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const user = {
  name: 'Sarah',
  age: 25,
  getName() { return this.name; },
  getAge: () => this.age
};

const methods = {
  regular: user.getName,
  arrow: user.getAge
};

console.log(methods.regular());
console.log(methods.arrow());
console.log(user.getName());
console.log(user.getAge());

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▪️ Tags, Elements, Attributes 
▪️ Forms, Tables, Lists 
▪️ Semantic HTML

▪️ Selectors, Box Model 
▪️ Flexbox & Grid 
▪️ Media Queries (Responsive Design) 
▪️ CSS Animations & Transitions

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▪️ DOM Manipulation 
▪️ Events & Event Listeners 
▪️ ES6+ Features (let/const, arrow functions, destructuring)

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▪️ Breakpoints 
▪️ Viewport units & rem/em

▪️ React.js (most popular) 
▪️ Understanding Components, Props, State 
▪️ JSX & Hooks (useState, useEffect)

▪️ npm/yarn basics 
▪️ Install & use libraries (e.g., Axios, React Router) 
▪️ Basic bundlers (Webpack, Vite - optional)

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let obj1 = { name: 'Sarah' };
let obj2 = { name: 'Mike' };
let obj3 = { ref: obj1 };

obj1.circular = obj1;
obj2.partner = obj3;
obj3.partner = obj2;

let weakMap = new WeakMap();
weakMap.set(obj1, 'data1');
weakMap.set(obj2, 'data2');

obj1 = null;
obj2 = null;

console.log(weakMap.has(obj3.ref));
console.log(obj3.partner.name);