JS Bin// source http://jsbin.com/safufareqo

sample-selector.js

var POPULATION_SIZE = 10;
var SAMPLE_SIZE = 5;

var nums = [];

function getRandomInt(min, max) {
	min = Math.ceil(min);
	max = Math.floor(max);
	return Math.floor(Math.random() * (max - min)) + min;
	// the maximum is exclusive and the minimum is inclusive
}

function inArray(num, arr) {
	for (let item of arr) {
		if (num == item) {
			return true;
		}
	}
	return false;
}

while (nums.length < SAMPLE_SIZE) {
	var option = getRandomInt(1, POPULATION_SIZE);
	if (!inArray(option, nums)) {
		nums.push(option);
	}
}

// sort numerically
nums.sort(function(a, b) {
	return a - b;
});

console.log(nums);