Package dev.frostlake.executor.expressions

Class LambdaExpression

java.lang.Object

dev.frostlake.executor.expressions.LambdaExpression

All Implemented Interfaces:

Expression

public class LambdaExpression
extends Object
implements Expression

A lambda argument to a higher-order function — <param> -> <body> or (<param>, …) -> <body> (e.g. x -> x + 1, (acc, val) -> acc + val). Parameter names are kept alongside any DECLARED parameter type, which is significant: an element normally binds as a VARIANT, so arithmetic on it yields FLOAT, while a declared type casts it first. Live-verified on a real account: TRANSFORM([1,2], a -> a * 2) is [2.000000000000000e+00,4.000000000000000e+00] but TRANSFORM([1,2], a INT -> a * 2) is [2,4]. It is not evaluated on its own — TRANSFORM/FILTER/REDUCE apply the body per array element with the parameters bound to the element (and accumulator).

Constructor Summary

Constructors

Constructor	Description
LambdaExpression(List<String> parameters, List<String> parameterTypes, Expression body)

Method Summary

Modifier and Type	Method	Description
<T> T	accept(ExpressionVisitor<T> visitor)	Accept a visitor for the visitor pattern
Expression	getBody()
List<String>	getParameters()
List<String>	getParameterTypes()	The declared type of each parameter, positionally — null where the parameter was written without one.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

LambdaExpression

public LambdaExpression(List<String> parameters,
 List<String> parameterTypes,
 Expression body)

Method Details

getParameters

public List<String> getParameters()

getParameterTypes

public List<String> getParameterTypes()

The declared type of each parameter, positionally — null where the parameter was written without one.

getBody

public Expression getBody()

accept

public <T> T accept(ExpressionVisitor<T> visitor)

Description copied from interface: Expression

Accept a visitor for the visitor pattern

Specified by:

accept in interface Expression

toString

public String toString()

Overrides:

toString in class Object