Replace spaces, validate string

.gitignore

@@ -1 +1,4 @@
-node_modules/
+*.swp
+*~
+*.log
+node_modules

index.js

@@ -24,15 +24,20 @@ global.sameBlock = function(i, j) {
 sudokuSolver.solve = function (options) {
 
     // Expect at least one problem
-    options.problem = options.problem || 0;
+    var problem = options.problem;
+
+    // Replace spaces with nothing
+    if (problem && problem.constructor == String) {
+        problem = problem.replace (/ /g, "");
+    }
 
     // Verify if we get a problem
-    if (options.problem == 0) {
-        console.log("I need a problem");
-    } else if (options.problem.length != 81) {
+    if (!problem || problem.constructor !== String) {
+        console.log("Problem mubst be a nonempty string.");
+    } else if (problem.length != 81) {
         console.log("A valid sudoku problem should have a length of 81");
     } else {
-        solver(options.problem);
+        solver(problem);
     }
 
     // This is called to solve our game

test/1.js

@@ -2,5 +2,13 @@ var SudokuSolver = require("../index");
 
 SudokuSolver.solve({
     // Problem from: http://projecteuler.net/index.php?section=problems&id=96
-    problem: '003020600900305001001806400008102900700000008006708200002609500800203009005010300'
+    problem: '0 0 3 0 2 0 6 0 0'
+           + '9 0 0 3 0 5 0 0 1'
+           + '0 0 1 8 0 6 4 0 0'
+           + '0 0 8 1 0 2 9 0 0'
+           + '7 0 0 0 0 0 0 0 8'
+           + '0 0 6 7 0 8 2 0 0'
+           + '0 0 2 6 0 9 5 0 0'
+           + '8 0 0 2 0 3 0 0 9'
+           + '0 0 5 0 1 0 3 0 0'
 });