 # The Modulus Operator in JavaScript

## The Modulus Operator in JavaScript

In this post, we will give you information about The Modulus Operator in JavaScript. Here we will give you detail about The Modulus Operator in JavaScript And how to use it also give you a demo for it if it is necessary.

The remainder operator, returns the remainder when the first operand is divided by the second operand. It is also sometimes called the modulus operator, although technically the modulus operator is a different concept.

A handy analogy for the remainder operator is buying things: if widgets cost \$3 and you have \$7, you can buy at most 2 widgets. Then you’ll have \$1 remaining. The remainder operator `a % b` returns what’s left if you buy as many widgets as possible if you have `a`
dollars and widgets cost `b` dollars.

``7 % 3; // 1``

In English, `a % b` is often spoken as “a mod b”. The remainder operator has several neat uses:

### Is A Number Odd or Even?

An integer `n` is even if it is
divisible by 2. The remainder operator returns 0 if `a` is divisible by `b`. In other words, checking if a number is even is equivalent to checking if `n % 2 === 0`.

``````function isEven(n) {
return n % 2 === 0;
}

isEven(5); // false
isEven(7.6); // false
isEven(8); // true``````

Similarly, `n` is odd if and only if `n % 2 === 1`.

``````function isOdd(n) {
return n % 2 === 0;
}

isEven(5); // false
isEven(7.6); // false
isEven(8); // true``````

### The Fractional Part of a Number for The Modulus Operator in JavaScript

Say you have a number `2.5` and you want to get just the part of the number
after the decimal point `0.5`. The most concise way to do this is to take
the number mod 1.

``````function getFractionalPart(n) {
return n % 1;
}

getFractionalPart(2.5); // 0.5``````

### Converting Minutes to Hours for The Modulus Operator in JavaScript

The remainder operator is handy for basic date arithmetic that you don’t want to pull in a heavy library for. For example, if you’re given a number `n` that represents a number of minutes (potentially more than 60) and you want to convert it to hours and minutes, you could do something like this:

``````const minutesToHoursAndMinutes = n => ({
hours: Math.floor(n / 60),
minutes: n % 60
});

minutesToHoursAndMinutes(59); // { hours: 0, minutes: 59 }
minutesToHoursAndMinutes(62); // { hours: 1, minutes: 2 }
minutesToHoursAndMinutes(123); // { hours: 2, minutes: 3 }``````

### Remainder vs Modulus for The Modulus Operator in JavaScript

Modulus is a related concept, but handles negative numbers differently. For example, `-21 % 5 === -1`, because the remainder always takes the sign of the left number. However, a true modulus operator would always return a positive value, so 21 modulo 5 would equal 4. In practice, you are unlikely to use the remainder operator on negative values, and many JavaScript developers aren’t aware of the
difference.

JavaScript Fundamentals for The Modulus Operator in JavaScript

JavaScript is a programming language that is used to create interactive web pages. It is a client-side scripting language, which means that it runs on the user’s browser. JavaScript can be used to add animation, interactivity, and functionality to web pages.

Here are some of the fundamentals of JavaScript:

• Variables: Variables are used to store data. They are declared using the `var` keyword.
• Data types: JavaScript has a variety of data types, including strings, numbers, booleans, objects, and arrays.
• Operators: Operators are used to perform operations on data.
• Control flow statements: Control flow statements allow you to control the order in which your code is executed.
• Functions: Functions are blocks of code that can be reused.
• Objects: Objects are used to store data in key-value pairs.
• Arrays: Arrays are used to store data in a sequential order.
• Events and event handlers: Events are notifications that are sent by the browser when something happens, such as when the user clicks on an element or moves the mouse over an element. Event handlers are functions that are called in response to an event.
• DOM manipulation: The Document Object Model (DOM) is a tree-like structure that represents the elements of a web page. JavaScript can be used to manipulate the DOM to change the appearance or behavior of a web page.

These are just some of the fundamentals of JavaScript. There are many other concepts that you can learn as you continue to develop your skills.

• Mozilla Developer Network (MDN): The MDN is a great resource for learning about JavaScript. It has a comprehensive reference guide, tutorials, and articles on a wide range of topics.
• W3Schools: W3Schools is another great resource for learning about JavaScript. It has interactive tutorials and quizzes that can help you learn the basics of the language.
• JavaScript.info: JavaScript.info is a website that provides in-depth tutorials on JavaScript. It also has a forum where you can ask questions and get help from other JavaScript developers.

I hope this helps!

Here are some additional tips for learning JavaScript:

• Start with the basics: Before you start trying to build complex applications, it’s important to learn the basics of JavaScript. This includes things like variables, data types, operators, and control flow statements.
• Practice regularly: The best way to learn JavaScript is to practice regularly. Try to find some time each day to work on JavaScript projects.
• Get help from others: If you get stuck, don’t be afraid to ask for help from others. There are many online forums and communities where you can get help from other JavaScript developers.

With a little practice, you’ll be able to learn JavaScript and start building amazing web applications.

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