HW1

session-01/validators.js

@@ -7,7 +7,20 @@
   - username cannot contain special characters
 */
 function validUsername(username) {
-  return;
+ //checks length
+  if( username.length<3 || username.length>10  )
+    return false;
+  // checks for special charcters,\w is used for letters and digit,
+  // having the ^ is negation and is checking the string for everything besides a letter/digit
+  //so if the string does contain something otherthan letter/digit, function will return false
+  if( /[^\w]/.test(username)) return false;
+
+  //checking first chracter is a letter 
+  //the ^ is outside thr [], which chekcs if the first index in the string is a letter or not, 
+  if(!/^[a-zA-z]/.test(username)) return false;
+
+
+  return true;
 }
 
 /*
@@ -17,7 +30,26 @@ function validUsername(username) {
   - password must contain at least 1 letter, 1 number, and 1 special character
 */
 function validPassword(password) {
-  return;
+  //checks length
+  if( password.length<=9 || password.length>=65 ) return false;
+
+  if (!/[a-zA-Z]/.test(password)) {
+    return false;
+  }
+
+  // Check if the password contains at least one number
+  if (!/[0-9]/.test(password)) {
+    return false;
+  }
+
+    //if(!/\w/.test(password)) return false;
+
+  // Check if the password contains at least one special character
+  if (!/[!@#$%^&*(),.?":{}|<>]/.test(password)) {
+    return false;
+  }
+
+  return true;
 }
 
 module.exports = { validUsername, validPassword };

session-02/exercise.js

@@ -3,7 +3,9 @@
   For example, for the input ["cat", "hat"], return ["CAT", "HAT"]
 */
 function transformArrayToUpper(listOfStrings) {
-  return;
+
+
+  return upperCaseListOfStrings = listOfStrings.map((f) => f.toUpperCase());
 }
 
 /*
@@ -16,7 +18,29 @@ function transformArrayToUpper(listOfStrings) {
     the function should return 51
 */
 function sumOfAllAges(listOfStudentObjects) {
-  return;
+   let sum = 0;
+ // uses the typeof to determine if the property exits and is a primitive type number 
+   // for (let i = 0; i < listOfStudentObjects.length; i++) {
+  //     if (typeof listOfStudentObjects[i].age === "number") {
+  //         sum += listOfStudentObjects[i].age;
+  //     } else {
+  //         console.log("No  age  for index " + i);
+  //     }
+  // };
+
+  // uses the "in" opertor checking if the property is in the object if('propertyName' in ObjectName)
+  for (let i = 0; i < listOfStudentObjects.length; i++) {
+      // Check if the 'age' property exists and is a valid number
+      if ('age' in listOfStudentObjects[i] ) {
+          sum += listOfStudentObjects[i].age;
+      } else {
+          console.log("No  age  for index " + i);
+      }
+  }
+
+
+  return sum;
 }
 
+
 module.exports = { transformArrayToUpper, sumOfAllAges };

session-02/loops.js

@@ -25,7 +25,7 @@ for (const fruit of fruits) {
 //   console.log(item);
 // }
 
-// .forEach
+// .forEach, its a function that tkes in a function and applies the function to every element of the index
 // function myPrint(item) {
 //   console.log("Delicious: ", item);
 // }
@@ -40,7 +40,7 @@ console.log(result);
 // callback function
 
 // .map() // transform/convert/change
-
+//your able to return the results into  new array, store into new variable while keeping the original array unchanged
 let pluralFruits = fruits.map((f) => f + "s");
 
 console.log(pluralFruits);

session-02/objects-arrays.js

@@ -63,6 +63,6 @@ console.log(Object.keys(things)); // don't do this
 fruits.push("Durian");
 console.log(fruits);
 
-// pop / shift
+// pop(removes element from the back) / shift(removes element from the front)
 console.log(fruits.pop(), fruits.shift());
 console.log(fruits.length);