Solved

mapBully challenge

Posted on 2016-09-27
6
113 Views
Last Modified: 2016-09-30
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?
0
Comment
Question by:gudii9
6 Comments
 
LVL 37

Accepted Solution

by:
zzynx earned 250 total points
ID: 41819221
>> there is no b in the input map right then how it came in the output map?

It exactly does what is required:
Modify and return the given map as follows:
1) if the key "a" has a value, set the key "b" to have that value,
   {"a": "candy"}  == becomes ==> {"a": "candy", "b": "candy"}
2) and set the key "a" to have the value ""
   {"a": "candy", "b": "candy"}  == becomes ==> {"a": "", "b": "candy"}
0
 
LVL 35

Assisted Solution

by:mccarl
mccarl earned 250 total points
ID: 41821042
there is no b in the input map right then how it came in the output map?

Because your code will add the "b" to the map
0
 
LVL 7

Author Comment

by:gudii9
ID: 41822175
public Map<String, String> mapBully(Map<String, String> map) {
  String val=map.get("a");
  String backup=val;
  map.put("b",backup);
  map.put("a","");
  
  return map;
}

Open in new window


failing two tests.
Expected      Run            
mapBully({"b": "dirt", "a": "candy"}) → {"b": "candy", "a": ""}      {"b": "candy", "a": ""}      OK      
mapBully({"a": "candy"}) → {"b": "candy", "a": ""}      {"b": "candy", "a": ""}      OK      
mapBully({"b": "carrot", "c": "meh", "a": "candy"}) → {"b": "candy", "c": "meh", "a": ""}      {"b": "candy", "c": "meh", "a": ""}      OK      
mapBully({"b": "carrot"}) → {"b": "carrot"}      {"b": null, "a": ""}      X      
mapBully({"c": "meh"}) → {"c": "meh"}      {"b": null, "c": "meh", "a": ""}      X      
mapBully({"c": "meh", "a": "sparkle"}) → {"b": "sparkle", "c": "meh", "a": ""}      {"b": "sparkle", "c": "meh", "a": ""}      OK      
please advise
0
DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

 
LVL 7

Author Comment

by:gudii9
ID: 41822192
public Map<String, String> mapBully(Map<String, String> map) {
  if(map.containsKey("a")){
  String val=map.get("a");
  String backup=val;
  map.put("b",backup);
  map.put("a","");
  }
  return map;
}

Open in new window

above passes all tests. any improvements or alternate approaches?
0
 
LVL 37

Expert Comment

by:zzynx
ID: 41823011
>> any improvements
Yes.
1. Indent your code decently
2. There's no need to work with those temporary variables

public Map<String, String> mapBully(Map<String, String> map) {
    if (map.containsKey("a")) {
       map.put("b", map.get("a"));
       map.put("a","");
    }
    return map;
}

Open in new window

0
 
LVL 12

Expert Comment

by:tel2
ID: 41823016
And you could have seen the code in the above post if you'd simply clicked the "Show Solution" button next to the "Go" button on the codingbat webpage you linked to.
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Computer science students often experience many of the same frustrations when going through their engineering courses. This article presents seven tips I found useful when completing a bachelors and masters degree in computing which I believe may he…
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now