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XQuery op:when

MarkLogic Server 11.0 Product Documentation
op.when

op.when(
   booleanExpression as xs.boolean,
   valueExpression as String
) as whenExpression

Summary

This function executes the specified expression if the specified condition is true for the row. Otherwise, the expression is not executed and the next 'when' test is checked or, if there is no next 'when' text, the otherwise expression for the op.case expression is executed.

Parameters
booleanExpression A boolean expression. See Boolean Expression Functions for the list of functions used to build boolean expressions.
valueExpression The value expression to return if the boolean expression is true.

Example

const op = require('/MarkLogic/optic');
const employees = op.fromView('main', 'employees');

employees.select(['EmployeeID', op.as('cased', op.case([
                   op.when(op.eq(op.col('EmployeeID'), 2), 'second'),
                   op.when(op.eq(op.col('EmployeeID'), 3), 'third')],
                   'otherwise'))])
          .result();

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