Jordon Reese

src/services/array-functions.js

@@ -1,29 +1,50 @@
 
 //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){
-
+  const newArr = [];
+  for (let i=0; i<theArray.length; i++) {
+    const curr = theArray[i];
+    const returned = fnc(curr);
+    newArr.push(returned);
+  }
+  return newArr;
 }
 
 //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){
-
+  const newArr = [];
+  for (let i = 0; i < theArray.length; i++) {
+    const curr = theArray[i];
+    const returned = fnc(curr);
+    if(returned){
+      newArr.push(theArray[i]);
+    }
+  }
+  return newArr;
 }
 
 
-//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++) {
+    const curr = theArray[i];
+    const returned = fnc(curr);
+    if(returned){
+      return theArray[i];
+    }
+  }
+  return null;
 }
 
 
@@ -65,4 +86,4 @@ export function tail(theArray){
 //if false return theArray
 export function sort(theArray){
 
-}
+}

src/tests/array-functions.test.js

@@ -44,14 +44,26 @@ describe("sort", () => {
 
 //filter should return an array with names of length 3
 //["Jon","Bob","Ted","Axe"]
+describe("filter", () => {
+  it("should return an array with names of length 3", () => {
+    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"
 
 //reverse should return an array with the elements in the opposite order
 //["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"];
-
-

src/tests/calculations.test.js

@@ -1,7 +1,26 @@
-import {add, subtract, multiply,divide} from "../services/calculations";
+import {add, subtract, multiple,divide} from "../services/calculations";
 
 describe("add", () => {
   it("should add 1 and 2 and return 3", () => {
     expect(add(1, 2)).toBe(3);
   });
 });
+
+
+describe("subtract", () => {
+  it("should subtract 2 from 3 and return 1", () => {
+    expect(subtract(3,2)).toBe(1);
+  });
+});
+
+describe("multiply", () => {
+  it("should multiply 2 and 2 and return 4", () => {
+    expect(multiple(2,2)).toBe(4);
+  });
+});
+
+describe("divide", () => {
+  it("should divide 2 into 4 and return 2", () => {
+    expect(divide(4,2)).toBe(2);
+  });
+});