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WithoutBook LIVE Mock Interviews ES6 Related interview subjects: 19

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Ques 1

Explain the 'WeakMap' and 'WeakSet' data structures in ES6.

WeakMap and WeakSet are similar to Map and Set, respectively, but they allow for garbage collection of keys and values that are not used elsewhere.

Example:

let weakMap = new WeakMap(); let obj = {}; weakMap.set(obj, 'some value');

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Ques 2

What is the 'Proxy' object in ES6?

The Proxy object is used to define custom behavior for fundamental operations (e.g., property lookup, assignment, enumeration, etc.).

Example:

const handler = { get: function(target, prop) { return prop in target ? target[prop] : 'Not found'; } }; const proxy = new Proxy({}, handler);

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Ques 3

Explain the concept of the 'Reflect' object in ES6.

The Reflect object provides methods for interceptable JavaScript operations. It is used for method invocation, property manipulation, etc.

Example:

Reflect.has(obj, 'property');

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