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Basics

How it works

You will have to get through all the exercises in the right order, so:

  • 01-basic-data-types
  • 02-composite-types
  • 03-functions/01-simple
  • 03-functions/02-recursion
  • etc...

An exercise is considered to be done when all the associated tests successfully pass. To do that, each exercise package contains an src.go file on which you will have to apply the necessary changes. In the exercise folder, use this command to run all the tests:

$ go test

For some exercises, first the code will not even compile. That being said, it is recommended to run them anyway because output errors might give useful hints about how to solve the exercise. For example, the first exercise 01-basic-data-types will output:

$ go test
# github.com/aubm/golang-codelab/exercises/basics/01-basic-data-types
./src.go:4: missing return at end of function
./src.go:7: missing return at end of function
./src.go:10: missing return at end of function
./src.go:13: missing return at end of function
./src.go:16: missing return at end of function
./src.go:19: missing return at end of function
./src.go:22: missing return at end of function
./src.go:25: undefined: who
FAIL	github.com/aubm/golang-codelab/exercises/basics/01-basic-data-types [build failed]

At some point the code will successfully compile, then you will have to apply the appropriate changes to the code, so that the tests exit without errors.

Here is an example output when the code successfully compiles, but the tests are not ok:

$ go test
--- FAIL: TestMustReturnTheSum (0.00s)
	src_test.go:27: when a=0 and b=0, expected 0, got 3
	src_test.go:27: when a=1 and b=0, expected 1, got 3
	src_test.go:27: when a=3 and b=3, expected 6, got 3
	src_test.go:27: when a=3 and b=4, expected 7, got 3
FAIL
exit status 1
FAIL	github.com/aubm/golang-codelab/solutions/basics/01-basic-data-types	0.012s

When the job is done, you should see something like that:

$ go test
PASS
ok  	github.com/aubm/golang-codelab/solutions/basics/01-basic-data-types	0.009s

The tests output will give you useful hints, but reading the yet-to-be completed-exercise source code in the src.go file should give you enough information to get started.

For each exercise, some recommended readings are given, you might want to take a look at them if you want to get a better understanding on the aspects of the language that the exercise addresses.

Solutions

If you really need to, you can take a look at possible solutions for each exercise. Solutions are given in $GOPATH/src/github.com/aubm/golang-codelab/solutions/basics.

Readings

01: Basic data types

02: Composite types

03: Functions

04: Methods

05: Interfaces

06: Concurrency

What after it?

You completed the basics when this command successfully passes:

$ go test github.com/aubm/golang-codelab/exercises/basics/...
ok  	github.com/aubm/golang-codelab/exercises/basics/01-basic-data-types	0.015s
ok  	github.com/aubm/golang-codelab/exercises/basics/02-composite-types	0.017s
ok  	github.com/aubm/golang-codelab/exercises/basics/03-functions/01-simple	0.015s
ok  	github.com/aubm/golang-codelab/exercises/basics/03-functions/02-recursion	0.017s
ok  	github.com/aubm/golang-codelab/exercises/basics/03-functions/03-multiple-return-values	0.013s
ok  	github.com/aubm/golang-codelab/exercises/basics/03-functions/04-error-handling	0.030s
ok  	github.com/aubm/golang-codelab/exercises/basics/03-functions/05-variadic-functions	0.018s
ok  	github.com/aubm/golang-codelab/exercises/basics/03-functions/06-deferred-function-calls	0.015s
ok  	github.com/aubm/golang-codelab/exercises/basics/03-functions/07-pointers	0.014s
ok  	github.com/aubm/golang-codelab/exercises/basics/04-methods/01-declarations	0.013s
ok  	github.com/aubm/golang-codelab/exercises/basics/04-methods/02-pointer-receiver	0.012s
ok  	github.com/aubm/golang-codelab/exercises/basics/04-methods/03-encapsulation	0.019s
ok  	github.com/aubm/golang-codelab/exercises/basics/05-interfaces/01-interface-types	0.018s
ok  	github.com/aubm/golang-codelab/exercises/basics/05-interfaces/02-anonymous-interfaces	0.020s
ok  	github.com/aubm/golang-codelab/exercises/basics/05-interfaces/03-discriminating-errors	0.015s
ok  	github.com/aubm/golang-codelab/exercises/basics/06-concurrency/01-goroutines	1.013s
ok  	github.com/aubm/golang-codelab/exercises/basics/06-concurrency/02-multiplexing-with-select	4.022s
ok  	github.com/aubm/golang-codelab/exercises/basics/06-concurrency/03-cancellation	9.024s
ok  	github.com/aubm/golang-codelab/exercises/basics/06-concurrency/04-races	2.523s

Go back to the home page of this repository and follow the link to get started with writing your firsts real Go programs.