Expressions

Arr.ai expressions are combinations of syntax which can be evaluated to produce some value. All arr.ai programs are expressions, and every value and operation in a program is an expression.

Implementation

Each expression is a type defined in the rel package, and implements the Expr interface:

type Expr interface {
    // All exprs can be serialized to strings with the String() method.
	fmt.Stringer

	// Eval evaluates the expr in a given scope.
	Eval(ctx context.Context, local Scope) (Value, error)

    // Source returns the Scanner that locates the expression in a source file.
	Source() parser.Scanner
}