[Unsolved] Bug Record in Codecademy.com

var i=0;do{   i++;   console.log("Looped thrice!");   }while(i<3);

Looped thrice!Looped thrice!Looped thrice!

The console above meets my expectation.

But the underneath one doesn't.

var k=0;do{    console.log("Looped thrice!");   k++;   }while(k<3);

Looped thrice!Looped thrice!Looped thrice!2