Minwook Kang Assignment

exercises/part1-fizzbuzz/index.js

@@ -25,7 +25,12 @@ Start code
 
 ===================== */
 
-
+for (let i = 1; i <= 100; i ++){
+    if (i%3 === 0 && i%5 === 0) {console.log("FizzBuzz");
+} else if (i%3 === 0) {console.log("Fizz");
+} else if (i%5 === 0) {console.log("Buzz");
+} else {console.log(i);}
+}
 
 
 /* =====================

exercises/part2-basic-functions/index.js

@@ -13,76 +13,112 @@ in years. (Let's just assume this person was born January 1 at 12:01 AM)
 Example: "age(2000) should return 22"
 ===================== */
 
-let age = (birthYear) => {};
+let age = (birthYear) => {
+    return 2022 - birthYear
+};
 
-console.log('age success:', age(1971) === 51);
+console.log('age:', age(1991))
+
+/*console.log('age success:', age(1971) === 51);
 
 /* =====================
 Instructions: Write a function that adds one to the number provided
 Example: "plusOne(2) should return 3"
 ===================== */
 
-let plusOne = () => {};
+let plusOne = (x) => {
+    return x+1;
+};
+console.log(plusOne(2))
 
-console.log('plusOne success:', plusOne(99) === 100);
+/*console.log('plusOne success:', plusOne(99) === 100);
 
 /* =====================
 Instructions: Write a function that multiplies the number provided by three
 Example: "timesThree(2) should return 6"
 ===================== */
 
-let timesThree = () => {};
+let timesThree = (x) => {
+    return x*3;
+};
+console.log(timesThree(2))
 
-console.log('timesThree success:', timesThree(33) === 99);
+/*console.log('timesThree success:', timesThree(33) === 99);
 
 /* =====================
 Instructions: Write a function that adds two given numbers
 Example: "add(2, 3) should return 5"
 ===================== */
 
-let add = () => {};
+let add = (x, y) => {
+    return x+y
+};
+console.log(add(2,3))
 
-console.log('add success:', add(4, 6) === 10);
+/*console.log('add success:', add(4, 6) === 10);
 
 /* =====================
 Instructions: Write a function that multiplies two given numbers
 Example: "multiply(2, 3) should return 6"
 ===================== */
 
-let multiply = () => {};
+let multiply = (x, y) => {
+    return x*y;
+};
+console.log(multiply(2,3));
 
-console.log('multiply success:', multiply(4, 6) === 24);
+/*console.log('multiply success:', multiply(4, 6) === 24);
 
 /* =====================
 Instructions: "Write a function that returns the value of an array at a specified index"
 Example: "valueAtIndex(['Mercury', 'Venus', 'Earth', 'Mars'], 2) should return 'Earth'"
 ===================== */
 
-let valueAtIndex = () => {};
-
-console.log('valueAtIndex success:', valueAtIndex([9, 8, 7, 6, 5], 2) === 7);
-
+let valueAtIndex = (arr, i) => {
+    return arr[i]
+};
+console.log(valueAtIndex(['Mercury', 'Venus', 'Earth', 'Mars'], 2))
+
 /* =====================
 Instructions: "Write a function that returns the value of an object at a specified key"
 Example: "valueAtKey({'name': 'Nathan'}, 'name') should return 'Nathan'"
 ===================== */
 
-let valueAtKey = () => {};
-
-console.log('valueAtKey success:', valueAtKey({ 'foo': 'bar' }, 'foo') === 'bar');
+let valueAtKey = (object, key) => {
+    return object[key]
+};
+console.log(valueAtKey({ 'foo': 'bar' }, 'foo'));
 
 /* =====================
 Instructions: Write a function that returns true if a number is even.
 ===================== */
 
-let isEven = () => {};
+let isEven = (x) => {
+    if(x%2 === 0){console.log("true")
+}   else {
+    console.log("false")
+}
+}
 
-console.log('isEven success:', isEven(2) === true && isEven(3) === false);
+console.log(isEven(2))
+console.log(isEven(3))
+/*console.log('isEven success:', isEven(2) === true && isEven(3) === false);
 
 /* =====================
 Instructions: Write a function that returns true if a number is odd.
 ===================== */
 
 let isOdd = () => {};
 
-console.log('isOdd success:', isOdd(4) === false && isOdd(5) === true);
+let isOdd = (x) => {
+    if(x%2 != 0){console.log("true")
+}   else {
+    console.log("false")
+}
+}
+
+console.log(isOdd(2))
+console.log(isOdd(3))
+
+
+/*console.log('isOdd success:', isOdd(4) === false && isOdd(5) === true);

exercises/part3-iterators/index.js

@@ -16,7 +16,15 @@ Instructions: Write a function which counts the number of times a value occurs i
 Example: countItem(['a', 'b', 'a'], 'a') should return 2
 ===================== */
 
-let countItem = (arr, item) => {};
+let countItem = (arr, item) => {
+  let count = 0;
+  for (let i = 0; i < arr.length; i++) {
+    if (arr[i] === item){
+      count++;
+    }
+  }
+  return count;
+};
 
 console.log('countItem success:', countItem([1, 2, 3, 4, 5, 4, 4], 4) === 3);
 
@@ -27,8 +35,23 @@ Instructions: Write a function which takes an array and returns a new array with
   original array.
 ===================== */
 
-let isEven = (n) => {};
-let filterEven = (arr) => {};
+let isEven = (x) => {
+  if (x%2 === 0){
+    return (x%2 === 0);
+  } else {
+    return ("NA");
+  }
+};
+
+let filterEven = (arr) => {
+  let evenArr = [];
+  for (i = 0; i < arr.length; i++){
+    if (isEven(arr[i]) === true ){
+      evenArr.push(arr[i])
+    }
+  }
+  return evenArr
+};
 
 console.log('filterEven success:', _(filterEven([1, 2, 3, 4, 5, 4, 4])).isEqual([2, 4, 4, 4]));
 
@@ -38,8 +61,23 @@ Instructions: Write a function which takes an array and returns a new array with
   function MUST use the isOdd function and MUST NOT change the original array.
 ===================== */
 
-let isOdd = (n) => {};
-let filterOdd = (arr) => {};
+let isOdd = (x) => {
+  if (x%2 != 0){
+    return (x%2 !=0)
+  } else {
+    return ("NA")
+  }
+};
+
+let filterOdd = (arr) => {
+  let oddArr =[];
+  for (i=0; i<arr.length; i++){
+    if (isOdd(arr[i]) === true){
+      oddArr.push(arr[i]);
+    }
+  }
+  return oddArr
+};
 
 console.log('filterOdd success:', _(filterOdd([1, 2, 3, 4, 5, 4, 4])).isEqual([1, 3, 5]));
 
@@ -50,8 +88,16 @@ Instructions: Write a function which takes an array and returns a new array with
   original array.
 ===================== */
 
-let plusOne = (n) => {};
-let mapIncrement = (arr) => {};
+let plusOne = (x) => {
+  return x+1
+};
+let mapIncrement = (arr) => {
+  let plusArr = [];
+  for (i=0; i<arr.length; i++){
+    plusArr.push(plusOne(arr[i]))
+  }
+  return plusArr
+};
 
 console.log('mapIncrement success:', _(mapIncrement([1, 2, 3, 4, 5, 4, 4])).isEqual([2, 3, 4, 5, 6, 5, 5]));
 
@@ -62,8 +108,16 @@ Instructions: Write a function which takes an array and returns a new array with
   original array.
 ===================== */
 
-let timesThree = (n) => {};
-let mapTriple = (arr) => {};
+let timesThree = (x) => {
+  return x*3
+};
+let mapTriple = (arr) => {
+  let tripleArr = [];
+  for (i=0; i<arr.length; i++){
+    tripleArr.push(timesThree(arr[i]))
+  }
+  return tripleArr
+};
 
 console.log('mapTriple success:', _(mapTriple([1, 2, 3, 4, 5, 4, 4])).isEqual([3, 6, 9, 12, 15, 12, 12]));
 
@@ -74,8 +128,17 @@ Instructions: Write a function which takes an array and returns the sum of all
   array.
 ===================== */
 
-let add = (n1, n2) => {};
-let reduceSum = (arr) => {};
+let add = (x, y) => {
+  return x+y
+};
+
+let reduceSum = (arr) => {
+  let totalSum = 0;
+  for (i=0; i<arr.length; i++){
+    totalSum = add(totalSum, arr[i]);
+  }
+  return totalSum;
+};
 
 console.log('reduceSum success:', reduceSum([1, 2, 3, 4, 5, 4, 4]) === 23);
 
@@ -86,7 +149,15 @@ Instructions: Write a function which takes an array and returns the product of
   original array.
 ===================== */
 
-let multiply = (n1, n2) => {};
-let reduceProduct = (arr) => {};
+let multiply = (x, y) => {
+  return x*y
+};
+let reduceProduct = (arr) => {
+  mtpl = 1;
+  for (i=0; i<arr.length; i++){
+    mtpl = multiply(mtpl, arr[i]);
+  }
+  return mtpl
+};
 
 console.log('reduceProduct success:', reduceProduct([1, 2, 3, 4, 5, 4, 4]) === 1920);