An introduction to writing Go

Lesson 1 · On the house

Package main and fmt.Println

The smallest Go program that talks back.

Lesson 2

Variables, short declare, and types

var, :=, and basic types.

Lesson 3

Strings and runes

UTF-8 strings; len is bytes.

Lesson 4

If, else, and comparisons

Branches without parentheses.

Lesson 5

For loops — the only loop

for covers while, classic, and range.

Lesson 6

Slices

Dynamic views over arrays.

Lesson 7

Maps

Key-value tables.

Lesson 8

Structs and methods

Named fields; methods with receivers.

Lesson 9

Functions and multiple returns

Named params; (T, error) idiom.

Lesson 10

A small Go program

Compose package, vars, slice, and a function.