Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

fix typo #104

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

fix typo #104

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion part1.html
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3216,7 +3216,7 @@ <h2 data-number="5.5" id="algebraic-datatypes-summary"><span class="header-secti
<p>This gives you accessor functions like <code>field1 :: TypeName -&gt; Field1Type</code> for free.</p>
<h2 data-number="5.6" id="sidenote-other-ways-of-defining-types"><span class="header-section-number">5.6</span> Sidenote: Other Ways of Defining Types</h2>
<p>In addition to the <code>data</code> keyword, there are two additional ways of defining types in Haskell.</p>
<p>The <code>newtype</code> keyword works like <code>data</code>, but you can only have a single constructor with a single field. It’s sometimes wise to use <code>newtype</code> for performance resons, but we’ll get back to those in part 2.</p>
<p>The <code>newtype</code> keyword works like <code>data</code>, but you can only have a single constructor with a single field. It’s sometimes wise to use <code>newtype</code> for performance reasons, but we’ll get back to those in part 2.</p>
<p>The <code>type</code> keyword introduces a <em>type alias</em>. Type aliases don’t affect type checking, they just offer a shorthand for writing types. For example the familiar <code>String</code> type is an alias for <code>[Char]</code>:</p>
<div class="sourceCode" id="cb373"><pre class="sourceCode haskell"><code class="sourceCode haskell"><span id="cb373-1"><a href="#cb373-1" aria-hidden="true" tabindex="-1"></a><span class="kw">type</span> <span class="dt">String</span> <span class="ot">=</span> [<span class="dt">Char</span>]</span></code></pre></div>
<p>This means that whenever the compiler reads <code>String</code>, it just immediately replaces it with <code>[Char]</code>. Type aliases seem useful, but they can easily make reading type errors harder.</p>
Expand Down