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Mastering Logical Expressions in JavaScript: A Beginner’s Guide to Efficient Decision Making

Max N 47

Welcome to the world of JavaScript, where logical expressions play a crucial role in decision making. In this article, we will explore the three fundamental logical operators: AND, OR, and NOT.

By understanding how these operators work, you’ll be equipped to write more efficient and powerful code. Let’s dive in!

The Logical AND Operator

The Logical AND operator (&&) is used to combine two or more conditions. It returns true only if all the conditions evaluate to true. If any of the conditions are false, the AND operator will return false.

This operator is particularly useful when you need to ensure that multiple conditions are met before executing a block of code.

Example:

const age = 25;
const hasExperience = true;

if (age >= 18 && hasExperience) {
console.log("You are eligible to apply for this job.");
} else {
console.log("Sorry, you do not meet the requirements.");
}

In this example, the code checks if the age is greater than or equal to 18 and if the applicant has relevant experience. Only if both conditions are true, the message “You are eligible to apply for this job” will be displayed.

The Logical OR Operator

The Logical OR operator (||) is used to combine two or more conditions. It returns true if at least one of the conditions evaluates to true. If all the conditions are false, the OR operator will return false.

This operator is handy when you want to execute a block of code if any of the conditions are satisfied.

Example:

const temperature = 28;
const isRaining = true;

if (temperature > 30 || isRaining) {
console.log("It's a good day to stay indoors.");
} else {
console.log("Let's go outside and enjoy the weather!");
}

In this example, the code checks if the temperature is greater than 30 degrees Celsius or if it’s raining. If either condition is true, the message “It’s a good day to…