Control flow · Lesson 11 of 45

switch and the ternary operator

Shorter alternatives for many choices or just two.

7 minutes3 games

The ternary is a one-line condition: condition ? ifTrue : ifFalse. Perfect for choosing between two values.

JavaScript

const stock = 0
const label = stock > 0 ? "In stock" : "Sold out"
console.log(label)

const items = 1
console.log(`${items} ${items === 1 ? "item" : "items"}`)

switch

switch compares one value against several options (using ===). Each case needs a break, or execution falls into the next case. default runs if nothing matched.

JavaScript

const day = "fri"
switch (day) {
  case "fri":
  case "sat":
    console.log("Weekend")
    break
  case "sun":
    console.log("Back to work")
    break
  default:
    console.log("Weekday")
}

fri and sat share code: a case without a break falls through on purpose.

What's the output?

const n = 2
switch (n) {
  case 1:
    console.log("one")
  case 2:
    console.log("two")
  case 3:
    console.log("three")
}

What will this code print?

Complete the code

Write the ternary: Pass for 50 or more, otherwise Fail.

const result = score >= 50  "Pass"  "Fail"

Exercise

Use a ternary to print even or odd for n.

Expected output: odd

JavaScript

const n = 7

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JavaScript

Control flow · Lesson 11 of 45

switch and the ternary operator

Shorter alternatives for many choices or just two.

7 minutes3 games

The ternary is a one-line condition: condition ? ifTrue : ifFalse. Perfect for choosing between two values.

JavaScript

const stock = 0
const label = stock > 0 ? "In stock" : "Sold out"
console.log(label)

const items = 1
console.log(`${items} ${items === 1 ? "item" : "items"}`)

switch

switch compares one value against several options (using ===). Each case needs a break, or execution falls into the next case. default runs if nothing matched.

JavaScript

const day = "fri"
switch (day) {
  case "fri":
  case "sat":
    console.log("Weekend")
    break
  case "sun":
    console.log("Back to work")
    break
  default:
    console.log("Weekday")
}

fri and sat share code: a case without a break falls through on purpose.

What's the output?

const n = 2
switch (n) {
  case 1:
    console.log("one")
  case 2:
    console.log("two")
  case 3:
    console.log("three")
}

What will this code print?

Complete the code

Write the ternary: Pass for 50 or more, otherwise Fail.

const result = score >= 50  "Pass"  "Fail"

Exercise

Use a ternary to print even or odd for n.

Expected output: odd

JavaScript

const n = 7

Learn more from

Played 0 of 3 games