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update first part of tutorial for REPL experience

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Luke Boswell 2023-11-20 20:28:20 +11:00
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@ -37,13 +37,20 @@
## [REPL](#repl) {#repl}
Let's start by getting acquainted with Roc's [_Read-Eval-Print-Loop_](https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop), or **REPL** for short. Run this in a terminal:
Let's start by getting acquainted with Roc's [_Read-Eval-Print-Loop_](https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop), or **REPL** for short.
<code class="block">roc repl</code>
You can use the online REPL at [roc-lang.org/repl](https://www.roc-lang.org/repl).
If Roc is [installed](/wip/install.html), you should see this:
Or you can run this in a terminal: <code class="block">roc repl</code>, and if Roc is [installed](/wip/install.html), you should see this:
<pre><samp>The rockin' roc repl</samp></pre>
<pre>
<samp>
The rockin’ roc repl
────────────────────────
Enter an expression, or :help, or :q to quit.
</samp></pre>
So far, so good!
@ -63,16 +70,12 @@ Congratulations! You've just written your first Roc code.
When you entered the _expression_ `"Hello, World!"`, the REPL printed it back out. It also printed `: Str`, because `Str` is that expression's type. We'll talk about types later; for now, let's ignore the `:` and whatever comes after it whenever we see them.
Let's try that out. Put this into the repl and press Enter:
You can assign specific names to expressions. Try entering these lines:
<pre><samp class="repl-prompt">val1</samp></pre>
You should see the same `"Hello, World!"` line as before.
You can also assign specific names to expressions. Try entering these lines:
<pre><samp class="repl-prompt">greeting = <span class="literal">"Hi"</span></samp></pre>
<pre><samp class="repl-prompt">audience = <span class="literal">"World"</span></samp></pre>
```
greeting = "Hi"
audience = "World"
```
From now until you exit the REPL, you can refer to either `greeting` or `audience` by those names! We'll use these later on in the tutorial.
@ -84,7 +87,7 @@ Now let's try using an _operator_, specifically the `+` operator. Enter this:
You should see this output:
<pre><samp>2 <span class="colon">:</span> Num * <span class="comment"> # val2</span></samp></pre>
<pre><samp>2 <span class="colon">:</span> Num * <span class="comment"></span></samp></pre>
According to the REPL, one plus one equals two. Sounds right!