Countdown Liftoff

/*
 * Programming Quiz: Countdown, Liftoff! (4-3)
 * 
 * Using a while loop, print out the countdown output above.
 */

// your code goes here
var seconds = 60;

while ( seconds > -1 ) {
    if ( seconds === 50 ) {
        console.log("Orbiter transfers from ground to internal power");
    } else if ( seconds === 31 ) {
        console.log("Ground launch sequencer is go for auto sequence start");
    } else if ( seconds === 16 ) {
        console.log("Activate launch pad sound suppression system");
    } else if ( seconds === 10 ) {
        console.log("Activate main engine hydrogen burnoff system");
    } else if ( seconds === 6 ) {
        console.log("Main engine start");
    } else if ( seconds === 0 ) {
        console.log("Solid rocket booster ignition and liftoff!");
    } else {
        console.log("T-" + seconds + " seconds");
    }
    seconds--;
}