What are components and give an example?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of Vue.js conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
Components are reusable Vue instances with a name. They accept the same options as new Vue, such as data, computed,
watch, methods, and lifecycle hooks(except few root-specific options like el).
Lets take an example of counter component,
// Define a new component called button-counter
Vue.component('button-counter', {
template: '<button v-on:click="count++">You clicked me {{ count }} times.</button>'
data: function () {
return {
count: 0
}
},
})
Let's use this component inside a root Vue instance created with new Vue
<div id="app">
<button-counter></button-counter>
</div>
var vm = new Vue({ el: '#app' });
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Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.