CODEWITHSUNDEEP
javascript
RaneWrites
RaneWrites

Reputation: 278

Printing a whole number as a decimal in Javascript without rounding

I have a simple problem to solve, I have a variable containing a double, I'm reading in another double from user input. I need to sum the two numbers and print the result to the screen. In other languages I have worked in, just the fact that it was a double would result in it printing with a decimal, even if it is a whole number. In Javascript, this is not the case.

var d = 2.0;
console.log(d) // out is 2

I can force it to print a decimal by using toFixed(), but then it is going to round results of other input. If the result is 2.0, I want it to print "2.0" and if the result is 2.345, I want it to print "2.345".

The solution I have right now is to convert it to a string if it is a whole number:

var d2 = 4.0
console.log((d2 % 1 == 0) ? d2+".0" : d2) // out is 4.0

I feel like there must be some better way to do this. This seems very clunky to me. I've been searching for solutions, but everything I have found so far uses toFixed() or some other rounding.

Upvotes: 1

Views: 1969

Answers (4)

Roshan Giri
Roshan Giri

Reputation: 1

function number(r){
const a= 4.43
const answer= a.tofixed(4)
console.log(answer)
return answer
}

Upvotes: -1

Mohamed Allal
Mohamed Allal

Reputation: 20870

For better dynamic printing (no useless leading zeroes) Use:

Number(num.toFixed(5)).toString()

Here an example to show the interpretation:

const num = 2.2;
console.log(
    Number(num.toFixed(5)).toString()
);
// 2.2

const num = 2.2;
console.log(
    num.toFixed(5)
);

// 2.20000

[Notice] You can use node interpreter to test faster and have a playground:

enter image description here

Upvotes: 0

Olu Adabonyan
Olu Adabonyan

Reputation: 93

Try this:

var d = 2.0;
var parsD = parseFloat(d);   //you have to parse d either as Float or Integer
console.log(parsD) // out will be in decimal without rounding up

You have to decide the number of decimals. Be realistic. e.g. for financial issues, 2 decimal places is just OK. In which case change line 2 to:

var parsD = parseFloat(d).toFixed(n)  //where n is an integer & number of decimals

This works fine. In my case, I receive input on a form. The input can be integer or decimal. However when processing, every input is treated as decimal.

Upvotes: 1

mr.freeze
mr.freeze

Reputation: 14060

I think a more Number-y solution could be:

var d = 4.0
var ds = Number.isInteger(d) ? d.toPrecision(2) : d.toString();
console.log(ds)

Upvotes: 1

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