Explore fun brain teasers to hone your logic, critical thinking, and problem-solving skills. Gain insights into Go and practice to avoid future mistakes.

go.tar.gz

Go lang

Who knew puzzles could be fun? Puzzles and brain teasers are a great way to practice your critical thinking and improve your logic and problem-solving skills. This course provides a basic understanding of Go. The teasers in this course will help you practice what you already know and help avoid future mistakes.

Go Brain Teasers

# Try it yourself ##
Try executing the code below to see the result for yourself.

package main

import (
	"fmt"
)

func main() {
	var m map[string]int
	fmt.Println(m["Hello"])
}




# Explanation ##
The zero value for an uninitialized map is `nil`. Some operations on Go’s map
type is `nil` safe, meaning they will work with a `nil` map without panicking.

Both `len` and accessing a value (for example, `m["Hello"]`) will work on a `nil` map. The `len` function returns `0` and access  to a value with  a key that does the following:

* If the key is on the map, return its value.
* If the key is not on the map, return the zero value for the value type.

In this example, the key **"Hello"** is not found on the map and you’ll get back
the zero value for `int`, which is `0`.

That’s a practical thing to do. If you want to count items (say, word frequency in
a document), you can do `m[word]++` without worrying if the word is in the map `m`
or not.

This leads to a question: How do we know if the value we got from a map is there or if it’s the zero value of value type? The answer is to use the comma (`,ok`) paradigm.



Understand why you can get nil as your output. 

Puzzle 2 Explanation: Map Type

Understand why you can get nil as your output.

Before We Begin

Puzzles

Wrapping Up

Puzzle 2 Explanation: Map Type

Try it yourself

Explanation