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   booleanExpression as xs.boolean,
   valueExpression as String
) as whenExpression


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.

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.


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')],

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