Javascript Math Floor Decimal Places

A number can be rounded off to upto 2 decimal places using two different approaches in javascript.

Javascript math floor decimal places.

The output type of tofixed is a string which needs to be passed to a top level function called parsefloat to return a number unfortunately this seems to be really slow. If the passed argument is an integer the value will not be rounded. Math floor x parameters x a number. We were able to round the float 2 333 to 2 decimal places.

If the desired number of decimals are higher than the actual number zeros are added to create the desired decimal length. Because floor is a static method of math you always use it as math floor rather than as a method of a math object you created math is not a constructor. The tofixed method converts a number into a string rounding to a specified number of decimals. Math floor math ceil and math round the way math trunc works is very simple.

As you probably know weird precision things can happen with floating point values and on the other side of the spectrum if the number happens to be 15 sounds like the op wants 15 00. Rounding numbers with decimal precision requires a little bit of calculation and math round optionally we can use the tofixed method that belongs to the number prototype. This is a solid answer. A couple of improvements i can think of.

The number tofixed method takes an integer as an input and returns the the given number as a string in which the fraction is padded to the input integers length. For 383 48910093 we changed the second parameter to 4. It truncates cuts off the dot and the digits to the right of it no matter whether the argument is a positive or negative number. An integer such as 5 will become 5 00 with two zeros being appended behind the decimal place.

A number representing the largest integer less than or equal to the specified number. 2 make number of decimal places dynamic not hard coded to 2. The floor method rounds a number downwards to the nearest integer and returns the result. Unlike the other three math methods.

The string 9 01345 was rounded to 9 01. This rounded the number to 4 decimal places resulting in 383 4891. 1 that should solve the rounding issue. 3 tofixed seems unnecessary.