Go R1 Day 55

2021-07-19 258 words 2 minutes

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In Go, when you call a function or a method the arguments are copied. ¹

Built some test cases for working with pointers and test methods.
Did this in Goland to become more familar with it and figured out how to use the nice tests explorer with a floating window to auto-test.
Built a filewatcher configuration watcher as alternative to tests panel, allowing automated run in terminal or output panel of go test ./....
Couldn’t figure out how to run every test in project, as it’s a multi-module repo (for tutorials). VSCode works fine with this with the multi-module support.

These pointers to structs even have their own name: struct pointers and they are automatically dereferenced. ¹

This explains something that felt a little confusing as a new Gopher. Now I know why returning a value back as an int didn’t require explicit dereferencing. ²

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func (w *Wallet) Balance() int {
  return w.balance // <---- automatically deferenced
}

Not clear yet on if I need to set the is := New(t) in the context of each t.Run() or not.

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t.Run("withdraw 2 amounts", func(t *testing.T) {
		wallet := pointers.Wallet{}
		wallet.Deposit(pointers.Bitcoin(20))
		err := wallet.Withdraw(pointers.Bitcoin(5))
		is.NoErr(err) // Withdraw should have no errors
		assertBalance(t, &wallet, pointers.Bitcoin(15))
	})

Go R1 Day 55

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