DEV Community: Mohamed Haarish

operators in javascrip.

Mohamed Haarish — Thu, 27 Aug 2026 17:51:25 +0000

Operators are special symbols used in JavaScript to perform calculations and compare values.

In the example, a = 10 and b = 3.

Arithmetic Operators

Addition +

console.log(a + b); // 13
Adds two values.

Subtraction -

console.log(a - b); // 7
Subtracts one value from another.

Multiplication *

console.log(a * b); // 30
Multiplies two values.

Division /

console.log(a / b); // 3.333...
Divides one value by another.

Modulus %

console.log(a % b); // 1
Returns the remainder after division.

Exponentiation **

console.log(a ** b); // 1000

Raises a to the power of b.

Comparison Operators
Comparison operators are used to compare two values.

console.log("9" == 9); // true
console.log("9" === 9); // false
console.log("1" !== 1); // true

• == checks values and can convert the data type.
• === checks both value and data type.
• !== checks that the value or data type is different.

Conclusion

JavaScript operators are important for calculations, comparisons, and decision-making in programs. Arithmetic operators perform mathematical operations, while comparison operators help us compare values.

simple javascript calculator

Mohamed Haarish — Wed, 26 Aug 2026 18:38:11 +0000

this code is used to create a simple calculator using javascript.

1.three important variables

let previousvalues ="";
let operator = "";
let currentvalue ="";

. Previous Value → first number
. Operator → +, -, *, /
. Current Value → second number

2.ENTERING NUMBER

appendnumber() adds the number we press.

for example;

1 → 2 → 3

plain text
currentvalue =123

3.selection an operator

When we press +, -, *, or /, the calculator stores the operator.
example;

plain text

10+5

now;

plain text

This JavaScript code is used to create a simple calculator.

Three Variables

let previousValue = "";
let operator = "";
let currentValue = "";

. Previous Value → first number
. Operator → +, -, *, /
. Current Value → second number

Entering Numbers appendNumber() adds the number we press.

For example:

1 → 2 → 3
currentValue = 123

Selecting an Operator When we press +, -, *, or /, the calculator stores the operator. Example: 10 + 5

Now:
the calculator uses three main values ;
previousValue = 10
operator = +
currentValue = 5

Calculating The calculate() function performs the operation.

10 + 5 = 15
10 - 5 = 5
10 * 5 = 50
10 / 5 = 2
Number() converts the value into a number before calculating.

Easy to Remember

Previous Value = First number
Operator = What operation to do
Current Value = Second number
Calculate = Gives the answer

So the calculator simply works like:

First number → Operator → Second number → Answer

object of funtion in javascript

Mohamed Haarish — Tue, 25 Aug 2026 18:10:39 +0000

object:
an object is used to store data in key -value pairs.

javascript

let person={
name:"haarish",
age:21
};
console.log(person.name);

output.
haarish

funtion

A funtion is a reusable block of code that perform a specific task.

example?
funtion great() {
console.log("Hello")
}
great();

output.
Hello

in simple words:

.object=store data
.funtion=performs a task

primitive data type in javascript.

Mohamed Haarish — Mon, 24 Aug 2026 12:20:07 +0000

primitive data types are the basic types of values in javascript has 7 primitive data types ;

1.string -text
*let name = "Haarish";

2.number -r numbers(integer or decimal)
*let age =25;

3.boolean -true or false
*let isstudebt =true;

4.undefined -A varible declard but no value assigned
*let x;

5.null -represent an intentionally empty value
*let data =null

6.biglnt -very larg integers
*let big =12345678901234567890n;

7.symbol -used to creat unique values
*let id =symbol ("id");

interview answer

" javascript has 7 primitive data types : string , numbrer ,boolean ,undefined ,null,biglnt,and symbol."

my first interview question html&css :)

Mohamed Haarish — Wed, 19 Aug 2026 07:26:32 +0000

1.Tell me about yourself?
Hi,im mohamed haarish .im from pudukkottai 'dc' ammapattinam .im stady in collage jj collage arts and science pudukkottai 'dc' .im a motivated and hardworking person with an interest in web development. i have basic knowledge of html and css , and im eager to learn new technologies and improve my skills. im looking for an opportunity where i can grow and contribute to the company.

2.what is html?
html(Hypertext markup language )is used to create the structure of web pages.

3.what is css ?
css(cascading style sheets ) is used to style and design html elements.

4.what is flex?
flex is css layout system.
it is used to arrange and align elements in a row or column.
it makes responsive layouts easier.

5.what is div?

is an html block- level container .
it is used to group and organize html elements.
it is commonly used for creating website layouts.