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Introduction to Maps

Part of the Fundamentals section of Coddy's GO journey — lesson 84 of 109.

Maps in Go are key-value pairs, similar to dictionaries in other languages. They let you store and retrieve values using unique keys.

Create a map that associates string names with integer ages:

ages := map[string]int{
    "Alice": 25,
    "Bob": 30,
}

Access a value using its key:

aliceAge := ages["Alice"]
fmt.Println(aliceAge)

The output will be:

Add a new key-value pair:

ages["Charlie"] = 22

Cheat sheet

Maps in Go are key-value pairs that store and retrieve values using unique keys.

Create a map:

ages := map[string]int{
    "Alice": 25,
    "Bob": 30,
}

Access a value using its key:

aliceAge := ages["Alice"]

Add a new key-value pair:

ages["Charlie"] = 22

Try it yourself

This lesson doesn't include a code challenge.

Test yourself

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

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5Basic Input/Output

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8Functions

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11Composite Types: Slices

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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