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Initializing Arrays

Part of the Fundamentals section of Coddy's GO journey. Lesson 69 of 109.

Initializing Arrays means setting initial values when creating an array.

Initialize an array with specific values using curly braces:

scores := [4]int{95, 87, 78, 92}
fmt.Println(scores)

This displays:

[95 87 78 92]

Use the ellipsis (...) to let Go count the elements for you:

colors := [...]string{"Red", "Green", "Blue"}
fmt.Println(colors)
fmt.Println("Array length:", len(colors))

This outputs:

[Red Green Blue]
Array length: 3

Challenge

Beginner

In this challenge, you'll practice initializing arrays in Go. Your task is to create an array of 5 integers with the specific values provided, then print the array.

The code already has the necessary imports and a main function. You just need to initialize the array with the given numbers.

Try it yourself

package main

import "fmt"

func main() {
    // TODO: Initialize an array called 'favoriteNumbers' with these 5 integers: 7, 42, 8, 13, 99
    // You can use either syntax:
    // favoriteNumbers := [5]int{7, 42, 8, 13, 99}
    // OR
    // var favoriteNumbers [5]int = [5]int{7, 42, 8, 13, 99}
    
    // This will print your array
    fmt.Printf("My favorite numbers are: %v\n", favoriteNumbers)
}

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 Arrays Declaring ArraysInitializing ArraysAccessing 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

Practice on your own: Online Go compiler