diff --git a/README.md b/README.md
index cc7118f..1860089 100755
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@
 ### Add Calculation Tests
 * subtracts 4 from 5 to equal 1
 * multiply 4 by 5 to equal 20
-* device 100 by 4 to equal 25
+* divide 100 by 4 to equal 25
 
 ### Add Function Tests
 * Implement the tests as described in the comments
@@ -48,13 +48,10 @@
 ### Hopefully at this point you can see there is a pattern to making the tests
 
 ### ChangeTemperatureContainer.js
-* Create a test file for this container to ensure that when the text box changes, the state currentTemp changes 
+* Create a test file for this container to ensure that when the text box changes, the state currentTemp changes
 
 ### CityDropDownContainer.js
 * Create a test file to ensure that when the drop down changes, the state currentCity changes
 
 ### CurrentCityContainer.js
 * Create a test file to ensure that when the state currentCity is change, the text of the div changes to “CurrentCity: whatever city”
-
-
-
diff --git a/src/services/array-functions.js b/src/services/array-functions.js
index ff781d2..3444d6d 100644
--- a/src/services/array-functions.js
+++ b/src/services/array-functions.js
@@ -1,40 +1,54 @@
 
 //in the function map, create a new array and store in a variable
-//loop theArray and call the fnc for each thing in the array, 
+//loop theArray and call the fnc for each thing in the array,
 //     passing in the item from the current loop into the call to fnc
 //add the returned value from fnc to the new array
 //return the new array
 export function map(theArray, fnc){
-
+  let newArray = [];
+  theArray.forEach((index) => {
+    newArray.push(fnc(index));
+  })
+  return newArray;
 }
 
 //create a new array
-//loop theArray and call the fnc for each thing in the array, 
+//loop theArray and call the fnc for each thing in the array,
 //     passing in the item from the current loop
 //fnc will return true or false, if true add the item to the new array else do not
 //return the new array
 export function filter(theArray, fnc){
-
+  let newArray = [];
+  theArray.forEach((item)=> {
+    if(fnc(item)) {
+      newArray.push(item);
+    }
+  })
+  return newArray;
 }
 
 
-//loop theArray and call the fnc for each thing in the array, 
+//loop theArray and call the fnc for each thing in the array,
 //     passing in the item from the current loop
-//fnc will return true or false, if true return the item 
+//fnc will return true or false, if true return the item
 //return null
 export function find(theArray, fnc){
-
+  for(let i = 0; i < theArray.length; i++) {
+    if (fnc(theArray[i])){
+      return theArray[i];
+    }
+  }
 }
 
 
 //return the last item in theArray
 export function findLast(theArray){
-
+  return theArray[theArray.length - 1];
 }
 
 //return the first element of the array
 export function head(theArray){
-
+  return theArray[0];
 }
 
 //create a new array
@@ -42,7 +56,11 @@ export function head(theArray){
 //add the item from each loop to the new array
 //return the new array
 export function reverse(theArray){
-
+  let tempArray = [];
+  for (var i = theArray.length - 1 ; i >= 0; i--) {
+    tempArray.push(theArray[i]);
+  }
+  return tempArray;
 }
 
 //create a new array
@@ -50,7 +68,11 @@ export function reverse(theArray){
 //add the item from each loop to the new array except the first item
 //return the new array
 export function tail(theArray){
-
+  let tempArray = [];
+  for (var i = 1; i < theArray.length; i++) {
+    tempArray.push(theArray[i]);
+  }
+  return tempArray;
 }
 
 //implement the most basic sorting algorithm there is
@@ -64,5 +86,18 @@ export function tail(theArray){
 //after each for loop check the variable, if true, continue the while loop
 //if false return theArray
 export function sort(theArray){
-
-}
\ No newline at end of file
+  let newArray = theArray;
+  let swapped;
+  do {
+    swapped = false;
+    for (var i = 0; i < newArray.length; i++) {
+      if (newArray[i] > newArray[i + 1]) {
+        let temp = newArray[i];
+        newArray[i] = newArray[i + 1];
+        newArray[i + 1] = temp;
+        swapped = true;
+      }
+    }
+  } while (swapped === true)
+  return newArray;
+}
diff --git a/src/services/calculations.js b/src/services/calculations.js
index 754df7c..24fed80 100644
--- a/src/services/calculations.js
+++ b/src/services/calculations.js
@@ -4,9 +4,9 @@ export function add(num1, num2){
 export function subtract(num1, num2){
   return num1 - num2;
 }
-export function multiple(num1, num2){
+export function multiply(num1, num2){
   return num1 * num2;
 }
 export function divide(num1, num2){
   return num1 / num2;
-}
\ No newline at end of file
+}
diff --git a/src/tests/array-functions.test.js b/src/tests/array-functions.test.js
index 57ec72f..0db3799 100644
--- a/src/tests/array-functions.test.js
+++ b/src/tests/array-functions.test.js
@@ -1,4 +1,4 @@
-import {map,filter,find,findLast} from "../services/array-functions";
+import {head,map,sort,filter,find,findLast,tail,reverse} from "../services/array-functions";
 const names = ["Jon","Bob","Ted","Barney","Lilly","Robin","Saul","Axe"];
 const myNumbers = [4,3,55,22,99,1913,7,5,4,2,1];
 
@@ -34,24 +34,71 @@ describe("map", () => {
   });
 });
 
+
 describe("sort", () => {
   it("should return an array with numbers in order", () => {
     expect(sort(myNumbers)).toEqual([
-      1,2,3,4,5,7,22,55,99,1913
+      1,2,3,4,4,5,7,22,55,99,1913
     ]);
   });
 });
 
 //filter should return an array with names of length 3
 //["Jon","Bob","Ted","Axe"]
+describe("filter", () => {
+  it("should return names with three letters", () => {
+    expect(filter(names,findThree)).toEqual([
+      "Jon",
+      "Bob",
+      "Ted",
+      "Axe"
+    ]);
+  });
+});
 
 //find should find one name of "Barney"
+describe("find", () => {
+  it("should find one name of 'Barney'", () => {
+    expect(find(names, findBarney)).toEqual("Barney");
+  });
+});
 
 //findLast should find the last name of "Axe"
+describe("findLast", () => {
+  it("should return the last element of an array 'Axe'", () => {
+    expect(findLast(names)).toEqual("Axe");
+  });
+});
 
 //reverse should return an array with the elements in the opposite order
 //["Axe","Saul","Robin","Lilly","Barney","Ted","Bob","Jon"]
+describe("reverse", () => {
+  it("should return an array with the elements in the opposite order", () => {
+    expect(reverse(names)).toEqual([
+      "Axe",
+      "Saul",
+      "Robin",
+      "Lilly",
+      "Barney",
+      "Ted",
+      "Bob",
+      "Jon"
+    ]);
+  });
+});
+
 //tail should return all elements in an array except the first one
 //[Bob","Ted","Barney","Lilly","Robin","Saul","Axe"];
-
-
+describe("tail", () => {
+  it("should return all elements in an array except the first one", () => {
+    expect(tail(names)).toEqual([
+      "Bob",
+      "Ted",
+      "Barney",
+      "Lilly",
+      "Robin",
+      "Saul",
+      "Axe"
+    ]);
+  });
+});
diff --git a/src/tests/calculations.test.js b/src/tests/calculations.test.js
index 409e055..f863813 100644
--- a/src/tests/calculations.test.js
+++ b/src/tests/calculations.test.js
@@ -5,3 +5,21 @@ describe("add", () => {
     expect(add(1, 2)).toBe(3);
   });
 });
+
+describe("multiply", () => {
+  it("should multiply 2 and 3 and return 6", () => {
+    expect(multiply(2,3)).toBe(6);
+  });
+})
+
+describe("subract", () => {
+  it("should subtract 1 from 3 and return 2", () => {
+    expect(subtract(3,1)).toBe(2);
+  });
+})
+
+describe("divide", () => {
+  it("should divide 6 by 3 and return 2", () => {
+    expect(divide(6,3)).toBe(2);
+  });
+})