How does a do...while loop log to the console?

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#1

So, I am currently learning the do…while loops. (Exercise: https://www.codecademy.com/courses/introduction-to-javascript/lessons/loops/exercises/do-while-statement)
This is my code:

let cupsOfSugarNeeded = 3;

let cupsAdded = 0;

do {

  cupsAdded++;

  console.log(cupsAdded); 

} while (cupsAdded < cupsOfSugarNeeded) {

}

The problem is that when I add console.log to the “do” part of the loop it prints 1, 2 and 3 as it should. But when I put it in the “while” part, it just prints 3. Shouldn’t it print 1, 2 and 3 as well?

#2

I think when you put the console.log in the do…while loop it will loop until cupsAdded<cupsOfSugarNeeded becomes false. So it prints 3 times.

When you put the console.log at the end of the while it’s not part of the loop thus you end up with just the ending value of the loop.

#3
const cupsOfSugarNeeded = 3; let cupsAdded = 0; do { cupsAdded++; console.log(`I've added ${cupsAdded} cups of sugar so far.`) } while (cupsAdded < cupsOfSugarNeeded){ console.log("Hello."); console.log("The code in this block runs independently from the loop.\nThe looped code is inside the 'do' block.\nPutting curly braces around this code is inconsequential\nunless you define a block scoped variable inside the block.\nThe variable won't be accessible outside of the block."); } { console.log("Same with this block."); const blah = 10; } //Uncommenting the next line will throw a reference error since blah is not defined in this scope //console.log(blah);
#4 
while (cupsAdded < cupsOfSugarNeeded) {
  // this code block is not part of the loop
}

The correct syntax is,

do {
    // code
} while (condition)

We can write any code we like inside a freestanding code block, with zero effect.

{
    console.log("this will log; the statement is inline code")
}
// same as

console.log("this will log; the statement is inline code")
#5

Thank you all so much for your help. I got it now :slight_smile:

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