Empty class
Check whether an instance is empty. Return true if the input is empty. Empty means: 1.Input is null or undefined. 2.Input is a null or empty string. 3.Input is zero size collection. 4.Input is an object with no property.
- Extends
Constructors
| Empty() | Initializes a new instance of the Empty class. |
Properties
| negation | Gets the evaluator that is a negation of this one. Sets the evaluator that is a negation of this one. |
Inherited Properties
| return |
Type expected by evaluating the expression. |
| type | Gets the expression type for evaluator. |
Inherited Methods
| try |
Evaluate an expression. |
| validate |
Validate an expression. |
Constructor Details
Empty()
Initializes a new instance of the Empty class.
new Empty()Property Details
negation
Gets the evaluator that is a negation of this one. Sets the evaluator that is a negation of this one.
ExpressionEvaluator negationProperty Value
The evaluator that is a negation of this one.
Inherited Property Details
returnType
Type expected by evaluating the expression.
returnType: ReturnTypeProperty Value
Inherited From ExpressionEvaluator.returnType
type
Gets the expression type for evaluator.
type: stringProperty Value
string
Inherited From ExpressionEvaluator.type
Inherited Method Details
tryEvaluate(Expression, MemoryInterface, Options)
Evaluate an expression.
function tryEvaluate(expression: Expression, state: MemoryInterface, options: Options): ValueWithErrorParameters
- expression
- Expression
Expression to evaluate.
- state
- MemoryInterface
Global state information.
- options
- Options
Options used in the evaluation.
Returns
The value and error string that is non-null if there is an error.
Inherited From ExpressionEvaluator.tryEvaluate
validateExpression(Expression)
Validate an expression.
function validateExpression(expression: Expression)Parameters
- expression
- Expression
Expression to validate.
Inherited From ExpressionEvaluator.validateExpression