DW 2.0 functions

01-DW-2.md

DataWeave 2.0 Cheatsheet

Object Concatenation

(object-concatenation.dwl)

• Using ++
• Using {( )}
• Using {([ ])}

String Concatenation

(string-concatenation.dwl)

• Using ++
• Using $()

Null Checkers

(null-checkers.dwl)

• default
• if/else
• (key: value) if condition

null-checkers.dwl

%dw 2.0
output application/dw

var obj = {
   FirstName: "Alexandra",
   LastName: "Martinez"
}

fun concat(str1, str2) = (
    (str1 default "")
    ++
    (if (str1 != null and str2 != null) 
        " "
    else "")
    ++
    (str2 default "")
)
---
{
    (obj),
    Name: obj.FirstName concat obj.LastName,
    Name1: obj.FirstName concat null,
    Name2: null concat obj.LastName,
    (Name3: null concat null) 
        if (concat(null,null) != "")
}

object-concatenation.dwl

%dw 2.0
output application/json
 
var object1 = {
	"Key1": "Value1",
	"Key2": {
		"Key3": "Value3"
	}
}

var object2 = {
	"Key4": "Value4",
	"Key5": {
		"Key6": "Value6"
	}
}
---
// Using ++ 
//object1 ++ object2
//++(object1, object2)

// Using {( )}
// {
//     (object1),
//     (object2)
// }

// Using {([ ])}
{([
    object1,
    object2
])}

string-concatenation.dwl

%dw 2.0
output application/dw
 
var str = "World"

var obj = {
    text: "World"
}
---
{
    opt1: "Hello $(str)!",
    opt2: "Hello $(obj.text)!",
    opt3: "1+1=$(1+1)",
    opt4: "Hello " ++ str ++ "!"
}