Hands-On Design Patterns and Best Practices with Julia

Mutability

In some situations, we may actually want an object to be mutable. The immutability constraint can be removed easily by just adding the mutable keyword in front of the type definition. To make the Stock type mutable, we do the following:

mutable struct Stock <: Equity    symbol::String    name::Stringend

Now let's try to update the name field in a hypothetical case where Apple changes its company name:

The name field has been updated as we wish. Note that, when a type is declared mutable, all of its fields become mutable. So, in this case, we would be allowed to change the symbol as well. Depending on the situation, such behavior may or ...