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JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops Review while loops, do...while loops, and Loop Conditions

dont get it

in a previous question to this quiz the while loop didn't run because the condition was (false), i thought it had to be (true) to run. But in this example it runs when (false)??

2 Answers

Steven Parker
Steven Parker
231,275 Points

The difference between a "while" and a "do...while" is that in a "do...while", the code runs first, and then the condition is tested to see if should repeat. So even when the condition is already false, the code block will run one time.

I am not sure which question you are referring to, since it doesn't tell you in the creation of a question. I can only assume it's this one?

Given the code below, what will print out to the console?

do {
  console.log('Hello');
} while (false)
console.log('Goodbye');

If so, this runs because in a do...while statement, the do always runs at least once before it checks the while statement. Had the while statement been true, it would run until the while statement became false due to a conditional statement in the while loop, or run Infinitely.

Is that the question? If not, please provide the question...