Takeaways & Points to Revise

These are the key takeaways and point to revise/reiterate of the learning from Go Tutorial.

Packages

fmt --> String format
- Sprintf --> Parse string with variables
- Println --> Print to console
log --> Print console logs
- SetPrefix --> set prefix for log messages
- SetFlags --> Timestamps?
errors --> Generate error messages + ?
- New --> create new error with a message
math/rand --> Generate random numbers?
time --> Time operations like Now()
testing --> Builtin testing package
- *testing.T pointer
regexp -->
- want how is this used?
- MustCompile()
- Back ticks - purpose?
- MatchString() -- Check if a string that matches regex is found in the argument passed

Tips

1. Short Declaration

:= can be used to declare and assign a variable

2. nil

Can be used to validate if a variable is empty?

3. Slices -- Arrays --> Check

Declaration:

[]string{
        "item1",
        "item2",
        "item3",
}

Note: Comma after last item in array

4. init function

init is called after all the variable declarations in the package have evaluated their initializers, and those are evaluated only after all the imported packages have been initialized.

func init() {
    if user == "" {
        log.Fatal("$USER not set")
    }
    if home == "" {
        home = "/home/" + user
    }
    if gopath == "" {
        gopath = home + "/go"
    }
    // gopath may be overridden by --gopath flag on command line.
    flag.StringVar(&gopath, "gopath", gopath, "override default GOPATH")
}

for Loop --> refer effective go _ blank identifier range of slices or maps use make() to initialize map/slice/chan
Test Cases should cover both corerct values and incorrect values
- It should expect errors are also handled properly, meaning a test case should include test functions to check if the errors are returned properly.
- For a the test case for the wrong argument, if the function does not return proper error, it means the function does not handle the error and the test case failed.

r0B-O / go-beginner