JUDO
Mastering JSL: The Ultimate JUDO Quiz
Test your knowledge of JSL (JavaScript Language) and its foundational concepts in this engaging quiz! Whether you're a seasoned developer or a curious learner, this quiz is designed to sharpen your understanding of JUDO.
You'll encounter questions on:
- JSL names and model structures
- Entities and their fields
- Relations and compositions
- Derived members and boolean expressions
Which of the following statements is not true about JSL names?
Names are case-insensitive.
Name of elements must be unique within their scope in a case-insensitive manner.
The first character of a name must be a letter.
A name must not be longer than 128 characters.
Which of the following statements is not true about models?
References between model files are allowed.
A model file must start with the import statements.
Models consist of a sequence of JSL statements.
The model name may contain namespaces.
Which of the following statements is not true about enumerations?
The literal of an enumeration member must be uppercase.
An enumeration must have at least one member.
Enumeration members can be ordered by their ordinals.
Enumeration ordinals are used for database storage.
Which of the following statements is not true about entities?
An abstract entity cannot be instantiated.
Multiple inheritance is not allowed.
Entity without members is allowed.
Each instance of an entity has a universally unique system generated identifier.
Which of the following statements is not true about entity fields?
A primitive field cannot store a list of primitive values.
The self variable cannot be used in default expressions.
Identifiers cannot be undefined.
A composition is a field whose type is an entity.
Which of the following statements is not true about relations?
Relations can be collections.
The role name is the name of the relation.
The ‘required’ keyword can be used for any type of relations.
Both ends of a bidirectional relation cannot be required at the same time.
Which of the following statements is not true about compositions?
Deleting an entity instance deletes all instances in its composite fields.
The ‘field’ keyword is used to specify a composite field within an entity.
Compositions can be collections.
The keyword `required` is not allowed for compositions.
Which of the following statements is not true about derived members?
The value of a derived member cannot be set.
The getter expression is used to return the value of the derived member.
Derived members may return a collection of entity instances.
Use the assignment operator (=) to define the getter expression.
Which of the following statements is not true about queries?
A query is a request that retrieves primitive value only.
Static queries are within the scope of the model.
Queries are only calculated when the query is invoked.
Queries can have any number of arguments.
Which of the following statements is not true about expressions?
In expressions, the ‘!’ character is used for navigation.
Derived field values of an entity can be read in expressions.
To invoke a built-in function use the ‘!’ in an expression.
Static functions are invoked on types rather than on instances or collections.
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