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<Array>.Filter (Function) In french: <Tableau>.Filtre Returns an array containing the elements of a source array for which a procedure returns True. This function can be used: - on one-dimensional arrays s,
Syntax
<Result> = <Source array>.Filter(<Condition to check>)
<Result>: WLanguage array Array that contains the elements of the <Source array> for which the <Condition to check> returns True. <Source array>: WLanguage array Name of the Array variable to use. This array can be: <Condition to check>: WLanguage procedure Name of the WLanguage procedure to be executed for each element of the <Source array>. This procedure must return True or False.
This procedure can be: - a global or local procedure,
- an internal procedure.
It is also possible to directly use a lambda procedure. Remarks Operating mode The Procedure is called for each element of the source array by passing the parameter: - the array source element,
 New in version 2024the key to the element. In the case of a simple array, the key corresponds to the element index. This parameter is optional. In the case of an associative array, the key corresponds to the element indexing key..   Not available.
If the procedure returns True, the element from the source array is stored in the <Result> array.
Sequence of functionsYou can use array functions in a sequence. The following functions can be used in a sequence: This sequence can be used as a source for a FOR ALL statement or it can end with one of the following functions: Example: gnMoyenne = gtabUser.Filtre(cbFiltre).Map(cbTransforme).Mean()
Related Examples:
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Unit examples (WINDEV): Filter / Map / Reduce
[ + ] This example shows how to use the Filter / Map / Reduce functions. The Filter / Map / Reduce concept allows performing operations on sets of data in a remarkably concise way. Filter is used to filter an array of elements in a customized way (with a callback procedure). Map is used to transform an array of elements, also with a callback procedure. Reduce is used to aggregate data in a customized way with a callback procedure. Here, this example is used to calculate the average age of women among the users displayed in the table below.
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