Javascript floor is a function to round down the number to an integer. The return type of this function is always a number, and it returns the largest whole number that does not exceed its argument. This article is about Javascript floor() function and its usage. This article will explain what the function does, how it can be used in your programming environment, and what are its return types.

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## What is the Javascript floor?

The Javascript floor() is an operator which will return the largest integer less than or equal to a numeric value, and it’s often used with floating-point numbers.

When a floating-point number is rounded down, it will return an integer value. For example, The Javascript floor() operator rounds the decimal 0.3638 to become 0.36, as shown below:

(0 + 36 / 100) * 1000 = 360; this means that any digits after the decimal point (in this case .36) are truncated and not included in the result when using floor (). So for all intents and purposes, we can also say that floor () returns integers only with no fractional part whatsoever.

## Javascript floor() usage

The Javascript floor() function is used to round numbers down. This means that if you have a number like 123.456, it will be rounded to the closest whole number: 124.

This rounding can also happen when taking square roots or calculating percentages as well, so it’s important for developers and designers alike to know how this concept works in relation to their work!

If you need your final result not rounded, use Math.round(). For example: `Math.floor(123) = "124"`

but `Math.round(123) = "123"`

. The difference between these two methods of rounding is noticeable because they’re out by one decimal place; notice the missing comma (,) at the end of 124 vs. 123.

So for a more accurate result, use Math.round(). If you need your answer rounded to the nearest whole number and didn’t care about what that decimal place is, then use floor () in your code!

It’s important for developers and designers alike to know how this concept works so they can make decisions on which function will work best given their specific needs.

```
var x = 10.5
console.log(Math.floor(x))
```

## Javascript floor Return Types

The floor() function in Javascript returns the largest integer less than or equal to a number. This means that for some numbers, such as -19, it rounds down to negative 18 and leaves positive 19 unchanged. For other integers like 17, it rounds up to 18 because there is no smaller integer below this number.

There are three arguments you can pass into the floor () function: an arbitrary value x (Integer), y (Float), and z (String). The first argument must be of type Integer if passed as being an Integer variable; otherwise, it will fail when attempting to return its results. In contrast with String values which may have any letter lowercase within them, Floats require only digits without decimal points before returning their respective results.

The floor() function follows the standard order of operations, performing parentheses and exponentiation before division or modulus. For instance, it will perform x-y/z first just like y*x/z because these are on the same level in an expression; otherwise, it would simply do a multiplication operation for both values then divide as per z*x/(y+z).

Finally, due to how the floor is calculated within Javascript, its return type cannot be changed into a decimal value – despite that, this may seem counterintuitive with numbers being represented internally by decimals within computers. Floors also have no problem returning negative results since they only need to round down where there isn’t another integer below them, such as -19 rounding down to -20.

## Math.floor() vs math.round()

Math. floor () will always be called before Math.round(), and it is also the second to last step in a given operation because multiplication, division, or modulus are done first within an expression with exponents coming after these three operations as per convention (x-y/z). The only exception to this rule would be if there was another integer below that number, such as -19 rounding down to -20 while 0 rounds up from zero – which can create some interesting results when two of them come together like 17 saying, “I’m not going any lower than 16” by raising itself once more so now its at 18 instead of 15.

If you wanted your flooring calculations rounded, then use math. round(). This function rounds the number off to an integer by rounding towards zero. This function can be used in a variety of calculations where you want your results rounded, such as when determining how many whole dollars are left over after dividing a sum by three and then subtracting it from 255.

By using Math.round() instead of math. floor (), this will ensure that the result is at least one dollar value, if not more than one (depending on what’s left).

## Javascript floor advantages

-It’s easy to calculate the floor of a number

-This is an inbuilt function for Javascript with no need for libraries or plug-ins.

-It’s advantageous for smaller projects because it saves on development time and bandwidth.

-This is a simple function that can be used in many situations, such as generating random numbers or checking if a number is an integer.

-It requires only one line of code to implement this feature into any program, which means the learning curve for understanding how these tools works is short.

-In mathematics, the floor is the operation that produces a number with no fractional part.

-The function of this method in javascript is to round down numbers and give them decimal points as 0 if there are any digits on the right side after rounding. It has been used for many years due to its accuracy when compared to other mathematical methods such as truncating or rounding up.

-The floor function is used in many programming languages such as PHP, Python, and MATLAB.

-It is also used in statistics, as it will round down the number of people surveyed to a whole person.

-It can be applied to any data type, such as integers or decimal numbers.

## Javascript floor disadvantages

- Its return type is always a number.
- It cannot be used in part of the function, like Math. floor(), which can be used mathematically to round down and truncate numbers to an integer value between 0 and some maximum inclusive limit such as 255 or 65536.
- There are no fractional components when using floor ().
- Floor() functions return integers (whole numbers) only, so it may not work with decimal values for rounding purposes if you need them rounded off after they have been divided by other mathematical operations that use decimals themselves to calculate their results.
- If the JavaScript floor() is called on a number that exceeds the range of an integer, then this will return NaN (not a number).
- If JavaScript floor() is used with any other type than an integer such as string or boolean, then this function will also return NaN. Conclusion

Feel like you are a novice when it comes to programming? You’re not alone. Programming languages can be difficult, but they don’t have to be if we break them down into bite-sized pieces and help each other out along the way. That’s why I’m here! This article has given you all of the details about the Javascript floor(). Hopefully, we’ve been able to answer any questions you might have had!

Also read: Math ceil Javascript