A class that stores an expression you can execute. An expression can be made of any arithmetic operation, built-in math function call, method call of a passed instance, or built-in type construction call. An example expression text using the built-in math functions could be [code]sqrt(pow(3,2) + pow(4,2))[/code]. In the following example we use a [LineEdit] node to write our expression and show the result. [codeblock] onready var expression = Expression.new() func _ready(): $LineEdit.connect("text_entered", self, "_on_text_entered") func _on_text_entered(command): var error = expression.parse(command, []) if error != OK: print(expression.get_error_text()) return var result = expression.execute([], null, true) if not expression.has_execute_failed(): $LineEdit.text = str(result) [/codeblock] Executes the expression that was previously parsed by [method parse] and returns the result. Before you use the returned object, you should check if the method failed by calling [method has_execute_failed]. If you defined input variables in [method parse], you can specify their values in the inputs array, in the same order. Returns the error text if [method parse] has failed. Returns [code]true[/code] if [method execute] has failed. Parses the expression and returns an [enum Error] code. You can optionally specify names of variables that may appear in the expression with [code]input_names[/code], so that you can bind them when it gets executed.