DataWeave Interview Question: Concatenate Elements of an Array

This article will help you practice your DataWeave skills in MuleSoft. Let's get started.

Input:

["m","u","l","e","s","o","f","t"]

Output:

xxxxxxxxxx

"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:

xxxxxxxxxx

%dw 2.0

output application/json

---

payload reduce ((item, accumulator) -> accumulator ++ item)

Approach 2 Code:

xxxxxxxxxx

%dw 2.0

output application/json

---

payload reduce ($$ ++ $)

Here, $$ stands for accumulator and $ stands for an item.

Output:

"mulesoft"

If you want reverse output then you can use any of the above approaches with a little modification.

Approach 1 Code:

xxxxxxxxxx

%dw 2.0

output application/json

---

payload reduce ((item, accumulator) -> item ++ accumulator)

Approach 2 Code:

xxxxxxxxxx

%dw 2.0

output application/json

---

payload reduce ($ ++ $$)

Output:

xxxxxxxxxx

"tfoselum"

Happy Learning!