concat
Concatenates the strings supplied as arguments into one string. To concatenate all items of an object of type "list of string", use the string-join function.
Signature
concat(string1:string, string2:string, stringN:string) -> string  | 
Parameters
Name  | Type  | Description  | 
|---|---|---|
string1  | string  | Specifies a single string item to join. All subsequent arguments must be separated by a comma.  | 
string2  | string  | Same as above.  | 
stringN  | string  | Same as above.  | 
Examples
The following expression returns "abc":
concat('a', 'b', 'c')  |