How to Use Variables Effectively in Object-Oriented JavaScript?

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Here’s how to use variables effectively in object-oriented JavaScript:

  1. Declaration: Use const or let to declare variables instead of var. const is used for constants whose value should not be reassigned, while let is used for variables whose value may change.


const name = "John";
let age = 30;

// This will throw an error: name = "Jane";
age = 31;
  1. Naming Conventions: Follow a consistent naming convention, such as camelCase or snake_case. Avoid using names that are reserved words in JavaScript.


const firstName = "John";
const last_name = "Doe";
  1. Scoping: Variables declared with const and let are block-scoped, meaning they are only accessible within the block in which they are declared. Variables declared with var are function-scoped.


if (true) {
  const message = "Hello, World!";
  console.log(message); // "Hello, World!"
console.log(message); // ReferenceError: message is not defined
  1. Destructuring: Use destructuring to extract values from objects and arrays into separate variables.


const person = { name: "John", age: 30 };
const { name, age } = person;
console.log(name); // "John"
console.log(age); // 30
  1. Temporal Dead Zone (TDZ): Be aware of the TDZ when using let and const. The TDZ is the period of time between a variable’s declaration and its initialization during which the variable is not accessible.


console.log(message); // ReferenceError: message is not defined
let message = "Hello, World!";

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