Mandatory Value Constraints

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Mandatory value constraints in UML
Mandatory value constraint in various languages
Example

Mandatory value constraints in UML

A mandatory value constraint requires that a property must have a value. This can be expressed in a UML class diagram with the help of a multiplicity constraint expression where the lower multiplicity is 1. For a single-valued property, this would result in the multiplicity expression 1..1, or the simplified expression 1, appended to the property name in brackets. For example, the following class diagram defines a mandatory value constraint for the property name:

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Introduction

The Foundations of Web Apps

Javascript Fundamentals

Building a Minimal Web App with Plain JS in Seven Steps

Integrity Constraints and Data Validation

Constraint Validation in Plain JS

Enumerations

Enumeration Attributes in Plain JS

Reference Properties and Unidirectional Associations

Implementing Unidirectional Functional Associations

Implementing Unidirectional Non-Functional Associations

Bidirectional Associations

Implementing Bidirectional Associations

Subtyping and Inheritance

Subtyping with Plain JS

Conclusion

Mandatory Value Constraints

Mandatory value constraints in UML