Finish the Day Two post
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---
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title: ""Learning Go: Day Two"
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title: "Learning Go: Day Two"
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date: 2024-05-02T08:00:00.0Z
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tags:
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- tech
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@ -27,8 +27,70 @@ Fairly straightforward, right?
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## Importing and running the code
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So, I can't just do `import "maths"`, because that doesn't seem to resolve. Instead, I have to refer to my entire module name, and then append the path to it:
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```go
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import "lewisdale.dev/learn-go/maths"
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```
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So now I should be able to use my imported module and call `maths.multiply`, right?
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```go
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func main() {
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fmt.Println(sayHello())
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num := maths.multiply(2, 5)
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fmt.Printf("2 * 5 = %d\n", num)
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}
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```
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```bash
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go run main.go
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> ./main.go:16:15: undefined: maths.multiply
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```
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## Wait, what?
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So, it turns out in Go, there's no explicit export keyword. Instead, if you want a function to be exported [you have to capitalise the first letter](https://go.dev/tour/basics/3). Lowercase functions are implicitly private.
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```go
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// maths.go
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package maths
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func Multiply(a, b int) int {
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return a * b
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}
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```
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And then we can do
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```go
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// main.go
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func main() {
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fmt.Println(sayHello())
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num := maths.Multiply(2, 5)
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fmt.Printf("2 * 5 = %d\n", num)
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}
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```
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As a useful extra, the Go plugin on VS Code[^2] even organised my imports into one `import ()` statement:
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```go
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// main.go
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package main
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import (
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"fmt"
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"lewisdale.dev/learn-go/maths"
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)
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```
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## The vendor directory
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[^1]: Yes, maths, not math
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When I was looking up how to create and import modules, I did find [this useful StackOverflow comment](https://stackoverflow.com/a/45813698) that mentions that Go > 1.5 has support for a `vendor` directory, that allows you to put code inside a `vendor` directory, and Go will lookup the package without requiring the local module prefix.
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I'm not going to use this, just because I'm probably going to reinvent the wheel a few times over the course of this series and I don't know the standard library well enough[^3] to trust myself to not accidentally tread all over it, but it's good to know it's there.
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[^1]: Yes, maths, not math
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[^2]: It was less helpful when it kept auto-deleting my import before I did the export though, had to use Vim just to make my point.
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[^3]: Or like, at all.
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@ -2,7 +2,7 @@
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--color-primary: var(--color-neutral-200);
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--color-secondary: var(--color-neutral-800);
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--color-decoration: var(--color-amber-200);
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--color-subtle: var(--color-zinc-400);
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--color-subtle: var(--color-neutral-300);
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--color-disabled: var(--color-neutral-400);
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--color-accent: var(--color-zinc-600);
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@ -60,7 +60,7 @@
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--color-primary: var(--color-neutral-200);
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--color-secondary: var(--color-neutral-800);
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--color-decoration: var(--color-amber-200);
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--color-subtle: var(--color-zinc-400);
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--color-subtle: var(--color-neutral-300);
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--color-disabled: var(--color-neutral-400);
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--color-accent: var(--color-zinc-400);
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--color-callout-bg: var(--color-slate-800);
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@ -71,7 +71,7 @@
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--color-primary: var(--color-neutral-200);
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--color-secondary: var(--color-neutral-800);
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--color-decoration: var(--color-amber-200);
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--color-subtle: var(--color-zinc-400);
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--color-subtle: var(--color-neutral-300);
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--color-disabled: var(--color-neutral-400);
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--color-accent: var(--color-zinc-600);
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--color-callout-bg: var(--color-slate-800);
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