DataWeave Interview Question: Find Unique Names From the Input
A quick tutorial article that shows you the code you need to better work with Dataweave and Mulesoft, focusing on a common interview question.
This article will help you practice your DataWeave skills in MuleSoft. Here we will find unique names from our Input. Let's get started.
Input:
JSON
x
1
[[
2
{
3
"name":"john"
4
},
5
{
6
"name":"leonardo"
7
}
8
],
9
[
10
{
11
"name": "leonardo"
12
},
13
{
14
"name": "alicia"
15
},
16
{
17
"name": "jennifer"
18
},
19
{
20
"name": "john"
21
}
22
]]
Output:
JSON
xxxxxxxxxx
1
11
9
1
[
2
"john",
3
"leonardo",
4
"alicia",
5
"jennifer"
6
]
Let's talk about the solution now. We are going to achieve this in multiple steps as follows:
Step 1 Output:
JSON
xxxxxxxxxx
1
15
9
1
[
2
"john",
3
"leonardo",
4
"leonardo",
5
"alicia",
6
"jennifer",
7
"john"
8
]
In order to get output like this, we will use below code:
Java
xxxxxxxxxx
1
1
%dw 2.0
2
3
output application/json
4
5
---
6
7
flatten(payload map ((item, index) -> item.name))
Step 2 will have the final output. We will use the below code to achieve the same.
Java
xxxxxxxxxx
1
1
%dw 2.0
2
3
output application/json
4
5
---
6
7
flatten(payload map ((item, index) -> item.name)) distinctBy ((item, index) -> item)
Hope this helps improve your DataWeave skills. Thanks!
Interview (journalism)
JSON
Java (programming language)
MuleSoft
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