filter() Function
This function may not be compatible with all features of Appian. For details, see the Feature Compatibility section below.

Function

filter( predicate, list, context )

Calls a predicate for each item in a list and returns any items for which the returned value is true.

Parameters

Keyword Type Description

predicate

Function, Rule, or Data Type Constructor

Expression that returns a Boolean (true or false).

list

Any Type Array

List of elements that the predicate iterates through.

context

Any Type Array

Variable number of parameters passed directly into each predicate evaluation.

Returns

Any Type Array

Usage considerations

Referencing expressions and rules

Use fn!functionName to reference an expression function and rule!ruleName to reference a rule.

Limitations

a!forEach() cannot be used within rules used in this function.

Examples

filter(fn!iseven,{-1,0,1,2},1) returns 0, 2

Feature compatibility

The table below lists this function's compatibility with various features in Appian.
Feature Compatibility Note
Portals Compatible
Offline Mobile Compatible
Custom Record Field Expressions Compatible
Open in Github Built: Fri, Aug 12, 2022 (10:01:45 AM)

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