DEV Community: Abinaya V

Tell me about yourself

Abinaya V — Sat, 25 Apr 2026 09:38:11 +0000

My name is Abinaya

“Hi, I’m currently pursuing a Java Full Stack Development course. I have hands-on experience in HTML, CSS, and JavaScript, and I’ve built a few projects using these technologies.

I regularly write blogs on Dev.to about what I learn, and I push my code daily to GitLab, which helps me stay consistent and improve my development skills.

I also have basic knowledge of digital marketing, which gives me some understanding of user engagement.

Right now, I’m focusing on strengthening my backend skills in Java, and I’m looking forward to applying my knowledge in real-world projects and growing as a full stack developer.”

javascript scenario questions(Variables,Operators,conditional statements)

Abinaya V — Mon, 20 Apr 2026 17:37:33 +0000

1.you building a login system.store username and password in variables and check whether both are filled.

2.creat variables to store a product's name,price,and stock.print a message like:
"iphone cost ₹60000 and only 5 left in stock".

3.store a student's marks in 3 subject and calculate total.

4.Swap two numbers without using a third variable

5.Create a variable that stores whether a user is logged in or not and show a welcome message.

6.An e-commerce website gives a 10% discount.calculate final price.

7.Check whether a number is even or odd using operator.

8.Compare two passwords entered by user.

9.A person is eligible to vote if age>=18.write condition

10.Use logical AND to check:
-User is logged in
-User is admin
** Then allow dashboard acces**

11.Create a function that calculate total cart amount.

12.create a function to greet a user by name.

13.Create a function to convert celsius to Fahrenheit.

14.Create a function that returns the largest of two numbers.

15.Create a function to calculate EMI for a loan.(TBD)

16. If user role is "admin" show admin panel,else show user dashboard.

17. check if number is positive,negative, or zero.

*18. Check if a year is leap year. *

*19. Movie ticket pricing: Child(<12)-₹100 Adult-₹200. *

20. If marks >=90-Grade A 75-Grade B else-Fail.

METHODS OF ARRAY

Abinaya V — Wed, 08 Apr 2026 14:15:52 +0000

A method in an array (JavaScript) is simply a built-in function that works on arrays.
It helps you add, remove, search, or modify elements inside an array.

What is an Array Method?

    An array method is a function attached to an array object.

Example:

  let fruits = ["apple", "banana", "mango"];

  fruits.push("orange"); // push() is a method

  console.log(fruits);

basic Array Methods

1. push() → Add element at end

    let arr = [1, 2, 3];
    arr.push(4);
    console.log(arr); // [1, 2, 3, 4]

2. pop() → Remove last element

     let arr = [1, 2, 3];
     arr.pop();
     console.log(arr); // [1, 2]

3. shift() → Remove first element

    let arr = [1, 2, 3];
    arr.shift();
    console.log(arr); // [2, 3]

4. unshift() → Add element at beginning

   let arr = [1, 2, 3];
   arr.unshift(0);
   console.log(arr); // [0, 1, 2, 3]

5. length → Find size of array

 let arr = [10, 20, 30];
 console.log(arr.length); // 3

6. indexOf() → Find position

  let arr = ["a", "b", "c"];
  console.log(arr.indexOf("b")); // 1

7. includes() → Check value exists

 let arr = [1, 2, 3];
 console.log(arr.includes(2)); // true

8. slice() → Get part of array

 let arr = [1, 2, 3, 4];
 console.log(arr.slice(1, 3)); // [2, 3]

9. splice() → Add/Remove elements

 let arr = [1, 2, 3];
 arr.splice(1, 1); // remove 1 element at index 1
 console.log(arr); // [1, 3]

10. forEach() → Loop through array

let arr = [1, 2, 3];
arr.forEach(function(num) {
console.log(num);
});

OBJECT IN JAVA SCRIPT

Abinaya V — Wed, 08 Apr 2026 07:06:16 +0000

Simple Definition

An object is a container that holds properties (data) and methods (functions).

Example

let person = {
name: "Abi",
age: 21,
city: "Chennai"
};

console.log(person.name); // ABI

1. Different Types of Values

let keyName = "score";

let student = {
[keyName]: 100
};

console.log(student.score); // 100

2. Dynamic Keys

let keyName = "score";

let student = {
[keyName]: 100
};

console.log(student.score); // 100

Objects in JavaScript

Abinaya V — Tue, 07 Apr 2026 07:01:12 +0000

object means:

   In JavaScript, an object is a data type used to store multiple values in one variable. These values are stored as key–value pairs.

Think of an object like a real-world object.

**For example, a car has:**
   -color
   -brand
   -model

In JavaScript, that looks like this:

Here:
car → the object
color, brand, model → keys (also called properties)
"red", "Toyota", "Corolla" → values

CRUD means:

C → Create
R → Read
U → Update
D → Delete

1. CREATE (Add new data)

student.mark = 85;
console.log(student);
output
{ name: "Abi", age: 20, course: "JavaScript", mark: 85 }

2. READ (Get data)

console.log(student.name);       // Abi
console.log(student["course"]);

3. UPDATE (Modify data)

 student.age = 21;
 console.log(student.age); // 21

4. DELETE (Remove data)

 delete student.course;
 console.log(student);

output
{ name: "Abi", age: 21, mark: 90 }

“Function in JavaScript and its types”

Abinaya V — Sat, 04 Apr 2026 12:15:27 +0000

function

In JavaScript, a function is a block of code designed to perform a specific task. It runs only when it is called (invoked).
Think of a function as a reusable piece of code—you write it once and use it many times.

Basic Syntax

function functionName() {
// code to execute
}
Example
function greet() {
console.log("Hello!");
}

greet();

Function with Parameters

You can pass values (called parameters) into a function:
function greet(name) {
console.log("Hello " + name);
}

greet("abi");

output:
Hello abi

Function with Return Value

function add(a, b) {
return a + b;
}

let result = add(3, 5);

output:
8

Types of Functions in JavaScript

Function Declaration(version 1)

 function add (no1,no2){
    return no+1no+2;
 }

Function Expression(version 2)

 const add =function(no+no2){
    return no1+no2;

}

Arrow Function(version 3)

 function greeting(name){

return"good moring"+name;
}
short version for arrowtype

program 1 for use one argument

const greeting =name=>"good morning"+name;
console.log (greeting("abi"));

program 2 for use two argument

const add=(no1,no2)=>no1+no2
console.log(add(5,10);

Program for More than one line code

const add(no1,no2)=>{
let result=no1,no2;
return result;
}

Array promblems in java script

Abinaya V — Fri, 03 Apr 2026 12:25:02 +0000

****1.Find Fail count,if fail count is > 0 print (NO GRADE), Find Total,Find Average,if avg>90 print GRADE A,if avg>80 print GRADE B,if avg>70 print GRADE C,if avg>50 print GRADE D,else print GRADE E

const mark = [60,50,50,50,50]
let failCount = 0;
let i = 0;
let sum = 0;
while(i<5){
sum = sum + mark[i];
if (mark[i]<50){
fCount++
}
i++;
}
let avg = sum/mark.length;

if (fCount>0){

console.log("NO GRADE")
} else {
console.log("failCount is ;",fCount);
console.log("average mark is:",avg);
console.log("total mark:",sum);
}
if (avg>=90){

console.log("A grade")
} else if(avg>=80){
console.log("B grade")
} else if (avg>=70){
console.log("C grade")
}else if (avg>=50){
console.log("D grade")
} else {
console.log("E grade")
}

output

2.the program for fail in any one subject

const mark = [30,50,50,50,50]
let failCount = 0;
let i = 0;
let sum = 0;
while(i<5){
sum = sum + mark[i];
if (mark[i]<50){
failCount++

}
i++;
}
let avg = sum/mark.length;
if (fCount>0){
console.log("NO GRADE")
} else {
console.log("failCount is ;",fCount);
console.log("average mark is:",avg);
console.log("total mark:",sum);

}
if (avg>=90){
console.log("A grade")
} else if(avg>=80){
console.log("B grade")
} else if (avg>=70){
console.log("C grade")
}else if (avg>=50){
console.log("D grade")
} else {
console.log("E grade")
}

output

Array in java script

Abinaya V — Fri, 03 Apr 2026 06:29:29 +0000

In JavaScript,an array is an ordered collection of values. Unlike some other languages, JavaScript arrays are dynamic (their size can change) and can hold a mix of different data types, such as numbers, strings, and even other arrays.

Creating Arrays

The most common way to create an array is using array literal notation with square brackets [].

Empty Array: let fruits = [];
With Elements: let fruits = ["Apple", "Banana", "Cherry"];

Simple Definition for array:

An array in JavaScript is a special variable used to store multiple values in a single variable.

An array holds a list of items (like numbers, strings, objects, etc.) in an ordered way.

looping

Abinaya V — Fri, 27 Mar 2026 08:52:03 +0000

In JavaScript,
looping means repeatedly executing a block of code until a specified condition is no longer true. Loops are a fundamental concept that help automate repetitive tasks, saving time and making code more efficient.

variables*
The best loop type and variable declaration keyword (let vs. var) depend on your specific needs, such as iterating over a range of numbers, array elements, or object properties.

problem

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