diff --git a/src/components/Cell.js b/src/components/Cell.js
index 918f971..af60f89 100644
--- a/src/components/Cell.js
+++ b/src/components/Cell.js
@@ -31,9 +31,15 @@ class CellStream extends Stream {
   get living() {
     return this.head.living;
   }
+  get liveNeighbors() {
+    return this.head.liveNeighbors;
+  }
   set liveNeighbors(liveNeighbors) {
     this.head.liveNeighbors = liveNeighbors;
   }
+  addLiveNeighbor() {
+    this.head.addLiveNeighbor();
+  }
 }
 
 const cellStream = (living = false, liveNeighbors = 0) => {
diff --git a/src/components/GameField.js b/src/components/GameField.js
index 204e54c..1e3133f 100644
--- a/src/components/GameField.js
+++ b/src/components/GameField.js
@@ -1,5 +1,5 @@
 const { cellStream } = require("./Cell");
-const { Stream } = require("../utils");
+const { Stream, getNeighbors } = require("../utils");
 
 class GameField {
   constructor({ fieldArray = [], fieldMap = {} }) {
@@ -8,7 +8,7 @@ class GameField {
     fieldArray.forEach((subArray, majorIndex) =>
       subArray.forEach((value, minorIndex) => {
         if (value > 0) {
-          this.map[`${majorIndex}-${minorIndex}`] = cellStream(true, 0);
+          this.map[`${majorIndex},${minorIndex}`] = cellStream(true, 0);
         }
       })
     );
@@ -27,18 +27,26 @@ class FieldStream extends Stream {
   get map() {
     return this.head.map;
   }
+  addLiveNeighbor(key) {
+    if (this.map[key] === undefined) {
+      this.map[key] = new cellStream(false);
+    }
+    this.map[key].addLiveNeighbor();
+  }
 }
 
 const fieldStream = ({ fieldArray, fieldMap }) => {
   return new FieldStream(new GameField({ fieldArray, fieldMap }), function () {
     // calculate liveNeighbors for all cells on first next call
-
-    new FieldStream({}, function () {
+    for (const key in this.map) {
+      getNeighbors(key).forEach((neighbor) => this.addLiveNeighbor(neighbor));
+    }
+    this.tail = function () {
       // call .next on all Cells on second next call
-    });
+    };
+    return this;
   });
 };
-
 // as a stream -> fieldStream => Stream(GameField, () => Stream(fieldStream.computeNeighbors(), () => Stream(fieldStream.setLiving()))
 
 // instantiate table (orientation of major and minor axis dependent on viewport)
diff --git a/src/test/GameField.test.js b/src/test/GameField.test.js
index c9e040b..c60ef44 100644
--- a/src/test/GameField.test.js
+++ b/src/test/GameField.test.js
@@ -1,23 +1,22 @@
 import { GameField, fieldStream } from "../components/GameField";
 
-const fieldArray = [
-  [0, 1, 0],
-  [1, 0, 1],
-];
-
-const fieldMap = {
-  "0-0": true,
-  "0-2": true,
-  "1-1": true,
-};
-
 describe("Game Field seeds living Cells with array", () => {
+  const fieldArray = [
+    [0, 1, 0],
+    [1, 0, 1],
+  ];
+
+  const fieldMap = {
+    "0,0": true,
+    "0,2": true,
+    "1,1": true,
+  };
   const gameArraySeed = new GameField({ fieldArray });
   const gameMapSeed = new GameField({ fieldMap });
   const streamArraySeed = fieldStream({ fieldArray });
   const streamMapSeed = fieldStream({ fieldMap });
 
-  ["0-1", "1-0", "1-2"].forEach((key) => {
+  ["0,1", "1,0", "1,2"].forEach((key) => {
     test(`Array seed: ${key} should equal living Cell`, () => {
       expect(gameArraySeed.map[key].living).toEqual(true);
     });
@@ -35,7 +34,7 @@ describe("Game Field seeds living Cells with array", () => {
     });
   });
 
-  ["0-0", "0-2", "1-1"].forEach((key) => {
+  ["0,0", "0,2", "1,1"].forEach((key) => {
     test(`Array seed: ${key} should equal undefined`, () => {
       expect(gameArraySeed.map[key]).toEqual(undefined);
     });
@@ -53,3 +52,103 @@ describe("Game Field seeds living Cells with array", () => {
     });
   });
 });
+
+describe("fieldStream.next calculates liveNeighbors", () => {
+  const fieldArray = [
+    [0, 1, 0],
+    [1, 0, 1],
+  ];
+  const testStream = fieldStream({ fieldArray });
+  [
+    ["-1,0", 1],
+    ["-1,1", 1],
+    ["-1,2", 1],
+    ["0,-1", 1],
+    ["0,0", 2],
+    ["0,1", 2],
+    ["0,2", 2],
+    ["0,3", 1],
+    ["1,-1", 1],
+    ["1,0", 1],
+    ["1,1", 3],
+    ["1,2", 1],
+    ["1,3", 1],
+    ["2,-1", 1],
+    ["2,0", 1],
+    ["2,1", 2],
+    ["2,2", 1],
+    ["2,3", 1],
+  ].forEach(([key, liveNeighbors]) => {
+    test(`after .next ${key} in 1st should have ${liveNeighbors} liveNeighbors`, () => {
+      expect(testStream.next.map[key].liveNeighbors).toEqual(liveNeighbors);
+    });
+  });
+
+  const fieldMap = {
+    "0,1": true,
+    "0,2": true,
+    "1,0": true,
+    "1,1": true,
+    "1,3": true,
+    "2,1": true,
+    "2,2": true,
+  };
+  const testStream2 = fieldStream({ fieldMap });
+  [
+    ["-1,0", 1],
+    ["-1,1", 2],
+    ["-1,2", 2],
+    ["-1,3", 1],
+    ["0,-1", 1],
+    ["0,0", 3],
+    ["0,1", 3],
+    ["0,2", 3],
+    ["0,3", 2],
+    ["0,4", 1],
+    ["1,-1", 1],
+    ["1,0", 3],
+    ["1,1", 5],
+    ["1,2", 6],
+    ["1,3", 2],
+    ["1,4", 1],
+    ["2,-1", 1],
+    ["2,0", 3],
+    ["2,1", 3],
+    ["2,2", 3],
+    ["2,3", 2],
+    ["2,4", 1],
+    ["3,0", 1],
+    ["3,1", 2],
+    ["3,2", 2],
+    ["3,3", 1],
+  ].forEach(([key, liveNeighbors]) => {
+    test(`after .next ${key} in 2nd should have ${liveNeighbors} liveNeighbors`, () => {
+      expect(testStream2.next.map[key].liveNeighbors).toEqual(liveNeighbors);
+    });
+  });
+});
+
+describe.skip("fieldStream.next tests still lifes", () => {
+  const blockArray = [
+    [1, 1],
+    [1, 1],
+  ];
+
+  streamBlock = fieldStream({ fieldArray: blockArray });
+  ["0,0", "0,1", "1,0", "1,1"].forEach((key) => {});
+
+  const beehiveMap = {
+    "0,1": true,
+    "0,2": true,
+    "1,0": true,
+    "1,3": true,
+    "2,1": true,
+    "2,2": true,
+  };
+
+  const boatArray = [
+    [1, 1, 0],
+    [1, 0, 1],
+    [0, 1, 0],
+  ];
+});
diff --git a/src/utils/index.js b/src/utils/index.js
index ea07440..e2cd2b6 100644
--- a/src/utils/index.js
+++ b/src/utils/index.js
@@ -13,6 +13,21 @@ class Stream {
   }
 }
 
+const getNeighbors = (key) => {
+  const [x, y] = key.split(",").map((str) => parseInt(str));
+  return [
+    [x - 1, y - 1],
+    [x - 1, y],
+    [x - 1, y + 1],
+    [x, y - 1],
+    [x, y + 1],
+    [x + 1, y - 1],
+    [x + 1, y],
+    [x + 1, y + 1],
+  ].map((arr) => arr.join(","));
+};
+
 module.exports = {
   Stream,
+  getNeighbors,
 };