Else If

if (condition1) {
  // Runs if condition1 is true
} else if (condition2) {
  // Runs if condition1 is false AND condition2 is true
} else if (condition3) {
  // Runs if condition1 and condition2 are false AND condition3 is true
} else {
  // Runs if all conditions are false
}
 // Example:
const score = 85
 if (score >= 90) {
  console.log('Grade: A')
} else if (score >= 80) {
  console.log('Grade: B')  // This runs
} else if (score >= 70) {
  console.log('Grade: C')
} else {
  console.log('Grade: F')
}

const score = 87
 if (score >= 90) {
  console.log('A - Excellent!')
} else if (score >= 80) {
  console.log('B - Great job!')  // This runs (87 >= 80)
} else if (score >= 70) {
  console.log('C - Good')
} else if (score >= 60) {
  console.log('D - Passed')
} else {
  console.log('F - Failed')
}
 // Only the B grade prints, even though 87 >= 70 and 87 >= 60

const score = 95
 if (score >= 60) {
  console.log('D - Passed')  // This runs, even though score is 95!
} else if (score >= 90) {
  console.log('A - Excellent!')  // Never reached
}
 // Bug! Should check highest scores first!

const temp = 85
 if (temp > 90) {
  console.log('It is very hot! Stay hydrated.')
} else if (temp > 75) {
  console.log('It is warm. Wear light clothes.')  // This runs
} else if (temp > 60) {
  console.log('It is nice. Enjoy the weather!')
} else if (temp > 40) {
  console.log('It is cool. Bring a jacket.')
} else {
  console.log('It is cold! Bundle up!')
}

const hour = 14  // 2 PM in 24-hour format
 if (hour < 12) {
  console.log('Good morning!')
} else if (hour < 18) {
  console.log('Good afternoon!')  // This runs (14 < 18)
} else {
  console.log('Good evening!')
}

const playerLevel = 25
 if (playerLevel >= 50) {
  console.log('Difficulty: HARD')
} else if (playerLevel >= 20) {
  console.log('Difficulty: MEDIUM')  // This runs
} else if (playerLevel >= 5) {
  console.log('Difficulty: EASY')
} else {
  console.log('Difficulty: TUTORIAL')
}

const userInput = 'yes'
 if (userInput === 'yes') {
  console.log('You agreed!')
} else if (userInput === 'no') {
  console.log('You declined')
} else if (userInput === 'maybe') {
  console.log('You are unsure')
} else {
  console.log('Invalid input')
}

const value = 42
 if (typeof value === 'string') {
  console.log('It is text')
} else if (typeof value === 'number') {
  console.log('It is a number')  // This runs
} else if (typeof value === 'boolean') {
  console.log('It is true or false')
} else {
  console.log('Unknown type')
}

const weight = 15  // pounds
 if (weight > 50) {
  console.log('Shipping: $50')
} else if (weight > 20) {
  console.log('Shipping: $20')
} else if (weight > 10) {
  console.log('Shipping: $10')  // This runs
} else {
  console.log('Shipping: $5')
}