Exercise added for splice() and slice()

docs/Exercise/JavaScript_Basics/Splice_&_Slice.md

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+Questions on Splice:
+
+1. **write** the code/function(use splice()) to add "Saturday" inside daysOfTheWeek in the correct position if:
+var daysOfTheWeek = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Sunday"]
+
+**Expected Output**:
+ var daysOfTheWeek = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday","Saturday", "Sunday"]
+
+2. Given var monthsOfTheYear = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"] , write a code/function(use splice()) to remove all months beginning from May and including May.
+
+**Expected Output**:
+monthsOfTheYear = [ 'January', 'February', 'March', 'April' ]
+
+3. Given var numbers = ['1','2','2','4','5'] , remove the repeated number and insert '3' such that the numbers are in ascending order.
+
+**Expected Output**:
+numbers = ['1','2','3','4','5']
+
+4. Does splice() modify the original array?
+
+Questions on Slice:
+
+1. **write** the code/function(use slice()) to extract "Saturday" from daysOfTheWeek array:
+var daysOfTheWeek = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday","Saturday", "Sunday"]
+
+2. What will citrus contain?
+
+var fruits = ["Banana", "Orange", "Lemon", "Apple", "Mango"];
+var citrus = fruits.slice(-3,-2);
+
+3. Does slice() modify the original array?