feb 12 night

Author: INDRESH-009

js_notes/basic-q.js

@@ -21,10 +21,27 @@ Mixed Topics:
 Write a program to find the factorial of a number using a loop.
 Create a simple calculator program that performs addition, subtraction, multiplication, and division based on user input
 
-Some extra advanced questions 
+Some extra advanced questions on functions
 1.Implement a JavaScript program to print Fibonacci series using a for loop.
+2.Write a JavaScript function to find the largest number among three numbers using nested if-else statements.
+3.Write a JavaScript function to calculate the factorial of a number.
+4.Implement a JavaScript function to check if a number is prime or not.
+5.Write a JavaScript function to reverse a string.
+
+Some extra advanced questions on arrays
+1.Write JavaScript code to find the sum of elements in an array.
+2.Implement a function to find the maximum and minimum elements in an array.
+3.Write JavaScript code to remove duplicate elements from an array.
+
+
+ Questions based on Objects 
+1.Create a JavaScript object representing a car with properties like make, model, year, and color.
+2.Write a method to display all properties of the car object.
+3.Implement a function to calculate the total cost of maintenance for the car based on its age and mileage.
 */
 
+
+
 //Q1
 let num = 10;
 let str = "javascript";
@@ -144,15 +161,138 @@ if(inputoperation == "division"){
 }
 
 //Q10 - fibonacci series using for loops
-//fibonacci series have a series of numbers and each number in the series is equivalent to the sum of the previous 2 numbers 
-let fibonacciTermsreq = 10;
-let t1 = 0;
-let t2 = 1;
-console.log(t1);
+//fibonacci series have a series of numbers and each number in the series is equivalent to the sum of the previous 2 numbers
+
+
+let terms = 10; //defining the number of terms req
+let t1 = 0;     //let 1st term is 0
+let t2 = 1;     //let 2nd term is 1
+console.log(t1);//logging t1 and t2
 console.log(t2);
-for(let i=1;i <= fibonacciTermsreq;++i){
-    t1 = t2;
-    t2 = i;
-    let nextterm = t1 + t2;
-    console.log(nextterm);
-}
+for(let i=1;i<=terms;i++){  //loop to iterate and form the fibonacci series
+    let nextterm = t1 + t2; // fibonacci rule - each term is sum          of previous 2 terms t1 and t2
+    t1 = t2;    //now t1 updated to t2 
+    t2 = nextterm;  //t2 updated to nextterm value
+    console.log(nextterm)   //logging the nextterm
+}
+
+// Q11- function to find largerst of 3 numbers
+
+function largestOf3(num1,num2,num3){
+    if(num1>num2 && num1>num3){
+        console.log(`${num1} is greatest`);
+    }
+    else if(num2>num1 && num2>num3){
+        console.log(`${num2} is greatest`);
+    }
+    else if(num3>num1 && num3>num2){
+        console.log(`${num3} is greatest`);
+    }
+    else{
+        console.log("there is not a single greatest number");
+    }
+}
+largestOf3(2,200,20);
+
+// Q12 - make a fn to calulate factorial of a number
+function factorial(num){
+    let ans =1;
+    for(let i=1;i<=num;i++){
+        ans *= i;
+    }
+    return ans;
+}
+console.log(factorial(5));
+
+//here we used console.log statement to log the function because the function is returning ans so to log the returned value we are using console.log , if we log the return statement inside the function itself it doesnt rquire logging while calling the function , we can just call the function and pass the arguments as last examples
+
+//Q13 - Implement a JavaScript function to check if a number is prime or not.
+
+function primechecker(num){
+    for(let i=2;i<num;i++){
+        if(num%i===0){
+            return `${num} is not prime`;
+        }    
+    }
+    return `${num} is prime`
+}
+console.log(primechecker(25));
+console.log(primechecker(2));
+console.log(primechecker(3));
+console.log(primechecker(234));
+console.log(primechecker(23));
+
+// Q-14 Write a JavaScript function to reverse a string.
+function strRev(str){
+    let arrayOfletters = str.split("");
+    let revString = "";
+    for(let i=arrayOfletters.length-1;i>=0;i--){
+        revString += arrayOfletters[i];
+    }
+    return revString;
+}
+console.log(strRev("Indresh is a good boy"));
+
+//Q15 Write JavaScript code to find the sum of elements in an array.
+let sum = 0;
+function sumArray(arr){
+    for(let i=0;i<arr.length;i++){
+        sum += arr[i];
+    }
+    console.log(sum);
+}
+sumArray([1,2,3,4,5]);
+
+// Q16 Implement a function to find the maximum and minimum elements in an array.
+
+function arrayMaxMin(arr){
+    let max = arr[0];
+    for(let i=0;i<arr.length;i++){
+        arr[i]>max ? max = arr[i]:"";
+    }
+    console.log(`${max} is the largest element in he array`);
+    let min = arr[0];
+    for(let j=0;j<arr.length;j++){
+        arr[j]<min ? min = arr[j]:"";
+    }
+    console.log(`${min} is the smallest element in he array`);
+}
+arrayMaxMin([1,2,3,4,5]);
+
+
+// Q17 Write JavaScript code to remove duplicate elements from an array.
+/*function removeDuplicate(arr){
+    for(let i=0;i<arr.length;i++){
+        let letter = arr[i];
+        for(let j=0;j<arr.length;j++){
+            letter == arr[j] ? arr.splice(j,1) : "";
+        }
+    }
+}
+removeDuplicate([1,1,2,3,4,4,3]);*/
+
+function removeDuplicate(arr){
+    for(let i=0;i<arr.length;i++){
+        let letter = arr[i];
+        for(let j = i + 1; j < arr.length; j++){
+            if(letter === arr[j]) {
+            arr.splice(j, 1);
+            j--;
+            }
+        }
+    }
+    return arr;
+}
+
+removeDuplicate([1,1,2,3,4,4,3]);
+
+
+// Q18 Create a JavaScript object representing a car with properties like make, model, year, and color.
+let car = {
+    made : "BMW",
+    model : "sedan",
+    year : 2004,
+    color : "black",   
+}
+console.log(car);
+