Method AddLetVar

repl/evaluator.go:612–623

AddLetVar adds a let variable to the evaluation context. The expression is planned but evaluated lazily.

(name string, expr string, typeHint *envlib.TypeDesc)

// AddLetVar adds a let variable to the evaluation context.
// The expression is planned but evaluated lazily.
func (e *Evaluator) AddLetVar(name string, expr string, typeHint *envlib.TypeDesc) error {
	// copy the current context and attempt to update dependant expressions.
	// if successful, swap the current context with the updated copy.
	ctx := e.ctx.copy()
	ctx.addLetVar(name, expr, typeHint)
	err := updateContextPlans(ctx, e.env)
	if err != nil {
		return err
	}
	e.ctx = *ctx
	return nil
}

// AddLetFn adds a let function to the evaluation context.
func (e *Evaluator) AddLetFn(name string, params []letFunctionParam, resultType *envlib.TypeDesc, expr string) error {