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A square can't have different width and height

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This commit is contained in:
Mark McGranaghan 2015-04-19 08:26:23 -07:00
parent 518a807773
commit 8b66bf7fcb
3 changed files with 23 additions and 23 deletions
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20
examples/interfaces/interfaces.go
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@ -13,8 +13,8 @@ type geometry interface {
} }
// For our example we'll implement this interface on // For our example we'll implement this interface on
// `square` and `circle` types. // `rect` and `circle` types.
type square struct { type rect struct {
width, height float64 width, height float64
} }
type circle struct { type circle struct {
@ -23,12 +23,12 @@ type circle struct {
// To implement an interface in Go, we just need to // To implement an interface in Go, we just need to
// implement all the methods in the interface. Here we // implement all the methods in the interface. Here we
// implement `geometry` on `square`s. // implement `geometry` on `rect`s.
func (s square) area() float64 { func (r rect) area() float64 {
return s.width * s.height return r.width * r.height
} }
func (s square) perim() float64 { func (r rect) perim() float64 {
return 2*s.width + 2*s.height return 2*r.width + 2*r.height
} }
// The implementation for `circle`s. // The implementation for `circle`s.
@ -50,13 +50,13 @@ func measure(g geometry) {
} }
func main() { func main() {
s := square{width: 3, height: 4} r := rect{width: 3, height: 4}
c := circle{radius: 5} c := circle{radius: 5}
// The `circle` and `square` struct types both // The `circle` and `rect` struct types both
// implement the `geometry` interface so we can use // implement the `geometry` interface so we can use
// instances of // instances of
// these structs as arguments to `measure`. // these structs as arguments to `measure`.
measure(s) measure(r)
measure(c) measure(c)
} }

4
examples/interfaces/interfaces.hash
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@ -1,2 +1,2 @@
9bafbade1f5effc38be233c3fd12cbdd7c6e226d 3547b935d1e0322c0fb696726c27cae53a275e0a
guxTzcucR- 313UebA3rD

22
public/interfaces
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@ -40,7 +40,7 @@ signatures.</p>
</td> </td>
<td class="code leading"> <td class="code leading">
<a href="http://play.golang.org/p/guxTzcucR-"><img title="Run code" src="play.png" class="run" /></a> <a href="http://play.golang.org/p/313UebA3rD"><img title="Run code" src="play.png" class="run" /></a>
<div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span> <div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span>
</pre></div> </pre></div>
@ -79,12 +79,12 @@ signatures.</p>
<tr> <tr>
<td class="docs"> <td class="docs">
<p>For our example we&rsquo;ll implement this interface on <p>For our example we&rsquo;ll implement this interface on
<code>square</code> and <code>circle</code> types.</p> <code>rect</code> and <code>circle</code> types.</p>
</td> </td>
<td class="code leading"> <td class="code leading">
<div class="highlight"><pre><span class="kd">type</span> <span class="nx">square</span> <span class="kd">struct</span> <span class="p">{</span> <div class="highlight"><pre><span class="kd">type</span> <span class="nx">rect</span> <span class="kd">struct</span> <span class="p">{</span>
<span class="nx">width</span><span class="p">,</span> <span class="nx">height</span> <span class="kt">float64</span> <span class="nx">width</span><span class="p">,</span> <span class="nx">height</span> <span class="kt">float64</span>
<span class="p">}</span> <span class="p">}</span>
<span class="kd">type</span> <span class="nx">circle</span> <span class="kd">struct</span> <span class="p">{</span> <span class="kd">type</span> <span class="nx">circle</span> <span class="kd">struct</span> <span class="p">{</span>
@ -99,16 +99,16 @@ signatures.</p>
<td class="docs"> <td class="docs">
<p>To implement an interface in Go, we just need to <p>To implement an interface in Go, we just need to
implement all the methods in the interface. Here we implement all the methods in the interface. Here we
implement <code>geometry</code> on <code>square</code>s.</p> implement <code>geometry</code> on <code>rect</code>s.</p>
</td> </td>
<td class="code leading"> <td class="code leading">
<div class="highlight"><pre><span class="kd">func</span> <span class="p">(</span><span class="nx">s</span> <span class="nx">square</span><span class="p">)</span> <span class="nx">area</span><span class="p">()</span> <span class="kt">float64</span> <span class="p">{</span> <div class="highlight"><pre><span class="kd">func</span> <span class="p">(</span><span class="nx">r</span> <span class="nx">rect</span><span class="p">)</span> <span class="nx">area</span><span class="p">()</span> <span class="kt">float64</span> <span class="p">{</span>
<span class="k">return</span> <span class="nx">s</span><span class="p">.</span><span class="nx">width</span> <span class="o">*</span> <span class="nx">s</span><span class="p">.</span><span class="nx">height</span> <span class="k">return</span> <span class="nx">r</span><span class="p">.</span><span class="nx">width</span> <span class="o">*</span> <span class="nx">r</span><span class="p">.</span><span class="nx">height</span>
<span class="p">}</span> <span class="p">}</span>
<span class="kd">func</span> <span class="p">(</span><span class="nx">s</span> <span class="nx">square</span><span class="p">)</span> <span class="nx">perim</span><span class="p">()</span> <span class="kt">float64</span> <span class="p">{</span> <span class="kd">func</span> <span class="p">(</span><span class="nx">r</span> <span class="nx">rect</span><span class="p">)</span> <span class="nx">perim</span><span class="p">()</span> <span class="kt">float64</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">2</span><span class="o">*</span><span class="nx">s</span><span class="p">.</span><span class="nx">width</span> <span class="o">+</span> <span class="mi">2</span><span class="o">*</span><span class="nx">s</span><span class="p">.</span><span class="nx">height</span> <span class="k">return</span> <span class="mi">2</span><span class="o">*</span><span class="nx">r</span><span class="p">.</span><span class="nx">width</span> <span class="o">+</span> <span class="mi">2</span><span class="o">*</span><span class="nx">r</span><span class="p">.</span><span class="nx">height</span>
<span class="p">}</span> <span class="p">}</span>
</pre></div> </pre></div>
@ -160,7 +160,7 @@ to work on any <code>geometry</code>.</p>
<td class="code leading"> <td class="code leading">
<div class="highlight"><pre><span class="kd">func</span> <span class="nx">main</span><span class="p">()</span> <span class="p">{</span> <div class="highlight"><pre><span class="kd">func</span> <span class="nx">main</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">s</span> <span class="o">:=</span> <span class="nx">square</span><span class="p">{</span><span class="nx">width</span><span class="p">:</span> <span class="mi">3</span><span class="p">,</span> <span class="nx">height</span><span class="p">:</span> <span class="mi">4</span><span class="p">}</span> <span class="nx">r</span> <span class="o">:=</span> <span class="nx">rect</span><span class="p">{</span><span class="nx">width</span><span class="p">:</span> <span class="mi">3</span><span class="p">,</span> <span class="nx">height</span><span class="p">:</span> <span class="mi">4</span><span class="p">}</span>
<span class="nx">c</span> <span class="o">:=</span> <span class="nx">circle</span><span class="p">{</span><span class="nx">radius</span><span class="p">:</span> <span class="mi">5</span><span class="p">}</span> <span class="nx">c</span> <span class="o">:=</span> <span class="nx">circle</span><span class="p">{</span><span class="nx">radius</span><span class="p">:</span> <span class="mi">5</span><span class="p">}</span>
</pre></div> </pre></div>
@ -169,7 +169,7 @@ to work on any <code>geometry</code>.</p>
<tr> <tr>
<td class="docs"> <td class="docs">
<p>The <code>circle</code> and <code>square</code> struct types both <p>The <code>circle</code> and <code>rect</code> struct types both
implement the <code>geometry</code> interface so we can use implement the <code>geometry</code> interface so we can use
instances of instances of
these structs as arguments to <code>measure</code>.</p> these structs as arguments to <code>measure</code>.</p>
@ -177,7 +177,7 @@ these structs as arguments to <code>measure</code>.</p>
</td> </td>
<td class="code"> <td class="code">
<div class="highlight"><pre> <span class="nx">measure</span><span class="p">(</span><span class="nx">s</span><span class="p">)</span> <div class="highlight"><pre> <span class="nx">measure</span><span class="p">(</span><span class="nx">r</span><span class="p">)</span>
<span class="nx">measure</span><span class="p">(</span><span class="nx">c</span><span class="p">)</span> <span class="nx">measure</span><span class="p">(</span><span class="nx">c</span><span class="p">)</span>
<span class="p">}</span> <span class="p">}</span>
</pre></div> </pre></div>