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while vs do-while - Loops | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

Open in Course

while vs do-while

When to use each

Use while when you might not need to run at all:

while (hasMoreItems()) {
  processItem()
}

Use do-while when you must run at least once:

do {
  showMenu()
  choice = getChoice()
} while (choice !== "quit")

Most loops are while or for. Use do-while only when the "at least once" guarantee matters.