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First Steps

Create a new module​

Shell command
go mod init MODULE_NAME
  • Go organizes code into modules.
  • Each module resides in a separate folder.
  • Each module must have a go.mod file.

Running tests​

Shell Command
go test
Shell Output
PASS
ok      calculator    0.683s

Variable assignment​

Variable assignment syntax
var VARIABLE_NAME DATA_TYPE = VALUE
Variable assignment sample
var discount float64 = 4.2

Formatting code​

  • Use gofmt
gofmt help
usage: gofmt [flags] [path ...]
  -cpuprofile string
        write cpu profile to this file
  -d    display diffs instead of rewriting files
  -e    report all errors (not just the first 10 on different lines)
  -l    list files whose formatting differs from gofmt's
  -r string
        rewrite rule (e.g., 'a[b:len(a)] -> a[b:]')
  -s    simplify code
  -w    write result to (source) file instead of stdout
List violations (diff)
gofmt -d FILENAME.go
tip

VSCode with the Go extension automatically reformats a Go file upon save