Prototypes Classes Inheritance and Function Methods
Continue your JavaScript Tutorial learning path with hands-on explanation, code practice, and quiz.
Course
JavaScript Tutorial
Estimated Time
8 min
Progress
27%
Track Position
20 / 73
Lesson Overview
Simple Explanation
JavaScript prototype-based language hai. Objects prototype chain se properties lookup karte hain. Classes syntactic sugar hain prototypes ke upar. bind/call/apply function context control karte hain.
Code Explanation
Inheritance base class behavior reuse karne deta hai. call/apply arguments pass style me farq dete hain.
Output Description
Console me inherited methods aur context binding ka result show hoga.
Practice Exercise
Apni Vehicle aur Car classes banao aur bind ke sath method detach karke run karo.
Extra Explanation
Why This Matters
Prototypes Classes Inheritance and Function Methods is core to dynamic behavior. Strong fundamentals here help you build forms, API flows, and interactive UI with confidence.
Real-World Workflow
Complex features are usually split into small functions, then verified through focused logging and tiny test cases.
Common Mistakes to Avoid
Avoid uncontrolled globals, weak error handling, and ignored async states. Define clear input-output expectations for each function.
Example + Live Practice
<script>
function Person(name) {
this.name = name;
}
Person.prototype.sayHi = function () {
return "Hi " + this.name;
};
class Student extends Person {
constructor(name, course) {
super(name);
this.course = course;
}
info() {
return this.name + " studies " + this.course;
}
}
const s = new Student("Ali", "JavaScript");
console.log(s.sayHi(), s.info());
const obj = { x: 10 };
function show(prefix) {
console.log(prefix, this.x);
}
show.call(obj, "call");
show.apply(obj, ["apply"]);
const bound = show.bind(obj, "bind");
bound();
</script>Try It Yourself
Test Your Knowledge
Quiz Coming Soon
Quiz for this lesson is not added yet.
Save Your Work
Lesson ke end par apna code save karein. Dashboard me aap kabhi bhi is saved code ko dobara dekh sakte hain.