Can you give me an example of how you would use for loops in a dataweave expression? in MuleSoft 18

 Can you give me an example of how you would use for loops in a data weave expression? in Mule Soft

Using for loops in DataWeave for MuleSoft 4

Sure, here are a few examples of how you can use for loops in DataWeave expressions within MuleSoft 4:

1. Iterating over an array and transforming each element:

Code snippet

%dw 2.0

input = ["apple", "banana", "cherry"];

output = input map ((item) -> "Fruit: " ++ item);

// Equivalent using a for loop
output = input for (i, item) ->
  "Fruit " ++ (i + 1) ++ ": " ++ item;

2. Filtering elements based on specific conditions:

Code snippet

%dw 2.0

input = [
  { name: "Alice", age: 30 },
  { name: "Bob", age: 25 },
  { name: "Charlie", age: 35 }
];

output = input for (i, person) ->
  if (person.age >= 30) person else null;

// Equivalent using a filter expression
output = input filter ((person) -> person.age >= 30);

3. Building complex data structures dynamically:

Code snippet

%dw 2.0

input = ["red", "green", "blue"];

output = {
  colors: input fold ((color, colors) -> colors ++ { color: color }), []
};

// Equivalent using a for loop
output = {
  colors: [] for (i, color) in input {
    color: color
  }
};

4. Accumulating values during iteration:

Code snippet

%dw 2.0

input = [1, 2, 3, 4];

output = input reduce ((item, sum) -> sum + item);

// Equivalent using a for loop and accumulator variable
output = input fold ((item, sum) -> sum + item, 0);

Remember that for loops offer an alternative way to process arrays in DataWeave, but sometimes using built-in functions like map, filter, or reduce might lead to more concise and readable expressions. Choose the approach that best suits your specific needs and coding style.

I hope these examples help! Feel free to ask if you have any further questions or need more specific examples based on your use case.