Logical Operators

Sometimes we need to combine multiple conditions. For example, if it's Saturday or Sunday, it's the weekend. By using the word or, we combine two conditions. In code, we write this as: ||. Here's how we would implement this example in code:

let day = "Saturday";
if (day === "Saturday" || day === "Sunday") {
	console.log("It's the weekend");
}
// Prints: It's the weekend

Besides or ||, we have another logical operator that combines multiple conditions: and &&. For example, if it's Friday and the temperature is above 20°C, I will go outside:

let day = "Friday";
let temperature = 25;
if (day === "Friday" && temperature > 20) {
	console.log("I'm going outside");
}
// Prints: I'm going outside

We can combine these operators as many times as we need and use parentheses to determine precedence. For example:

let day = "Friday";
let temperature = 25;
if ((day === "Friday" || day === "Saturday" || day === "Sunday") && temperature > 20) {
	console.log("I'm going outside");
}
// Prints: I'm going outside