Integer division, also known as "floor division," is a way to divide two numbers and return only the whole number result, discarding any remainder or decimal value. In JavaScript, we can perform integer division using the "Math.floor()" function or the "//" operator.

Example 1: Using Math.floor()

```
let num1 = 7;
let num2 = 3;
let result = Math.floor(num1 / num2);
console.log(result);
```

In this example, we are dividing 7 by 3 and using the Math.floor() function to round down to the nearest whole number. The output will be 2, as 7 divided by 3 equals 2 with a remainder of 1.

Example 2: Using the "//" operator

```
let num1 = 7;
let num2 = 3;
let result = num1 // num2;
console.log(result);
```

In this example, we are again dividing 7 by 3, but this time we are using the "//" operator to perform integer division. The output will again be 2, as 7 divided by 3 equals 2 with a remainder of 1.

It is important to note that the "//" operator is a relatively new addition to JavaScript, and may not be supported by all browsers or older versions of JavaScript. If you need to ensure compatibility with older browsers or environments, it is best to stick with using the Math.floor() function for integer division.

In addition, it's worth noticing that these examples are assuming that both num1 and num2 are integers, otherwise the result will be rounded down to the nearest integer.

It's also worth mentioning that in some cases you could use the bitwise operator `>>`

to perform some simple integer division in javascript.

```
let num1 = 8;
let num2 = 2;
let result = num1 >> num2;
console.log(result);
```

In this example, we are dividing 8 by 2 and the result will be 4. The bitwise operator `>>`

is a quick way to divide a number by 2^n where n is the number of bits shifted. In this case, 2^2=4, so we got the same result as doing 8/4.

In conclusion, integer division in JavaScript can be performed using the Math.floor() function or the "//" operator, depending on your needs and compatibility requirements. The examples above should give you a good starting point for working with integer division in your code.

In addition to integer division, there are a few other related concepts and techniques that are commonly used when working with numbers in JavaScript.

Modulus operator: The modulus operator, represented by the "%" symbol, is used to find the remainder of a division operation. This can be useful in cases where you need to determine if a number is odd or even, for example.

```
let num1 = 7;
let num2 = 3;
let remainder = num1 % num2;
console.log(remainder);
```

In this example, the output will be 1, as 7 divided by 3 equals 2 with a remainder of 1.

Rounding: JavaScript provides several built-in functions for rounding numbers, including Math.round(), Math.ceil(), and Math.floor().

- Math.round() rounds a number to the nearest whole number.
- Math.ceil() rounds a number up to the next whole number.
- Math.floor() rounds a number down to the previous whole number.

```
let num1 = 3.14159;
console.log(Math.round(num1));
console.log(Math.ceil(num1));
console.log(Math.floor(num1));
```

In this example, Math.round(num1) will output 3, Math.ceil(num1) will output 4, and Math.floor(num1) will output 3.

Parsing: JavaScript provides several built-in functions for parsing numbers from strings, including parseInt() and parseFloat().

- parseInt() parses a string and returns an integer.
- parseFloat() parses a string and returns a floating-point number.

```
let str = "3.14159";
let num = parseFloat(str);
console.log(num); // 3.14159
let str1 = "14";
let num1 = parseInt(str1);
console.log(num1); // 14
```

In this example, parseFloat(str) will output 3.14159, parseInt(str1) will output 14.

It's also worth mentioning that JavaScript provides many other built-in functions and methods for working with numbers, such as the Math object, which provides properties and methods for performing common mathematical operations, and the Number object, which provides properties and methods for working with numbers as objects.

In conclusion, these are some of the concepts and techniques related to integer division in javascript. Understanding these concepts and how to use them can make your code more efficient, readable and maintainable.

## Popular questions

- What is integer division in JavaScript?

- Integer division, also known as "floor division," is a way to divide two numbers and return only the whole number result, discarding any remainder or decimal value.

- How can we perform integer division in JavaScript?

- In JavaScript, we can perform integer division using the "Math.floor()" function or the "//" operator.

- Can we use the "//" operator in older versions of JavaScript?

- The "//" operator is a relatively new addition to JavaScript, and may not be supported by all browsers or older versions of JavaScript. If you need to ensure compatibility with older browsers or environments, it is best to stick with using the Math.floor() function for integer division.

- How do you find the remainder of a division operation?

- The modulus operator, represented by the "%" symbol, is used to find the remainder of a division operation. This can be useful in cases where you need to determine if a number is odd or even, for example.

- How do you round a number in javascript?

- JavaScript provides several built-in functions for rounding numbers, including Math.round(), Math.ceil(), and Math.floor(). Math.round() rounds a number to the nearest whole number, Math.ceil() rounds a number up to the next whole number and Math.floor() rounds a number down to the previous whole number.

### Tag

Arithmetic.