<div>
<pre><code class="code-1 nolinks" id="code-20-41822175-1">public Map&lt;String, String&gt; mapBully(Map&lt;String, String&gt; map) {
 String val=map.get(&quot;a&quot;);
 String backup=val;
 map.put(&quot;b&quot;,backup);
 map.put(&quot;a&quot;,&quot;&quot;);
 
 return map;
}
</code></pre>
 
failing two tests. 

<blockquote>
Expected &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Run &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
mapBully({&quot;b&quot;: &quot;dirt&quot;, &quot;a&quot;: &quot;candy&quot;}) → {&quot;b&quot;: &quot;candy&quot;, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&quot;b&quot;: &quot;candy&quot;, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;OK &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
mapBully({&quot;a&quot;: &quot;candy&quot;}) → {&quot;b&quot;: &quot;candy&quot;, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&quot;b&quot;: &quot;candy&quot;, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;OK &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
mapBully({&quot;b&quot;: &quot;carrot&quot;, &quot;c&quot;: &quot;meh&quot;, &quot;a&quot;: &quot;candy&quot;}) → {&quot;b&quot;: &quot;candy&quot;, &quot;c&quot;: &quot;meh&quot;, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&quot;b&quot;: &quot;candy&quot;, &quot;c&quot;: &quot;meh&quot;, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;OK &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
mapBully({&quot;b&quot;: &quot;carrot&quot;}) → {&quot;b&quot;: &quot;carrot&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&quot;b&quot;: null, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;X &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
mapBully({&quot;c&quot;: &quot;meh&quot;}) → {&quot;c&quot;: &quot;meh&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&quot;b&quot;: null, &quot;c&quot;: &quot;meh&quot;, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;X &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
mapBully({&quot;c&quot;: &quot;meh&quot;, &quot;a&quot;: &quot;sparkle&quot;}) → {&quot;b&quot;: &quot;sparkle&quot;, &quot;c&quot;: &quot;meh&quot;, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&quot;b&quot;: &quot;sparkle&quot;, &quot;c&quot;: &quot;meh&quot;, &quot;a&quot;: &quot;&quot;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;OK &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</blockquote>
please advise
</div>

<div>
<pre><code class="code-1 nolinks" id="code-20-41822192-1">public Map&lt;String, String&gt; mapBully(Map&lt;String, String&gt; map) {
 if(map.containsKey(&quot;a&quot;)){
 String val=map.get(&quot;a&quot;);
 String backup=val;
 map.put(&quot;b&quot;,backup);
 map.put(&quot;a&quot;,&quot;&quot;);
 }
 return map;
}
</code></pre>
above passes all tests. any improvements or alternate approaches?
</div>

<div>
&gt;&gt; any improvements 
Yes. 
1. Indent your code decently 
2. There's no need to work with those temporary variables 
 

<pre><code class="code-1 nolinks" id="code-20-41823011-1">public Map&lt;String, String&gt; mapBully(Map&lt;String, String&gt; map) {
 if (map.containsKey(&quot;a&quot;)) {
 map.put(&quot;b&quot;, map.get(&quot;a&quot;));
 map.put(&quot;a&quot;,&quot;&quot;);
 }
 return map;
}
</code></pre>
</div>

<div>
And you could have seen the code in the above post if you'd simply clicked the &quot;Show Solution&quot; button next to the &quot;Go&quot; button on the codingbat webpage you linked to.
</div>

<div>
<div class="content wysiwyg-content">
Hi, 
 
&nbsp;I am working on below challenge 
<a href="http://codingbat.com/prob/p197888" rel="ugc">http://codingbat.com/prob/p197888</a> 
 
 

<blockquote>
[/Map-1 &gt;&nbsp;mapBully 
prev &nbsp;| &nbsp;next &nbsp;| &nbsp;chance 
 
 
Modify and return the given map as follows: if the key &quot;a&quot; has a value, set the key &quot;b&quot; to have that value, and set the key &quot;a&quot; to have the value &quot;&quot;. Basically &quot;b&quot; is a bully, taking the value and replacing it with the empty string. 
 
mapBully({&quot;b&quot;: &quot;dirt&quot;, &quot;a&quot;: &quot;candy&quot;}) → {&quot;b&quot;: &quot;candy&quot;, &quot;a&quot;: &quot;&quot;} 
mapBully({&quot;a&quot;: &quot;candy&quot;}) → {&quot;b&quot;: &quot;candy&quot;, &quot;a&quot;: &quot;&quot;} 
mapBully({&quot;b&quot;: &quot;carrot&quot;, &quot;c&quot;: &quot;meh&quot;, &quot;a&quot;: &quot;candy&quot;}) → {&quot;b&quot;: &quot;candy&quot;, &quot;c&quot;: &quot;meh&quot;, &quot;a&quot;: &quot;&quot;} 

</blockquote>
 
how below got below result 
 
mapBully({&quot;a&quot;: &quot;candy&quot;}) → {&quot;b&quot;: &quot;candy&quot;, &quot;a&quot;: &quot;&quot;} 
 
there is no b in the input map right then how it came in the output map?
</div>
</div>

Hi,

 I am working on below challenge
http://codingbat.com/prob/p197888


[/Map-1 > mapBully 
prev  |  next  |  chance 


Modify and return the given map as follows: if the key "a" has a value, set the key "b" to have that value, and set the key "a" to have the value "". Basically "b" is a bully, taking the value and replacing it with the empty string.

mapBully({"b": "dirt", "a": "candy"}) → {"b": "candy", "a": ""}
mapBully({"a": "candy"}) → {"b": "candy", "a": ""}
mapBully({"b": "carrot", "c": "meh", "a": "candy"}) → {"b": "candy", "c": "meh", "a": ""} 


how below got below result

mapBully({"a": "candy"}) → {"b": "candy", "a": ""}

there is no b in the input map right then how it came in the output map?

mapBully challenge

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