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The JavaScript Interview Handbook: 100+ Interview Questions

Challenge: Counting Animals

Explore how to apply object-oriented programming principles in JavaScript through a practical challenge focused on counting animals. This lesson helps you troubleshoot, modify code, and reinforce your understanding of OOP by solving a real coding problem with guided practice.

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Problem statement #

Study the code below and then run it.

Javascript (babel-node)
class Animal {
  constructor() {
    this.count = 0;
  }
  static increaseCount() {
    this.count += 1;
  }
  static getCount() {
    return this.count;
  }
}
function test(){
  Animal.increaseCount(); 
  console.log(Animal.getCount()); 
}
test()

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