Range Constraints
Explore how to implement range constraints in front-end applications to validate data types and values. Understand defining custom data types and writing check functions that prevent invalid inputs like empty strings or inappropriate numbers. This lesson helps you build more reliable and robust JavaScript apps by enforcing meaningful data ranges.
We'll cover the following...
A range constraint requires that a property must have a value in the value space of the type that has been defined as its range. This is implicitly expressed by defining a type for a property as its range. For instance, the attribute age defined for the object type Person in the class diagram below has the range Integer, so it must not have a value like "aaa", which is not an integer.
However, it may have values like -13 or 321 ...