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Declaring Arrays

Part of the Fundamentals section of Coddy's GO journey — lesson 68 of 109.

In Go, you can declare arrays in several ways. An array's size is part of its type and must be specified when declared.

Declare an array using var with a specific size:

var scores [4]int
fmt.Println(scores)

This creates an array of 4 integers, all initialized to zero:

[0 0 0 0]

Declare and initialize an array in one line using shorthand notation:

names := [3]string{"Alice", "Bob", "Charlie"}
fmt.Println(names)

This displays:

[Alice Bob Charlie]

Challenge

Beginner

In this challenge, you'll practice declaring and initializing an array in Go. Your task is to declare an array of 5 integers with the values 10, 20, 30, 40, and 50, then print the array to the console.

Cheat sheet

Arrays in Go have a fixed size that must be specified when declared. The size is part of the array's type.

Declare an array with var:

var scores [4]int

Declare and initialize an array using shorthand notation:

names := [3]string{"Alice", "Bob", "Charlie"}

Arrays are initialized to zero values if not explicitly set:

[0 0 0 0]

Try it yourself

package main

import "fmt"

func main() {
    // TODO: Declare an array named 'numbers' that contains 5 integers: 10, 20, 30, 40, and 50
    
    // This will print your array
    fmt.Println("My array of numbers:", numbers)
}

Test yourself

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

All lessons in Fundamentals

1Introduction to Go

What is Go?Hello World Println Go Comments

4Comparison & Logical Operators

Comparison Operators - Part 1 Comparison Operators - Part 2 Logical AND Operator Logical OR Operator Logical NOT Operator Operator Precedence Basics Recap - Making Comparisons

7Control Flow: Loops

What The `for` Loop Explained For Loop - Basic For Loop - Condition Only The `break` Keyword The `continue` Keyword Nested Loops Recap - Repeating Actions

10Composite Types: Arrays

Introduction to ArraysDeclaring ArraysInitializing Arrays Accessing Array Elements Array Length with `len`Iterating Over Arrays Multi-dimensional Arrays

13Composite Types: Structs

Defining Custom Types Creating Struct Instances Accessing Struct Fields Pointers to Structs Initializing Structs Embedded Structs Anonymous Structs Recap - Custom Data Structures

2Variables and Basic Data Types

What is a variable Type Inference with `:=`Integers (int)Floating-Point Numbers Booleans Strings Zero Values Constants Naming Conventions Recap - Variables and Types

5Basic Input/Output

Formatted Output Format Verbs Printing Types Getting Basic User Input Recap - Input and Output

8Functions

Understanding Functions Declaring a Function Calling Functions Function Parameters Returning a Single Value Returning Multiple Values Named Return Values Function Scope Basics Recap - Creating Reusable Code

11Composite Types: Slices

Introduction to Slices Declaring Slice Literals Creating Slices with `make`Slice Length vs Capacity Accessing Slice Elements Appending Elements Slicing Existing Slices/Arrays Iterating Over Slices Copying Slices Recap - Dynamic Lists

14Basic Error Handling

The Concept of Errors The `error` Interface Functions Returning Errors Checking for Errors Creating Simple Errors Creating Formatted Errors Basic Error Handling Recap - Handling Problems