1diff --git a/README.md b/README.md
  2index 2c58574..08c560b 100644
  3--- a/README.md
  4+++ b/README.md
  5@@ -8,4 +8,12 @@ Things I should do.
  6 
  7 ### `setValue()`, `getValue()` on a sheet
  8 
  9-## `load()` array of array of values for a sheet
 10+### Remove A1CellKey. It is unnecessary.
 11+
 12+### Write documentation for A1CellKey
 13+
 14+### Write documentation for Cell
 15+
 16+### Write documentation for Sheet
 17+
 18+### Write documentation for Matrix
 19\ No newline at end of file
 20diff --git a/src/Main.ts b/src/Main.ts
 21index c8b141b..9aa00fa 100644
 22--- a/src/Main.ts
 23+++ b/src/Main.ts
 24@@ -1,5 +1,13 @@
 25 import { Sheet } from "./Sheet"
 26 
 27+var input = [
 28+  [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, "SUM(A1:D1, H1)"],
 29+  [-1, -10, 2, 4, 100, 1, 50, 20, 200, -100, "MAX(A2:J2)"],
 30+  [-1, -40, -53, 1, 10, 30, 10, 301, -1, -20, "MIN(A3:J3)"],
 31+  [20, 50, 100, 20, 1, 5, 15, 25, 45, 23, "AVERAGE(A4:J4)"],
 32+  [0, 10, 1, 10, 2, 10, 3, 10, 4, 10, "SUMIF(A5:J5,'>5')"],
 33+  [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "SUM(K1, K2, K3, K4)"]
 34+];
 35 var sheet = new Sheet();
 36-sheet.load();
 37+sheet.load(input);
 38 console.log(sheet.toString());
 39diff --git a/src/Sheet.ts b/src/Sheet.ts
 40index 139931f..313f340 100644
 41--- a/src/Sheet.ts
 42+++ b/src/Sheet.ts
 43@@ -530,18 +530,18 @@ var Sheet = (function () {
 44   };
 45 
 46   var setCell = function (cellKeyString: string, value: string) {
 47-    instance.matrix.setCell(cellKeyString, value);
 48+    instance.matrix.setCell(cellKeyString, value.toString());
 49   };
 50 
 51-  this.load = function () {
 52-    var input = [
 53-      [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, "SUM(A1:D1, H1)"],
 54-      [-1, -10, 2, 4, 100, 1, 50, 20, 200, -100, "MAX(A2:J2)"],
 55-      [-1, -40, -53, 1, 10, 30, 10, 301, -1, -20, "MIN(A3:J3)"],
 56-      [20, 50, 100, 20, 1, 5, 15, 25, 45, 23, "AVERAGE(A4:J4)"],
 57-      [0, 10, 1, 10, 2, 10, 3, 10, 4, 10, "SUMIF(A5:J5,'>5')"],
 58-      [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "SUM(K1, K2, K3, K4)"]
 59-    ];
 60+  var getCell = function (cellKeyString: string) : Cell {
 61+    var cell = instance.matrix.getItem(new A1CellKey(cellKeyString));
 62+    if (cell === undefined) {
 63+      return null;
 64+    }
 65+    return cell;
 66+  };
 67+
 68+  this.load = function (input: Array<Array<any>>) {
 69     for (var y = 0; y < input.length; y++) {
 70       for (var x = 0; x < input[0].length; x++) {
 71         // set the cell here
 72@@ -565,6 +565,7 @@ var Sheet = (function () {
 73   this.helper = helper;
 74   this.parse = parse;
 75   this.setCell = setCell;
 76+  this.getCell = getCell;
 77 });
 78 
 79 export {
 80diff --git a/tests/SheetTest.ts b/tests/SheetTest.ts
 81new file mode 100644
 82index 0000000..b802c97
 83--- /dev/null
 84+++ b/tests/SheetTest.ts
 85@@ -0,0 +1,16 @@
 86+import { Sheet } from "../src/Sheet"
 87+import { assertEquals } from "./utils/Asserts"
 88+
 89+// Test setCell, getCell, valid
 90+var sheet = new Sheet();
 91+sheet.setCell("A2", "22");
 92+var cell = sheet.getCell("A2");
 93+assertEquals("22", cell.formula);
 94+assertEquals(22, cell.value);
 95+assertEquals("A2", cell.id);
 96+assertEquals(1, cell.row);
 97+assertEquals(0, cell.col);
 98+
 99+// Test getCell, null value
100+var nullCell = sheet.getCell("N1");
101+assertEquals(null, nullCell);