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Expressions — Examples

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Expressions provide a wide range of computations. Some examples of expressions are:

Constants

An expression can be as simple as a single literal constant.

"Good Evening"
142
true
20050705
0x143F871A

Single property references

An expression can reference a single property, identifying the page on which it is found. In the context of an activity, an expression can reference a parameter or local variable.

.Price
parameters
MortgageLoan.Application.ZIPCode
primary.pyLabel

Aggregate property references

You can identify aggregate properties or parts of aggregate properties. (The property mode of the target must match the result of the expression.)

MortgageLoan.Application.Address(4)
Globe.Division(7).Unit("West")
Invoices.pyOrders(2).pyItems("Manuals").pyItemNames

Linked property references

You can identify properties accessed through linked properties, using the syntax .property1.property2., where property1 is the linked property and property2 is a property reference in the linked class.

Note the initial period character before the property name. (When no initial period is present, the system assumes that property1 is a page name.)
.pyUpdateOperator.pyLabel
.pyUpdateOperator.pySkillsPrimary(6)

Arithmetic, logical, and comparison operators

You can use most Java operators for arithmetic, string operations, comparisons, and conditions. Use parentheses to control the order of evaluation.

.Price * (1+(.Tax/100)) + ShipInfoPage.ShippingCost
.pyEffortActual >= .pyEffortForecast
3.14159*.radius *.radius

Function calls

Your expressions can call built-in functions, functions in standard libraries, and custom functions.

@SUM(.SubComponents().Price)
@Pega-RULES:MapTo.Function(argument1, argument2)

All combined

Expressions can incorporate all the elements described in this topic together:

@SUM(.SubComponents(38+.Offset).Price)

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