JavaScript: While loops | Moriel's Mauni blog

Table of Contents

While

while: The while statement creates a loop that executes a specified statement as long as the test condition evaluates to true. The condition is evaluated before executing the statement.

while (somthing is true) {
	// Do somthing
}

Example:

var i = 1;
while (i <= 10) {
	console.log(i);
	i++
}

// Prints "1 2 3 4 5 6 7 8 9 10" and exits.

Challenge

Print the words of “99 bottles of beer on the wall”

99 bottles of beer on the wall, 99 bottles of beer.  
Take one down and pass it around, 98 bottles of beer on the wall.

// Starting point, 99
var i = 99;
// while i is bigger or is 0
while (i > 0) {
	// print first part with bigger number
	console.log(i + " bottles of beer on the wall, " + i + " bottles of beer.");
	i-- // reduce number by 1
	if (i === 0) {
	    console.log("No more bottles of beer on the wall, no more bottles of beer. \nGo to the store and buy some more, 99 bottles of beer on the wall.");
	if (i === 1) {
	    console.log("1 bottle of beer on the wall, 1 bottle of beer. \nTake one down and pass it around, no more bottles of beer on the wall.");
	}
	} else {
	// print the 2nd half
    console.log("Take one down and pass it around. " + i + " bottles of beer on the wall.");
	}

}