Javascript

Loop

for

var cars = ["BMW", "Volvo", "Saab", "Ford", "Fiat", "Audi"];

for(var i = 0; i < cars.length; i++)
	console.log(cars[i])

for/in

get the index of the array or object

var cars = ["BMW", "Volvo", "Saab", "Ford", "Fiat", "Audi"];

for (i in cars)
	console.log(cars[i]);

var person = {fname:"John", lname:"Doe", age:25};

for (i in person)
	console.log(i, person[i]);

for/of

get the element of the iterable such as Arrays, Strings, Maps, NodeLists, and more

var cars = ['BMW', 'Volvo', 'Mini'];

for (var i of cars)
	console.log(i);

var txt = 'JavaScript';

for (var x of txt) {
  	document.write(x + "
");
	}

while

var i = 0;

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

do/while

var i = 0;

do {
	console.log(i);
	i++;
}
while (i < 10);

break

var cars = ['BMW', 'Volvo', 'Mini'];

for (var i in cars)
{
	if (i == 1) break;
	console.log(i, cars[i]);
}

continue

var cars = ['BMW', 'Volvo', 'Mini'];

for (var i in cars)
{
	if (i == 1) continue;
	console.log(i, cars[i]);
}

Label

outloop:

for (let i = 0; i < 3; i++)
{
	innerloop:

	for (let j = 0; j < 3; j++)
	{
		console.log(i, j);
		if(i == 1) break innerloop;
		if(i == 2) break outloop;
	}
}

console.log("After loop ...");

outloop:

for (let i = 0; i < 3; i++)
{
	innerloop:

	for (let j = 0; j < 3; j++)
	{
		console.log(i, j);
		if(i == 1) break innerloop;
		if(i == 2) break outloop;
	}
}

console.log("After loop ...");