Comparison Operators

// Checks value AND type
console.log(5 === 5)        // true (same value, same type)
console.log(5 === '5')      // false (different types)
console.log('hi' === 'hi')  // true
console.log(true === true)  // true
console.log(true === 1)     // false (different types)

// Converts types before comparing (confusing!)
console.log(5 == '5')       // true (converts '5' to number)
console.log(true == 1)      // true (converts true to 1)
console.log(false == 0)     // true (converts false to 0)
console.log('' == 0)        // true (weird!)
 // This can lead to bugs, so use === instead!

const score = 85
 console.log(score > 80)   // true (85 is greater than 80)
console.log(score > 100)  // false (85 is not greater than 100)
console.log(score < 90)   // true (85 is less than 90)
console.log(score < 50)   // false (85 is not less than 50)

const age = 18
 console.log(age >= 18)  // true (18 equals 18)
console.log(age >= 21)  // false (18 is less than 21)
console.log(age <= 18)  // true (18 equals 18)
console.log(age <= 16)  // false (18 is greater than 16)
 // >= means 'greater than OR equal to'
// <= means 'less than OR equal to'

const temperature = 75
 if (temperature > 80) {
  console.log('It is hot!')
}
 if (temperature >= 70) {
  console.log('It is warm!')  // This runs
}
 if (temperature < 60) {
  console.log('It is cold!')
}

const score = 87
 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 password = 'secret123'
const confirmPassword = 'secret123'
 if (password === confirmPassword) {
  console.log('Passwords match!')  // This runs
}
 if (password.length >= 8) {
  console.log('Password is strong enough')
}

const itemCount = 5
const total = 150
 if (itemCount > 3) {
  console.log('Bulk discount applied!')
}
 if (total >= 100) {
  console.log('Free shipping!')
}
 if (total < 50) {
  console.log('Add $' + (50 - total) + ' for free shipping')
}

const playerLevel = 25
const bossLevel = 30
 if (playerLevel >= bossLevel) {
  console.log('You can fight the boss!')
} else {
  console.log('Level up ' + (bossLevel - playerLevel) + ' more times')
}
 if (playerLevel !== 25) {
  console.log('Not level 25')
} else {
  console.log('You are level 25!')  // This runs
}