JavaScript if-else

In JavaScript, an if-else statement is used to execute a block of code based on a condition. If the condition evaluates to true, the code inside the if block will run; otherwise, the code inside the else block will run.

Syntax:

if (condition) {
  // code to be executed if the condition is true
} else {
  // code to be executed if the condition is false
}

Example:

let age = 18;

if (age >= 18) {
  console.log("You are an adult.");
} else {
  console.log("You are a minor.");
}

Explanation:

• If the variable age is greater than or equal to 18, the message "You are an adult." will be logged to the console.
• Otherwise, the message "You are a minor." will be logged.

Optional else if:

You can chain multiple conditions using else if.

let age = 25;

if (age < 13) {
  console.log("You are a child.");
} else if (age >= 13 && age < 18) {
  console.log("You are a teenager.");
} else if (age >= 18 && age < 60) {
  console.log("You are an adult.");
} else {
  console.log("You are a senior.");
}

In this example:

• If age is less than 13, it prints "You are a child."
• If age is between 13 and 17, it prints "You are a teenager."
• If age is between 18 and 59, it prints "You are an adult."
• Otherwise, it prints "You are a senior."