EvaluableExpression.go
func NewEvaluableExpression(expression string) (*EvaluableExpression, error) {

	functions := make(map[string]ExpressionFunction)
	return NewEvaluableExpressionWithFunctions(expression, functions)
}
func NewEvaluableExpression(expression string) (*EvaluableExpression, error) {

	functions := make(map[string]ExpressionFunction)
	return NewEvaluableExpressionWithFunctions(expression, functions)
}
/*
	Parses a new EvaluableExpression from the given [expression] string.
	Returns an error if the given expression has invalid syntax.
*/