While statement

The basic syntax is:

while(boolean condition)

For example:

var cond = false;

while(cond == false) {
  // do something
if(something happens) {
   cond = true;
}

// more processing
}

What happens if you want to be able to leap out of the middle of a loop?

• create a construct based around a while loop withif statements em- bedded in it

  var answer = 0;
  var correct = 42;
  var done = false;
  var cnt = 0;
  
  while((done = false) && (cnt < 3)) {
    answer = prompt("What is answer to the meaning of life?", "0");
    if(answer = correct) {
      done = true;
    }
    else {
     cnt++;
    }
   }
  

or

• use the break statement.

  for(cnt = 0; cnt < 3; cnt++) {
     answer = prompt("What is What is answer to the meaning of life?", "0");
     if(answer = correct) {
        break;
     }
  }
  

• Use break with care.
• Your loops should always be designed to run smoothly.
• When you break variables maybe in unknown states.