Excersises I finished.

chapter04.js

@@ -8,43 +8,91 @@
 
 
 // Problem 1: The sum of a range
-function range(start, end, step=1) {
-  // Your code here
+function range(num1, num2, num3=1) {
+  // Idk why this code is crashing the test
+  // var arr =[];
+  //
+  // while(num1 !== num2 && num1 >= 0){
+  //     arr.push(num1);
+  //     num1 += num3;
+  // }
+  //  arr.push(num2);
+  //  return arr;
 }
 
-function sum(array) {
-  // Your code here
+function sum(val) {
+  var total = 0;
+  for(var i = 0; i < val.length; i++){
+   total += val[i];
+  }
+  return total;
 }
 
 // Problem 2: Reversing an Array
-function reverseArray(array) {
+function reverseArray(arr) {
   // Your code here
+  var revArr = [];
+  for(var i = arr.length-1; i >= 0; i--){
+   revArr.push(arr[i]);
+  }
+  return revArr;
 }
 
-function reverseArrayInPlace(array) {
+function reverseArrayInPlace(arr) {
   // Your code here
+  var temp = 0;
+  var count = 0;
+  for(var i = arr.length-1; i >= arr.length/2; i--){
+    temp = arr[count];
+    arr[count] = arr[i];
+    arr[i] = temp;
+
+    count++;
+  }
+  return arr;
 }
 
 // Problem 3: A List
-function arrayToList(array) {
+function arrayToList(arr) {
   // Your code here
+  var list = null;
+   for(var i = arr.length-1; i >= 0; i--){
+       list = {value: arr[i], rest: list};
+   }
+ return list;
 }
 
 function listToArray(list) {
   // Your code here
+  var arr = [];
+    while(list){
+      arr.push(list.value);
+      list = list.rest;
+    }
+  return arr;
 }
 
-function nth(list, position) {
+function nth(list, num) {
   // Your code here
+  if(num === 0){
+    return list.value;
+  }else if(!list){
+    return undefined;
+  }else{
+    return nth(list.rest, num - 1);
+  }
 }
 
-function prepend(element, list) {
+function prepend(val, list) {
   // Your code here
+  var newList = {value: val, rest: list};
+  return newList;
 }
 
 // Problem 4: Deep comparison
-function deepEqual(obj1, obj2) {
+function deepEqual(comp1, comp2) {
   // Your code here
+
 }
 
 

chapter05.js

@@ -21,12 +21,20 @@ ancestry.forEach(function(person) {
 // Problem 1: Flattening
 function flatten(arrays) {
   // Your code here
+  var newArr = arrays.reduce(function(startArr, currArr){
+    	return startArr.concat(currArr);
+  });
 }
 
 // Problem 2: Mother-child age difference
 /* This must return the average age difference instead of printing it */
 function averageMomChildAgeDiff() {
   // Your code here
+  function mother(p) { return byName[p.mother] != null; };
+
+  var ageDiff = ancestry.filter(mother).map(function(p) {
+    return p.born - byName[p.mother].born;
+  });
 }
 
 // Problem 3: Historical life expectancy
@@ -40,4 +48,3 @@ function averageAgeByCentury() {
 
 // Do not modify below here.
 module.exports = { flatten, averageMomChildAgeDiff, averageAgeByCentury };
-