How to Format a Float as Integer When .Tofixed(2) Gives Zeros After the Decimal Point

How to format a float as integer when .toFixed(2) gives zeros after the decimal point?

...preferrably without parsing and manipulating the string that comes out of .toFixed(2)?

Well, you could do it numerically, though I'd worry about getting a perfect match between numeric logic and toFixed's logic, given the definition of toFixed includes phrases like:

Let n be an integer for which the exact mathematical value of n ÷ 10^f - x is as close to zero as possible. If there are two such n, pick the larger n.

So I'd probably just update the string, it's not a lot of work:

function formatNumber(num) {    return num.toFixed(2).replace(/\.00$/, "");}
function test(num) {    console.log(num, "=>", formatNumber(num));}test(1.01);test(1.43);test(23.7);test(1.200123);test(1.000043);test(1.007);test(1.0007);

Add .00 (toFixed) only if number has less than two decimal places

Here you go:

function addZeroes(num) {
// Convert input string to a number and store as a variable.
    var value = Number(num);      
// Split the input string into two arrays containing integers/decimals
    var res = num.split(".");     
// If there is no decimal point or only one decimal place found.
    if(res.length == 1 || res[1].length < 3) { 
// Set the number to two decimal places
        value = value.toFixed(2);
    }
// Return updated or original number.
return value;
}

// If you require the number as a string simply cast back as so
var num = String(value);

See fiddle for demonstration.

edit: Since I first answered this, javascript and I have progressed, here is an improved solution using ES6, but following the same idea:

function addZeroes(num) {
  const dec = num.split('.')[1]
  const len = dec && dec.length > 2 ? dec.length : 2
  return Number(num).toFixed(len)
}

Updated fiddle

edit 2: Or if you are using optional chaining you can do it in one line like so:

const addZeroes = num => Number(num).toFixed(Math.max(num.split('.')[1]?.length, 2) || 2)

Updateder fiddle

How to parse float with two decimal places in javascript?

You can use toFixed() to do that

var twoPlacedFloat = parseFloat(yourString).toFixed(2)

Truncate number to two decimal places without rounding

Convert the number into a string, match the number up to the second decimal place:

function calc(theform) {    var num = theform.original.value, rounded = theform.rounded    var with2Decimals = num.toString().match(/^-?\d+(?:\.\d{0,2})?/)[0]    rounded.value = with2Decimals}

<form onsubmit="return calc(this)">Original number: <input name="original" type="text" onkeyup="calc(form)" onchange="calc(form)" /><br />"Rounded" number: <input name="rounded" type="text" placeholder="readonly" readonly></form>

add trailing zeroes if a number is an integer in TypeScript

You are probably looking for toFixed:

console.log((9.01111).toFixed(2)); // 9.01
console.log((9.01).toFixed(2));    // 9.01
console.log((9).toFixed(2));       // 9.00

How to format a float in javascript?

var result = Math.round(original*100)/100;

The specifics, in case the code isn't self-explanatory.

edit: ...or just use toFixed, as proposed by Tim Büthe. Forgot that one, thanks (and an upvote) for reminder :)

How to Format a Float as Integer When .Tofixed(2) Gives Zeros After the Decimal Point