The concat function concats two or more objects and gives an object back.

Syntax

output = concat(expression, expression)

Inputs

expression : a reference to a variable or any [[expression|Expressions]].

Output

output : a concatenated object from input.

Example flow

Schema input1 {
    string a
    b [string c]
    d {string e}
}

Schema input2 {
    string p
    q [string r]
    s {string t}
}

Schema concatOutput {
    string result1
    result2 [
        string op
    ]
    string result3
    string result4
    result5 [
        string op
    ]
    string result6
}

value inputValue1 -> input1 {
    "hello"
    b[{"12345"}]
    d{ "V1-120-a3qteenpmrvmjzjm45hrlr"}
}

value inputValue2 -> input2 {
    "world"
    q[{"V1-120-a3qteenpmrvmjzjm45hrlr"}]
    s{"12345"}
}

Mapping concatMapping input inputValue1 as x, inputValue2 as y output concatOutput as op {
    op.result1 = concat(x.a,y.p)
    op.result2 = concat(x.b,y.q)
    op.result3 = concat(x.d.e,y.s.t)  
    op.result4 = concat("",null) 
    op.result5 = concat(x.b,null)
    op.result6 = concat(null,null)
}

Output for Example Flow

{
    "result1": "helloworld",
    "result2": [
        {
            "c": "12345"
        },
        {
            "r": "V1-120-a3qteenpmrvmjzjm45hrlr"
        }
    ],
    "result3": "V1-120-a3qteenpmrvmjzjm45hrlr12345",
    "result4": "",
    "result5": [
        {
            "c": "12345"
        }
    ],
    "result6": null
}