N/workbook Module
workbook.Expression
Object Description: An expression. An expression can be used when you create a pivot definition, a chart definition, a data dimension item, a measure, a conditional filter, or a constant. You can create an expression using workbook.createExpression(options).
Supported Script Types: Server scripts For more information, see SuiteScript 2.0 Script Types.
Module: N/workbook Module
Methods and Properties: Expression Object Members
Since: 2020.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=workbook.Expression

// Code Example 1

// Add additional code

//...

// Create a basic Expression

var myExpression = workbook.createExpression({

    functionId: query.Operator.EMPTY

});



// Create a complete Expression

var myExpression = workbook.createExpression({

    functionId: query.Operator.EQUAL,

    parameters: {

        parm1: 15

    }

});



// View a workbook.DimensionSort used in a ChartDefinition and a PivotDefinition

var myWorkbook = workbook.load ({

    id: myWorkbookId

});



// Note that some Expression properties may be empty/null based on the loaded workbook

var myChartExpression = myWorkbook.chartDefinitions[0].filterExpressions[0];

log.audit({

    title: 'ChartDefinition Expression.functionId = ',

    details: myChartExpression.functionId

});

log.audit({

    title: 'ChartDefinition Expression.parameters = ',

    details: myChartExpression.parameters

});



var myPivotExpression = myWorkbook.pivotDefinitions[0].filterExpressions[0];

log.audit({

    title: 'PivotDefinition Expression.functionId = ',

    details: myPivotExpression.functionId

});

log.audit({

    title: 'PivotDefinition Expression.parameters = ',

    details: myPivotExpression.parameters

});

//...

// Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_159008229845.html