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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. There are two types of arguments:
    • 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.
In some cases, the same parameter is available as both a property and an argument. If both are specified, the argument value is used and the property value is ignored.

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