Introduction to Talend Data Mapper functions
Talend Data Mapper relies on a large set of functions to create expressions and perform transformations.
This guide lists all the function available in the Mapping perspective of Talend Studio, with some examples of the functions used in mappings.
Core concepts
- A property is a parameter in a function that accepts a fixed value. It can be defined
by double-clicking a function. The Constant function, for
example, has three properties.
- An argument is a parameter in a function that can accept an expression or a map
element as its value. Two types of arguments exist:
- Fixed arguments: you can only add some specific arguments to the function. For
example, the ExtractFromDateTime function accepts a single
Value argument.
- Variable arguments: you can add as many arguments as needed to the function. For
example, you can add as many arguments to the Concat function
as needed in order to concatenate these elements into a single string.
- Fixed arguments: you can only add some specific arguments to the function. For
example, the ExtractFromDateTime function accepts a single
Value argument.