AQLLetExpression

struct AQLLetExpression

Overview

Let expressions allow defining local variables within an expression scope, making complex expressions more readable and avoiding redundant computations.

Syntax

let var1 = expr1, var2 = expr2 in bodyExpression

Example Usage

// let fullName = firstName + ' ' + lastName in fullName.toUpperCase()
let letExpr = AQLLetExpression(
    bindings: [
        ("fullName", AQLBinaryExpression(
            left: firstNameExpr,
            op: .add,
            right: AQLBinaryExpression(
                left: AQLLiteralExpression(value: " "),
                op: .add,
                right: lastNameExpr
            )
        ))
    ],
    body: AQLCallExpression(
        source: AQLVariableExpression(name: "fullName"),
        methodName: "toUpperCase"
    )
)

Scoping

Variables defined in a let expression are only available within the body expression. They shadow any outer variables with the same name.