Question 1

How do I use arrow functions in JavaScript?

Accepted Answer

Arrow functions provide a concise syntax with lexical 'this' binding. Use `=>` for single expressions or blocks, like `const add = (a, b) => a + b`. They're ideal for callbacks and avoiding 'this' context issues in methods.

Question 2

What's the difference between let and const in ES6?

Accepted Answer

Both are block-scoped, but 'let' allows reassignment while 'const' is for single-assignment variables. Use 'const' by default for immutable references, and 'let' when values need to change, improving code predictability.

Question 3

ES6 modules vs CommonJS: which one should I use?

Accepted Answer

ES6 modules are native with static imports/exports, ideal for modern browsers and build tools. CommonJS is dynamic and used in Node.js. Choose ES6 for new projects with transpilation, or CommonJS for Node.js without bundlers.

Question 4

How to polyfill ES6 features for older browsers?

Accepted Answer

Use a tool like Babel to transpile ES6 code to ES5, and include polyfill libraries (e.g., core-js) for new APIs like Promise or Map. This ensures compatibility in environments lacking native ES6 support.

Question 5

When should I use generators in real projects?

Accepted Answer

Generators are useful for lazy iteration, such as processing streams or implementing custom iterators. They can also manage async flows, though async/await (ES2017) is now preferred for most asynchronous code.

es6features

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