add tasks starting with a number

Task/24-game/JavaScript/24-game.js

@@ -0,0 +1,48 @@
+String.prototype.replaceAll = function(patt,repl) { var that = this;
+              	                                    that     = that.replace(patt,repl);
+						    if (that.search(patt) != -1) {
+							that = that.replaceAll(patt,repl);
+						    }
+						    return that;
+						  };
+
+function validChars(input) { var regInvalidChar = /[^\d\+\*\/\s-\(\)]/;
+                             return input.search(regInvalidChar) == -1;
+                           }
+
+function validNums(str, nums) {
+    var arr, l;
+    arr = str.replaceAll(/[^\d\s]/," ").replaceAll("  "," ").trim().split(" ").sort();
+    l   = arr.length;
+
+    while(l--) { arr[l] = Number(arr[l]); }
+
+    return _.isEqual(arr,nums.sort());
+}
+
+function validEval(input) { try { eval(input); } catch (e) { return false; };
+			    return true;
+			  }
+
+var input;
+
+while(true){ var numbers = [];
+             var i = 4;
+             while(i--) { numbers.push(Math.floor(Math.random()*8+1));
+                        }
+
+             input = prompt("Your numbers are:\n"
+                           + numbers.join(" ")
+                           + "\nEnter expression. (use only + - * / and parens).\n"
+                           + "'x' to exit."
+                           );
+
+             if (input === 'x') break;
+
+               !validChars(input)                 ? alert("Invalid chars used, try again. Use only:\n + - * / ( )")
+             : !validNums(input,numbers)          ? alert("Wrong numbers used, try again.")
+	     : !validEval(input)                  ? alert("Could not evaluate input, try again.")
+             : eval(input) != 24                  ? alert("Wrong answer:" + eval(input) + "\nTry again.")
+             : alert(input + "== 24. Congrats!!")
+             ;
+           }