How do you communicate between components?
Instruction: Describe the methods used for parent-child and sibling components communication in Vue.js.
Context: This question evaluates the candidate's ability to understand and implement communication patterns between components, a fundamental concept in Vue.js for building complex applications.
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For parent-to-child data, pass declared props. The child treats those inputs as read-only and emits an event when it wants the owner to change them. Object/array props can contain shared mutable references; one-way props do not deep-clone those objects.
For child-to-parent notifications, declare and emit a component event and let the parent listen. Component events do not bubble through arbitrary ancestors like DOM events. An intermediate component can explicitly forward an event or expose another contract...