js-callbacks-iterators by Jacob Clapper

filter1.js

@@ -22,3 +22,7 @@ let people = [
 let isCool = person => person.coolnessScore > 20
 
 // Your code goes here
+const whoIsCool = people.filter(person => {
+    return person.coolnessScore > 20;
+})
+console.log(whoIsCool)

filter2.js

@@ -2,5 +2,8 @@ let misc = [3, "true", {a: 1, b: 2}, 7, [1, 2, 3], ['a', 'b', 'c'], "my favorite
 
 // Use filter to filter all strings out of the above array. 
 // Don't worry about strings in the nested array (misc[5] is considered an array, not a string)
-
+const allStrings = misc.filter((str) => {
+    return str.substring
+})
 // Your code goes here
+console.log(allStrings)

foreach1.js

@@ -9,3 +9,8 @@
 let foods = ["pizza", "tacos", "ice cream", "sushi"];
 
 // your code here
+
+const iLikeFoods = foods.filter((food) => {
+    return console.log("I like " + food)
+})
+console.log(iLikeFoods)

foreach2.js

@@ -11,4 +11,8 @@ let foods = [
 ];
 
 // your code here
+const goodFoods = foods.forEach((food) => {
+  return console.log(`${food.name} is ${food.level} delicious`)
+})
+console.log(goodFoods)
 

map1.js

@@ -40,3 +40,9 @@ let forecast = [
 // "Monday will have a high of 55F and a low of 53F."
 
 //Your code here
+
+
+const forecastMessage = forecast.map(days => {
+    return `${days.day} will have a high of ${days.high} and a low of ${days.low}."`
+})
+console.log(forecastMessage)

map2.js

@@ -6,3 +6,17 @@ let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]
 // e.g. "36 is larger than 30"
 
 //Your code here
+
+const squareEachNumber = numbers.map(num => {
+    return Math.pow(num, 2)
+})
+
+console.log(squareEachNumber)
+
+
+
+const largerThan30 =  squareEachNumber.filter(overThirty => {
+    return overThirty > 30
+})
+
+console.log(largerThan30)

reduce.js

@@ -34,8 +34,15 @@ const cities = [
 
 // Use reduce to get the sum of the population of all 5 cities
 
+const addPopulation = cities.reduce((world, city) => {
+    return city.population + world ;
+}, 0)
+console.log(addPopulation)
 // Use reduce to get the city with the highest population (output should be an object)
-
+// const highestPopulation = cities.reduce((world, city) => {
+//       return city.population + world ;
+//   }, 0)
+//   console.log(addPopulation)
 // Even hungrier:
 
 const developers = [
@@ -86,6 +93,21 @@ const developers = [
 
 // This one is HARD
 
+// reduce has optional second argument
+// this will stand for the initial value
+// const ageSum = instructors.reduce((sum, instructor) => {
+//     return sum + instructor.age ;
+// }, 0)
+
+// console.log(ageSum)
+
+// const makeSum = (num1, num2) => {
+//       return num1 + num2.age
+//   }
+//   const ageSum = instructors.reduce(makeSum, 0)
+//   console.log(ageSum)
+
+
 // Hint 1: the desired output is an object, you might want to use that as your initial value