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  4. Dataweave Interview Question Using Map and Reduce

Dataweave Interview Question Using Map and Reduce

This article will help you practice your Dataweave skills in Mulesoft. Here we have to convert the input to a specific type of output.

By 
Gaurav Dubey user avatar
Gaurav Dubey
·
Jan. 13, 21 · Tutorial
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This article will help you practice your Dataweave skills in Mulesoft. Here we have to convert the input to a specific type of output. Let's get started.

Input:

JSON
 




x
19


 
1
[
2
    {
3
        "param_name": "first",
4
        "param_value": "second"
5
    },
6
    {
7
        "param_name": "third",
8
        "param_value": "fourth"
9
    }
10
]



Output:

JSON
 




xxxxxxxxxx
1


 
1
{
2
  "first": "second",
3
  "third": "fourth"
4
}



Let's talk about the solution now. We are going to achieve this in two steps as follows.

Step 1 

The below code is our desired output:

JSON
 




xxxxxxxxxx
1
15
9


 
1
[
2
  {
3
    "first": "second"
4
  },
5
  {
6
    "third": "fourth"
7
  }
8
]



In order to get output like this, we will use the below code:

Java
 




xxxxxxxxxx
1


 
1
%dw 2.0
2

          
3
output application/json
4

          
5
---
6

          
7
payload map ((item, index) -> (item.param_name):item.param_value)



Step 2

This will give us the final output. We use the below code to achieve the same:

Java
 




xxxxxxxxxx
1


 
1
%dw 2.0
2

          
3
output application/json
4

          
5
---
6

          
7
payload map ((item, index) -> (item.param_name):item.param_value) reduce ((item, accumulator) -> accumulator ++ item)



I hope this helps improve your Dataweave skills. Thanks!

Interview (journalism) JSON Java (programming language) Convert (command) MuleSoft

Opinions expressed by DZone contributors are their own.

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  • DataWeave Interview Question: Concatenate Elements of an Array
  • DataWeave Interview Question: Find Unique Names From the Input
  • How to Convert JSON to XML or XML to JSON in Java
  • DataWeave Interview Question: Compare IDs From Two Arrays and Create a New Array

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