update post first session

arrays/arrays.js

@@ -16,15 +16,15 @@ console.log(scores.length)
 
 /*
  * Looping over arrays
- *
- * 1st match income -> 1 x runs
- * 2nd match income -> 2 x runs
- * 3rd match income -> 3 x runs
  */
+// let totalScores = 0;
 // for (let i = 0; i < scores.length; i++) {
-//   console.log(scores[i] * (i + 1)); // 1st match -> Index = 0
+//     let currScore = scores[i];
+//     totalScores += currScore;
 // }
 
+// console.log(totalScores);
+
 /*
  * Manipulating arrays
  */
@@ -32,7 +32,6 @@ console.log(scores.length)
 
 // updating elements
 // scores[0] = 21; // replaces 20
-// scores[10] = 0;  // throws error as index 11 isn't availabel
 
 // console.log(scores)
 

arrays/arraysActivity1Solution.js

@@ -16,7 +16,8 @@ let outputArr = [];
 for (let i = 0; i < arr.length; i++) {
   // check if index is 0
   if (i === 0) {
-    outputArr.push(arr[i]);
+    let currElement = arr[i];
+    outputArr.push(currElement);
 
   } else {
     let currElement = arr[i];
@@ -25,6 +26,6 @@ for (let i = 0; i < arr.length; i++) {
 
     outputArr.push(currValue);
   }
-};
+}
 
 console.log(outputArr); // should print [1, 3, 5, 7, 9]
\ No newline at end of file

asyncAwait/asyncAwait.js

@@ -16,6 +16,7 @@ promise
 // }
 
 // let promiseAsync = longRunning(); // outputs a Promise object
+// console.log(promiseAsync);
 
 // console.log("hi")
 // promiseAsync
@@ -35,12 +36,18 @@ promise
 //   return "longRunning";
 // }
 
+// Handling resolved case  - .then()
+// async function main() {
+//   let promise = longRunning();
+//   let output = await promise;
+//   console.log(output);
+// }
+
+// Handling rejected case as well - .catch()
 // async function main() {
-//   console.log("hi");
 //   try {
 //     let msg = await longRunning();
 //     console.log(msg);
-//     console.log("bye");
 //   } catch (err) {
 //     console.log(err);
 //   }
@@ -68,13 +75,13 @@ promise
 //   return "Promise1";
 // }
 
-// async function promise2() {
-//   return "Promise2";
+// async function promise2(msg) {
+//   return "Promise2: " + msg;
 // }
 
 // async function main() {
 //   let msg1 = await promise1();
-//   let msg2 = await promise2(); // line is executed only after promise on prev line is fulfilled
+//   let msg2 = await promise2(msg); // line is executed only after promise on prev line is fulfilled
 
 //   console.log(msg1);
 //   console.log(msg2);

asyncAwait/asyncAwaitActivity1Solution.js

@@ -14,11 +14,11 @@ async function asyncFn2() {
 
 async function main() {
   try {
-    let promise1 = await asyncFn1();
-    console.log(promise1);
+    let msg1 = await asyncFn1();
+    console.log(msg1);
 
-    let promise2 = await asyncFn2();
-    console.log(promise2);
+    let msg2 = await asyncFn2();
+    console.log(msg2);
   } catch (err) {
     console.log(err);
   }

fetch/fetch.js

@@ -7,32 +7,27 @@ const fetch = require("node-fetch");
 
 // What does "https://api.github.com/users" return? - Try visiting from browser
 
-// Fetch Response object
-fetch(`https://api.github.com/users`).then((res) => console.log(res));
+async function main() {
+  let promise = fetch("https://api.github.com/users");
+  console.log(promise);
 
-// Check if response was successful - status codes in [200, 299]
-fetch(`https://api.github.com/users`).then((res) => console.log(res.ok));
+  // let res = await promise; // returns Response object
+  // console.log(res);
+
+  // Check if response was successful - status codes in [200, 299]
+  // console.log(res.ok);
+  
+  // let data = await res.json(); // json() method as well returns a promsie
+  // console.log(data);
+
+  // console.log(data[0]);
+  // console.log(data[0].login);
+}
+
+main();
 
-/*
- * Parsing response data in JSON format to JS object
- */
 // Using .then().catch()
 // fetch(`https://api.github.com/users`)
 //   .then((res) => res.json())
 //   .then((data) => console.log(data))
 //   .catch((error) => console.log(error));
-
-// Using async-await
-async function main() {
-  try {
-    let res = await fetch(`https://api.github.com/users`);
-    let data = await res.json();
-
-    // print *array* of user *objects* returned
-    console.log(data);
-  } catch (err) {
-    console.log(err);
-  }
-}
-
-main();

functions/functions.js

@@ -2,15 +2,6 @@
  * Creating functions
  */
 
-// Need for functions
-let p1 = 10;
-let p2 = 20;
-console.log(p1 + p2);
-
-let p3 = 5;
-let p4 = 6;
-console.log(p3 + p4);
-
 // Function declaration syntax
 // function add(p1, p2) {
 //   // Logic goes here
@@ -23,12 +14,15 @@ console.log(p3 + p4);
 /*
  * Functions as first-class citizens
  */
+// Passing functions around as values
+// let addDuplicate  = add;
+// console.log(addDuplicate(10, 20))
 
 // Function expression
-let myAddFn = function (p1, p2) {
-  return p1 + p2;
-};
-console.log(myAddFn(10, 20));
+// let myAddFn = function (p1, p2) {
+//   return p1 + p2;
+// };
+// console.log(myAddFn(10, 20));
 
 /*
  * Note - 

functions/functionsActivity1Solution.js

@@ -4,8 +4,8 @@
  * - Callback function prints to the console output of the addition
  */
 function add(p1, p2, callback) {
-  let res = p1 + p2;
-  callback(res);
+  let sum = p1 + p2;
+  callback(sum);
 }
 
 function cb(msg) {

higherOrderFunctions/higherOrderFunctions.js

@@ -2,7 +2,7 @@
  * for-loops vs map
  */
 
-// scorecard of Kholi's batting performance over a 5-match ODI series
+// scorecard of Kohli's batting performance over a 5-match ODI series
 let runsScored = [20, 100, 53, 44, 21];
 
 // calculate match income -> 10 x runs scored
@@ -38,11 +38,7 @@ console.log(incomeArray);
 
 // find match scores with atleast a 50
 // fiftyScores = runsScored.filter(currScore => currScore >= 50); // callback function returns if element satisfied condition
-
-// same as
-// fiftyScores = runsScored.filter((currScore) => {
-//   return currScore >= 50;
-// });
+// console.log(fiftyScores);
 
 // same as
 // fiftyScores = runsScored.filter(function (currScore) {

higherOrderFunctions/higherOrderFunctionsActivity1.js

@@ -8,4 +8,10 @@ let names = ["Anil", "Dhoni", "Kohli", "Aaron", "Ajinkya"];
 // store names starting with "A"
 let namesStartingWithA;
 
-console.log(namesStartingWithA); // should print [ 'Anil', 'Aaron', 'Ajinkya' ]
+/* 
+ * Hint: 
+ * let currElem = "Anil";
+ * currElem[0] === "A"; // evaluates to true
+ */
+
+console.log(namesStartingWithA); // should print [ 'Anil', 'Aaron', 'Ajinkya' ]
\ No newline at end of file

objects/objects.js

@@ -13,6 +13,7 @@ console.log(scorecard);
 
 // objects defined using Object constructor
 // let scorecardConstructor = new Object();
+// console.log(scorecardConstructor);
 
 // scorecardConstructor.runs = 329;
 // scorecardConstructor.wicketsLost = 9;
@@ -46,16 +47,17 @@ console.log(scorecard);
 /*
  * "this" keyword and functions as values
  */
-// let scorecard = {
-//   runs: 329,
-//   wicketsLost: 9,
-//   team: "India",
-//   summary: this.team + " scored " + this.runs + " runs!",
-//   chant: function () {
-//     return "Go India, go!";
-//   },
-// };
+let scorecard = {
+  runs: 329,
+  wicketsLost: 9,
+  team: "India",
+  chant: function () {
+    return "Go " + this.team + ", go!";
+  },
+};
+
+// console.log("Team " + scorecard.team + " scored " + scorecard.runs);
 
 // console.log(scorecard);
-// console.log(scorecard.summary);
-// console.log(scorecard.chant());
\ No newline at end of file
+// let chant  = scorecard.chant();
+// console.log(chant);
\ No newline at end of file

promises/promises.js

@@ -14,9 +14,7 @@
 //     }, 1000); // takes ~1s to complete
 //   };
 
-//   console.log("Start execution");
 //   longRunning(); // don't wait for this function to complete
-//   console.log("Continue execution");
 // });
 
 // console.log(promise);
@@ -44,9 +42,7 @@
 //     }, 2000); // takes ~2s to complete
 //   };
 
-//   console.log("Start execution");
 //   longRunning1(); // don't wait for this function to complete
-//   console.log("Continue execution");
 // });
 
 // let promise2 = new Promise(function (resolve, reject) {