ES6 perguntas e respostas de entrevista
Pergunta 1. What is the let keyword used for in ES6?
The let keyword is used to declare block-scoped variables.
Example:
let x = 10; if (true) { let x = 20; console.log(x); } console.log(x);
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Pergunta 2. Explain the differences between let, const, and var.
let and const are block-scoped, while var is function-scoped. const is used for constants and cannot be reassigned.
Example:
const PI = 3.14; let x = 10; var y = 5;
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Pergunta 3. What are template literals in ES6?
Template literals are a way to create strings with embedded expressions. They are enclosed by backticks (`).
Example:
let name = 'John'; let greeting = `Hello, ${name}!`;
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Pergunta 4. Explain the arrow functions in ES6.
Arrow functions are a concise way to write functions. They do not have their own 'this' and 'arguments'.
Example:
const add = (a, b) => a + b;
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Pergunta 5. What is destructuring assignment in ES6?
Destructuring assignment allows you to extract values from arrays or objects and assign them to variables.
Example:
const person = { name: 'John', age: 30 }; const { name, age } = person;
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