessonCalculating Total Stock ValueProject lessonFinding a Specific PotionProject lessonSelling a PotionProject lesson

2Variables and Data Types

What is a Variable?NumbersStringsBooleansThe Value 'nil'The type() FunctionNaming ConventionsRecap - Character Profile

5Basic Output

Printing LiteralsPrinting VariablesPrinting Multiple ValuesCombining Strings & VariablesThe tostring() FunctionInputCastRecap - Status ReportRecap - Till 120

8String Manipulation Basics

string.len()string.upper & string.lowerstring.sub()string.rep()string.find()Recap - Format Username

11Tables 2: Dictionary-Style

Key-Value PairsCreating Dictionary-Style TablAccessing - Bracket NotationAccessing with Dot NotationAdding and Modifying PairsRemoving Pairs with nilRecap - Item Properties

14Variable Scope

Global VariablesLocal VariablesWhy Use Local Variables?Scope and BlocksRecap - Scope Puzzle

3Operators 1 Arithmetic & Conc

Arithmetic OperatorsModulo OperatorExponentiation OperatorString ConcatenationOperator PrecedenceRecap - Simple Calculations

6Project: Character Stats Disp

Welcome MessageDeclare Character StatsProject lessonDisplay Basic StatsProject lessonAdd a Boolean FlagProject lessonFinal SummaryProject lesson

9Functions Basics

Declaring a FunctionCalling a FunctionFunctions with ParametersFunctions with Multiple ParamsThe 'return' StatementRecap - Area Calculator

12Loops Basics

The while LoopThe repeat-until LoopThe Numeric for Loopfor Loop with a StepThe 'break' StatementRecap - Countdown

15Final Challenges

Recap - Player TurnRecap - Simple DatabaseRecap - Sum of Even Numbers