Implementing mutable objects

Sourcery can also help generate a fully mutable class for your object using AutoMutable.stencil, as follows:

{% for type in types.implementing.AutoMutable %}
class Mutable{{ type.name }} {
    {% for member in type.variables %}
    var {{ member.name }}: {{member.typeName}}
    {% endfor %}

    init(
        {% map type.variables into vars using var %}
        {{ var.name }}: {{ var.typeName }}{% endmap %}
        {{ vars|join:"," }}) {
        {% for member in type.variables %}
        self.{{ member.name }} = {{member.name}}
        {% endfor %}
     }
}
{% endfor %}

This stencil will not replicate all instances and class methods—it will only generate a Mutable copy of a plain object.