Rahulsingh3526 patch 1

Day 1/Fundamentals1.md

@@ -30,7 +30,7 @@ console.log(message) //run this command to check if it's changed
 
   ```javascript
   let myVeryLongNamedVariable; // another way to declare a variable is to just iniate it and 
-  myVeryLongNamedVariable = "Longest Variable Nmae ever!" // then assign value like this
+  myVeryLongNamedVariable = "Longest Variable Name ever!" // then assign value like this
   ```
 
   - Variables are casesensitive. `apple` and `ApplE` are different variables.
@@ -48,4 +48,4 @@ console.log(message) //run this command to check if it's changed
 - Ethics Of Naming a Variable -
   - A variable should be named in such a way that it tells what it stores.
   - Use human-readable names.
-  - Stay away from shortnames or abbreviations like `a`, `b` & `c`, unless required.
+  - Stay away from shortnames or abbreviations like `a`, `b` & `c`, unless required.

JS Day 3/README.md

@@ -0,0 +1,138 @@
+# Arrays
+
+Arrays are data structures that can store multiple values at once.
+
+The syntax of Arrays looks something like this
+
+```javascript
+VariableType VariableName = [arrayBody];
+```
+
+Let's look at an example
+```javascript
+
+const words = ["Hello" , "World" , "Welcome to LW3"];
+console.log(words);
+```
+## Here are different types of arrays
+```javascript
+const myList = [];  // Empty array
+
+const numArray = [1,2,3,4,5]; // Number array
+
+const stringArray = ["eat" , "sleep" , "code" , "repeat"]; // string array
+
+const types = ["eat" , "excercise" , 1 , true]; // mixed array
+```
+
+### Note : The index starts from 0 not 1
+```javascript
+const array = ['a' , 'e' , 'i', 'o' , 'u'];
+//             0 ,  1  ,  2 ,  3  ,  4        indices
+//             1 ,  2 ,   3,   4,    5        elements
+```
+
+## Inbuilt Functions
+
+### Add elements to an array using inbuilt functions
+There are two inbuilt functions that add elements to an array
+- The first one is the push() function.
+Push method is used to add elements at the end of an array
+
+- Here is an example for better understanding.
+```javascript
+let dailyActivities = ['eat' ,  'sleep'];
+
+dailyActivities.push('Toilet'); 
+
+console.log(dailyActivities);
+```
+
+- The second one is the unshift function.
+Unshift is used to add elements in the beginning of an array
+
+- For example
+```javascript
+let dailyActivities = ['eat' ,  'sleep'];
+
+dailyActivities.unshift('Toilet');
+
+console.log(dailyActivities);
+```
+
+
+### Change the elements of an array using inbuilt functions
+
+ You can also add elements or change the elements by accessing the index value.
+
+```javascript
+let dailyActivities = [ 'eat', 'sleep'];
+
+// this will add the new element 'exercise' at the 2 index
+dailyActivities[2] = 'exercise';
+console.log(dailyActivities); // This will print ['eat', 'sleep', 'exercise']
+```
+
+Suppose, an array has two elements. If you try to add an element at index 3 (fourth element), the third element will be undefined. 
+For example :
+
+```javascript
+let dailyActivities = [ 'eat', 'sleep'];
+
+// this will add the new element 'exercise' at the 3 index
+dailyActivities[3] = 'exercise';
+
+console.log(dailyActivities); // This will print ["eat", "sleep", undefined, "exercise"]
+```
+
+Basically, if you try to add elements to high indices, the indices in between will have undefined value.
+
+### Remove an element using inbuilt functions
+
+You can use the pop() method to remove the last element from an array. The pop() method also returns the returned value. 
+For example:
+
+```javascript
+let dailyActivities = ['work', 'eat', 'sleep', 'exercise'];
+
+// remove the last element
+dailyActivities.pop();
+console.log(dailyActivities); // ['work', 'eat', 'sleep']
+
+// remove the last element from ['work', 'eat', 'sleep']
+const removedElement = dailyActivities.pop();
+
+//get removed element
+console.log(removedElement); // 'sleep'
+console.log(dailyActivities);  // ['work', 'eat']
+```
+
+If you need to remove the first element, you can use the shift() method. The shift() method removes the first element and also returns the removed element.
+For example:
+
+```javascript
+let dailyActivities = ['work', 'eat', 'sleep'];
+
+// remove the first element
+dailyActivities.shift();
+
+console.log(dailyActivities); // ['eat', 'sleep']
+```
+
+### find the length of an array using inbuilt functions
+
+You can find the length of an element (the number of elements in an array) using the length property.
+For example:
+```javascript
+const dailyActivities = [ 'eat', 'sleep'];
+
+// this gives the total number of elements in an array
+console.log(dailyActivities.length); // 2
+```
+
+
+## Resources to learn:
+
+[Programiz](https://www.programiz.com/javascript/array)
+
+[Youtube](https://youtu.be/oigfaZ5ApsM)

JS Day 3/array.js

@@ -0,0 +1,29 @@
+// program to remove item from an array
+
+function removeItemFromArray(array, n) { // we declare a function with two arguments here 
+    const newArray = [];                 // and then we create a new array here
+
+    for ( let i = 0; i < array.length; i++) {    // here we are running a loop from 0 up until the length of the array parameter
+        if(array[i] !== n) {                    // using the if statement we are saying if the array of i which is assigned in the loop is not strict equal to n
+            newArray.push(array[i]);           // then add the element to newArray
+        }
+    }
+    return newArray;                        // return the new array using the return statement
+}
+
+const result = removeItemFromArray([1, 2, 3 , 4 , 5], 2);      // We store the function result
+
+console.log(result);  // Here we are printing th result in return
+
+/*
+Summary :
+
+In the above program, an item is removed from an array using a for loop.
+
+Here,
+
+The for loop is used to loop through all the elements of an array.
+While iterating through the elements of the array, if the item to remove does not match with the array element, that element is pushed to newArray.
+The push() method adds the element to newArray.
+
+*/