sample_fill() {
	const a = new Array(5);
	a.fill(8);
	prn(a);
	//[ 8, 8, 8, 8, 8 ]
}

sample_fillSequence() {
	const a = new Array(5);
	a.fill(0);
	//Use optional param "index"
	const sequence = a.map((each, index) => index + 1);
	prn(sequence);
	//[ 1, 2, 3, 4, 5 ]
}