DataWeave Interview Question: Concatenate Elements of an Array
This article will help you practice your DataWeave skills in MuleSoft. We're going to use two different approaches to concatenate an array of letters.
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Input:
JSON
x
1
["m","u","l","e","s","o","f","t"]
Output:
JSON
xxxxxxxxxx
1
1
"mulesoft"
Let's talk about the solution now.
We will apply a reduce function to our input and add the value of the item with the value of the accumulator.
Approach 1 Code:
Java
xxxxxxxxxx
1
1
%dw 2.0
2
output application/json
3
---
4
payload reduce ((item, accumulator) -> accumulator ++ item)
Approach 2 Code:
Java
xxxxxxxxxx
1
1
%dw 2.0
2
output application/json
3
---
4
payload reduce ($$ ++ $)
Here, $$ stands for accumulator and $ stands for an item.
Output:
JSON
x
1
"mulesoft"
If you want reverse output then you can use any of the above approaches with a little modification.
Approach 1 Code:
Java
xxxxxxxxxx
1
1
%dw 2.0
2
output application/json
3
---
4
payload reduce ((item, accumulator) -> item ++ accumulator)
Approach 2 Code:
Java
xxxxxxxxxx
1
1
%dw 2.0
2
output application/json
3
---
4
payload reduce ($ ++ $$)
Output:
JSON
xxxxxxxxxx
1
1
"tfoselum"
Happy Learning!
Data structure
Interview (journalism)
Element
Java (programming language)
JSON
MuleSoft
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