How to use OR condition in a JavaScript IF statement?

In JavaScript, the OR condition in an if statement is written using the logical OR operator ||. This operator allows you to test multiple conditions at once and execute a block of code if at least one condition evaluates to true. It’s very useful when you want flexibility in decision-making without writing multiple separate if statements.

Here’s how it works:

Basic syntax:

 if (condition1 || condition2) {
    // code runs if either condition1 OR condition2 is true
}

• At least one true is enough: If the first condition is false but the second is true, the code inside the if block will still run.
  
• Short-circuiting: JavaScript stops evaluating as soon as it finds a true condition, making the code slightly more efficient.
  
• Multiple ORs: You can chain more than two conditions, e.g., (a || b || c).
  

Example:

let age = 20;
let hasPermission = true;
if (age >= 18 || hasPermission) {
  console.log("Access granted!");
} else {
  console.log("Access denied!");
}

Here, the message prints "Access granted!" because at least one condition is true.

Key points to remember:

• Use || when any one of the conditions should be enough to run the code.
  
• Combine it with && (AND) for more complex logic.
  
• Be careful with truthy and falsy values, as JavaScript may evaluate them differently than you expect.