JavaScript Code Explanation

Code Explanation

The provided code snippet contains a small error that prevents it from running correctly. Let's break it down step-by-step and correct the mistake.

Original Code

const $test = 111;
constole.log($test);

Error

There is a typo in the console.log statement. It is written as constole.log instead of console.log.

Corrected Code

const $test = 111;
console.log($test);

Explanation

const $test = 111;

• const: This keyword is used to declare a constant variable. A constant variable means that the value assigned to $test cannot be changed after its initial assignment.
• $test: This is the variable name. In JavaScript, variable names can include letters, digits, underscores (_), and dollar signs ($). It is common to prefix variable names with $ to indicate certain types of data or to avoid conflicts with reserved words.
• = 111: This is the assignment operator. It assigns the value 111 to the variable $test.

console.log($test);

• console.log: This is a function in JavaScript that outputs messages to the web console. It is commonly used for debugging purposes.
• $test: This is the constant variable we declared earlier. When passed to console.log(), it outputs the value 111.

Output

When the corrected code is run, the following output will be displayed in the console:

111

Summary

• Variable Declaration: The const keyword is used to declare a constant variable named $test with a value of 111.
• Output Statement: console.log($test) outputs the value of $test to the console.

Additional Examples

Example 1: Declaring Multiple Constants

const myNumber = 10;
const myString = "Hello World!";
const myBoolean = true;

console.log(myNumber);  // Output: 10
console.log(myString);  // Output: Hello World!
console.log(myBoolean); // Output: true

Example 2: Using Variables in Expressions

const a = 5;
const b = 10;
const sum = a + b;

console.log(sum); // Output: 15

Example 3: Understanding Scope

const myVar = "global";

if (true) {
  const myVar = "local";
  console.log(myVar); // Output: local
}

console.log(myVar); // Output: global

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