Casey OKeefe

src/services/array-functions.js

@@ -1,56 +1,82 @@
 
 //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){
-
+export function map (theArray, fnc) {
+  let finalArr = [];
+  for (let i = 0; i < theArray.length; i++) {
+    finalArr.push(fnc(theArray[i]));
+  }
+  return finalArr;
 }
 
 //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){
-
+export function filter (theArray, fnc) {
+  let finalArr = [];
+  for (let i = 0; i < theArray.length; i++) {
+    if(fnc(theArray[i])) {
+      finalArr.push(theArray[i]);
+    }
+  }
+  return finalArr;
 }
 
 
-//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){
-
+  let finalArr = [];
+  for (let i = 0; i < theArray.length; i++) {
+    if(fnc(theArray[i])) {
+      finalArr.push(theArray[i]);
+    }
+  }
+  return finalArr;
 }
 
 
 //return the last item in theArray
 export function findLast(theArray){
-
+  let newArr = [];
+  newArr.push(theArray[theArray.length - 1]);
+  return newArr;
 }
 
 //return the first element of the array
 export function head(theArray){
-
+  return theArray[0];
 }
 
 //create a new array
 //loop theArray in reverse order
 //add the item from each loop to the new array
 //return the new array
 export function reverse(theArray){
-
+  let finalArr = [];
+  for (let i = theArray.length - 1; i >= 0; i--) {
+    finalArr.push(theArray[i]);
+  }
+  return finalArr;
 }
 
 //create a new array
 //loop theArray
 //add the item from each loop to the new array except the first item
 //return the new array
-export function tail(theArray){
-
+export function tail(theArray) {
+  let finalArr = [];
+  for (let i = 1; i < theArray.length; i++) {
+    finalArr.push(theArray[i]);
+  }
+  return finalArr;
 }
 
 //implement the most basic sorting algorithm there is
@@ -63,6 +89,15 @@ export function tail(theArray){
 //if a swap is done set it to true
 //after each for loop check the variable, if true, continue the while loop
 //if false return theArray
-export function sort(theArray){
-
-}
+export function sort (theArray) {
+  let finalArr = theArray;
+  for (let i = 0; i < finalArr.length - 1; i++) {
+    if (finalArr[i] > finalArr[i + 1]) {
+      let temp = finalArr[i];
+      finalArr[i] = finalArr[i + 1];
+      finalArr[i + 1] = temp;
+      i = -1;
+    }
+  }
+  return finalArr;
+}

src/tests/array-functions.test.js

@@ -1,4 +1,4 @@
-import {map,filter,find,findLast} from "../services/array-functions";
+import {map,filter,find,findLast,head,sort,reverse,tail} 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 +34,75 @@ describe("map", () => {
   });
 });
 
+//filter should return an array with names of length 3
+//["Jon","Bob","Ted","Axe"]
+describe("filter", () => {
+  it("should filter the array for names equal to 3 letters", () => {
+    expect(filter(names,findThree)).toEqual([
+      "Jon",
+      "Bob",
+      "Ted",
+      "Axe"
+    ]);
+  });
+});
+
+//find should find one name of "Barney"
+describe("find", () => {
+  it("should find the name Barney", () => {
+    expect(filter(names,findBarney)).toEqual([
+      "Barney"
+    ]);
+  });
+});
+
 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"]
 
-//find should find one name of "Barney"
 
 //findLast should find the last name of "Axe"
+describe("findLast", () => {
+  it("should find the last name in the array", () => {
+    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 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"
+    ]);
+  });
+});

src/tests/calculations.test.js

@@ -1,7 +1,31 @@
-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 and 1 and return 1", () => {
+    expect(subtract(2, 1)).toBe(1);
+  });
+});
+
+describe("multiply", () => {
+  it("should multiply 2 and 2 and return 4", () => {
+    expect(multiple(2, 2)).toBe(4);
+  });
+});
+
+describe("divide", () => {
+  it("should divide 3 and 3 and return 1", () => {
+    expect(divide(3, 3)).toBe(1);
+  });
+});
+
+describe("extra", () => {
+  it("this is an extra test", () => {
+    expect(true).toBe(true);
+  });
+});