Update Homework week 3

lab/lab1/part1.js

@@ -6,8 +6,25 @@
 Instructions: "Write a function that adds one to the number provided"
 Example: "plusOne(2) should return 3"
 ===================== */
+/* =====================
+   var f = function(num1) {
+     var ff= function (num2){
+       return num1+num2
+     }
+   }
+  f(1)(2)
+  ===================== */
+
+
+
 
-var plusOne = function() {};
+
+
+var plusOne = function(num) {
+  if(typeof num ==='number'){
+    return num = num + 1
+  }
+};
 
 console.log('plusOne success:', plusOne(99) === 100);
 
@@ -17,7 +34,11 @@ Instructions: "Write a function, age, that takes a birth year and returns an age
 Example: "age(2000) should return 18"
 ===================== */
 
-var age = function(birth) {};
+var age = function(birth) {
+  if (typeof birth === 'number') {
+    return birth = 2017-birth
+  }
+};
 
 console.log('age success:', age(1971) === 46);
 
@@ -26,7 +47,13 @@ Instructions: "Write a function that returns true for numbers over 9000 and fals
 Example: "over9000(22) should return false"
 ===================== */
 
-var over9000 = function() {};
+var over9000 = function(num) {
+  if (num > 9000){
+    return true
+  } else{
+    return false
+  }
+};
 
 console.log('over9000 success:', over9000(9001) === true && over9000(12) === false);
 
@@ -35,7 +62,9 @@ Instructions: "Write a function that returns the value of an object at a specifi
 Example: "valueAtKey({'name': 'Nathan'}, 'name') should return 'Nathan'"
 ===================== */
 
-var valueAtKey = function() {};
+var valueAtKey = function(key,name) {
+  return key[name]
+};
 
 console.log('valueAtKey success:', valueAtKey({'foo': 'bar'}, 'foo') === 'bar');
 
@@ -45,7 +74,9 @@ Example: "y(0, 0, 0) should return 0; y(1, 1, 1) should return 2"
 Remember: The standard mathematical expression for such a function is y=mx+b
 ===================== */
 
-var y = function() {};
+var y = function(a,b,c) {
+  return a*b+c
+};
 
 console.log('y success:', y(12, 1, 12) === 24);
 
@@ -54,7 +85,13 @@ Instructions: "Write a function which counts the number of times a value occurs
 Example: "countItem(['a', 'b', 'a'], 'a') should return 2"
 ===================== */
 
-var countItem = function() {};
+var countItem = function(num,x) {
+  count = 0
+  for (var i = 0; i < num.length; i++) {
+      if (num[i] === x){
+        count = count + 1
+      }
+    } return count
+};
 
 console.log('countItem success:', countItem([1, 2, 3, 4, 5, 4, 4], 4) === 3);
-

lab/lab1/part2.js

@@ -7,15 +7,23 @@ Functions that `return` can be passed as values to other functions. Each exercis
 Instructions: Write a function that *always* returns the number 1.
 ===================== */
 
-var justOne = function() {};
+var justOne = function() {
+  return 1
+};
 
 console.log('justOne success:', justOne() === 1);
 
 /* =====================
 Instructions: Write a function that returns true if a number is even.
 ===================== */
 
-var isEven = function() {};
+var isEven = function(num) {
+  if (num%2 === 0){
+    return true
+  }else {
+    return false
+  }
+};
 
 console.log('isEven success:', isEven(2) === true && isEven(3) === false);
 
@@ -24,15 +32,21 @@ Instructions: Write a function that *always* returns false.
               Use functions "justOne" and "isEven" somehow in the definition.
 ===================== */
 
-var justFalse = function() {};
+var justFalse = function(fal) {
+  return !justOne
+};
 
 console.log('justFalse success:', justFalse() === false);
 
 /* =====================
 Instructions: Write a function that takes a boolean value and returns its opposite.
 ===================== */
 
-var not = function() {};
+var not = function(boolean) {
+  if (true) {return false
+      } else { return true
+  }
+};
 
 console.log('not success:', not(true) === false);
 
@@ -41,19 +55,52 @@ Instructions: Write a function that returns true if a number is odd
               Use functions "isEven" and "not" somehow in the definition.
 ===================== */
 
-var isOdd = function() {};
+var isOdd = function(num) {
+   return !(isEven(num));
+};
 
 console.log('isOdd success:', isOdd(4) === false);
 
 /* =====================
 Instructions: Write a function that takes a list of numbers and returns a list with only numbers above 10
 ===================== */
 
-var filterOutLessThan10 = function() {};
+var filterOutLessThan10 = function(list) {
+  holder = []
+  for (var i = 0; i < num.length; i++){
+    if(list[i] > 10){
+      holder.push(list[i])
+    }
+  } return holder
+};
+
 // The function 'arraysEqual' (which it is your task to define) is necessary because
 // ([4] === [4]) is *false* in javascript(!!!)
 // Use google + stackoverflow to figure out how to define a function which returns true given two equal arrays
-function arraysEqual(arr1, arr2) { return false; }
+function arraysEqual1(arr1, arr2) {
+  if (arr1 === arr2) {
+    return true;} else if (arr1 == null || arr2 == null) {
+    return false;} else if (arr1.length != arr2.length) {
+      return false;}
+      else{
+  for (var i = 0; i < arr1.length; i++) {
+  if (arr1[i] !== arr2[i]) {
+    return false;
+      }
+    }
+  }
+return true;
+}
+
+function arraysEqual(arr1){
+  hold=[];
+  for (var i = 0; i < arr1.length; i++){
+    if(arr1[i] > 10)  {
+      hold.push(arr1[i])
+    }
+  } return hold;
+}
+
 console.log('filterOutLessThan10 success:', arraysEqual([4, 11], [11]));
 
 /* =====================
@@ -63,7 +110,14 @@ Instructions: Let's bring it all together. Write a function that filters a list
               2. a function that takes a value and returns true (to keep a number) or false (to toss it out)
 ===================== */
 
-var filter = function(array, func) {};
+var filter = function(array, func) {
+  var hold=[];
+  for (var i = 0; i < array.length; i++){
+    if (func(array[i]) == true){
+      hold.push(array[i]);
+    }
+  }
+  return hold
+};
 
 console.log('filter success:', filter([4, 11], isOdd) === [11]);
-

lab/lab2/part1.js

@@ -19,62 +19,62 @@ console.log('Nathan\'s list', nathanGameList);
 What is the first game in Jeff's list?
 ===================== */
 
-var query1;
+var query1 = _.first(jeffGameList);
 
 console.log('What is the first game in Jeff\'s list?', query1);
 
 /* =====================
 What are all of the games except for the first game in Jeff's list?
 ===================== */
 
-var query2;
+var query2 = _.rest(jeffGameList);
 
 console.log('What are all of the games except for the first game in Jeff\'s list?', query2);
 
 /* =====================
 What is the last game in Nathan's list?
 ===================== */
 
-var query3;
+var query3 = _.last(nathanGameList);
 
 console.log('What is the last game in Nathan\'s list?', query3);
 
 /* =====================
 What are all of the games in Nathan's list except for the last?
 ===================== */
 
-var query4;
+var query4 = _.initial(nathanGameList);
 
 console.log('What are all of the games in Nathan\'s list except for the last?', query4);
 
 /* =====================
 What would Nathan's game list look like if he sold "catan"?
 ===================== */
 
-var query5;
+var query5 = _.without(nathanGameList,"catan");
 
 console.log('What would Nathan\'s game list look like if he sold "catan"?', query5);
 
 /* =====================
 If Nathan and Jeff play a board game, what are their options? This should be a list of all games owned by Jeff or Nathan, with no duplicates.
 ===================== */
 
-var query6;
+var query6 = _.union(jeffGameList,nathanGameList);
 
 console.log('If Nathan and Jeff play a board game, what are their options? This should be a list of all games owned by Jeff or Nathan, with no duplicates.', query6);
 
 /* =====================
 Which games are owned by both Jeff and Nathan?
 ===================== */
 
-var query7;
+var query7 = _.intersection(jeffGameList,nathanGameList);
 
 console.log('Which games are owned by both Jeff and Nathan', query7);
 
 /* =====================
 Which games are exclusive to collections? In other words, only owned by either Jeff or Nathan.
 ===================== */
 
-var query8;
+var query8 = _.difference(jeffGameList,nathanGameList);
 
 console.log('Which games are exclusive to one collection? In other words, only owned by either Jeff or Nathan (but not both!).', query8);

lab/lab2/part2.js

@@ -27,7 +27,11 @@ Calculate the value by using _.countBy and set your answer to variable "largeSta
 ===================== */
 
 var data = bikeArrayClean;
+var largeStationList=_.filter(data,function(array){return array[3]>20;});
+console.log(largeStationList)
 
-var largeStationList;
 
-var largeStationCount;
+var largeStationCount = _.countBy(data,function(num){
+  return num[3]>20? 'largeStation':'smallStation';
+});
+console.log(largeStationCount)