DataWeave Interview Question: Find If Prime Number

A prime number is a number that is greater than 1 and divided by 1 or itself. In other words, prime numbers can't be divided by other numbers than themselves or 1. For example 2, 3, 5, 7, 11, 13, 17, 19, 23.... are the prime numbers.

Note: Please use 3 or greater than 3 for this logic.

Input Payload:

xxxxxxxxxx

7

Output Result:

xxxxxxxxxx

"7 is prime number"

In Step 1, we will apply a map starting from 2 till (payload - 1).

After that, we will use the mod operator to check reminders of payload by item.

Step 1 Code:

xxxxxxxxxx

%dw 2.0

output application/json

---

(2 to payload-1) map ((item, index) -> payload mod item)

Step 1 Output:

xxxxxxxxxx

[

 1,

 1,

 3,

 2,

 1

]

In Step 2, we will use an if statement and check whether the output array of our previous step contains 0 or not.

If 0 is present it means our payload is completely divided by another number and hence it is not a prime number.

If 0 is not present it means our payload is not completely divided by another number and hence it is a prime number.

Final Code:

xxxxxxxxxx

%dw 2.0

output application/json

---

if(((2 to payload-1) map ((item, index) -> payload mod item) contains 0) == true) payload ++ " is not prime number" else payload ++ " is prime number"

Output:

xxxxxxxxxx

"7 is prime number"

Hope this helps improve your DataWeave skills. I am not an expert on DataWeave. I am just sharing what I can solve. Comments are welcome. Thanks.