Elucidate Solution (Node.js)

elucidate.js

var fs = require('fs');

var e = fs.readFileSync('elucidate.txt', 'utf8');

var gcd = function(a, b) {
    if ( ! b) {
        return a;
    }

    return gcd(b, a % b);
};

var gcdArray = function(nums) {
	var a = nums[0];
	for (var i=1; i < nums.length; i++) {
		a = gcd(a, nums[i]);
	}
	return a;
};

function lcm(n1,n2) {
	return n1*n2/gcd(n1,n2);
}

var lcmArray = function(nums) {
	var a = nums[0];
	for (var i=1; i < nums.length; i++) {
		a = a * nums[i];
	}
	return a / gcdArray(nums);
};

var lcmArray2 = function(nums) {
	var a = nums[0];
	for (var i=1; i < nums.length; i++) {
		a = lcm(a, nums[i]);
	}
	return a;
};

// var e = "(1,2,3),(4,5,6),(7,8,9)";
e = e.substring(1);
allNums = [];

e.split("(").forEach(function(t) {
	if (t[t.length-1] == ",") t = t.substring(0, t.length-1);
	t = t.replace(")", "").split(",");
	t = t.map(function(a){return +a;});
	var g = gcdArray(t);
	if (allNums.indexOf(g) == -1) {
		allNums.push(g);
	}
});

// console.log(lcmArray(q));
console.log(allNums);
console.log(lcmArray(allNums));
console.log(lcmArray2(allNums));