Sudoku.js

"use strict";

for(var i = 0; i < 9; i++){
	for(var k = 0; k < 9; k++){
		create_var(i, k);
	}
} // loops through the var declarations for each DIV

function create_var(arr_i, arr_k) {
	var x = "c"+arr_i+arr_k;
	return 'var "' + x + '" = document.getElementById("' + x + '")';
} // assembles the var declarations for each <div>

var puzzle_inc = "9..47.8.2..821..65.1...9.7...7.9.......8........5..2.9..91.......5.......2.94.5.6";
var puzzle_key = "936475812478213965512689473257394681694821357183567249349156728865732194721948536";

function assign_cell(flag, x, arr_a) {
	if(flag === 1) {
		x.innerHTML = puzzle_inc[arr_a];
	} else if(flag === 2) {
		x.innerHTML = null;
	} else {
		alert("Error in function assign_cell()");
	}
} // assembles the code for var assignment

var counter = (function() {
	var counter = -1;
	return function() {counter++; return counter}
})();

for(var i = 0; i < 9; i++){
	for(var k = 0; k < 9; k++){
		var a = counter();
		var x = "c"+i+k;
		if(puzzle_inc[a] != '.') {
			assign_cell(1, x, a);
		} else {
			assign_cell(2, x, a);
		}
	}
} // assign each character of 'puzzle' to one cell in the grid IF it is not '.'