Add .00 (toFixed) only if number has less than two decimal places
The below code provides one way to do what you want. There are others.
function addZeroes(num) {
// Cast as number
var num = Number(num);
// If not a number, return 0
if (isNaN(num)) {
return 0;
}
// If there is no decimal, or the decimal is less than 2 digits, toFixed
if (String(num).split(".").length < 2 || String(num).split(".")[1].length<=2 ){
num = num.toFixed(2);
}
// Return the number
return num;
}
console.log(addZeroes(5)); // Alerts 5.00
console.log(addZeroes(5.1)); // Alerts 5.10
console.log(addZeroes(5.11)); // Alerts 5.11
console.log(addZeroes(5.111)); // Alerts 5.111
http://jsfiddle.net/nzK4n/
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
Maybe use .toLocaleString()
:
var num = 5.1;
var numWithZeroes = num.toLocaleString("en",{useGrouping: false,minimumFractionDigits: 2});
console.log(numWithZeroes);
As a function/demo:
function addZeroes(num) {
return num.toLocaleString("en", {useGrouping: false, minimumFractionDigits: 2})
}
console.log('before after correct');
console.log('5 ->', addZeroes(5) , ' --> 5.00');
console.log('5.1 ->', addZeroes(5.1) , ' --> 5.10');
console.log('5.11 ->', addZeroes(5.11) , ' --> 5.11 (no change)');
console.log('5.111 ->', addZeroes(5.111) , ' --> 5.111 (no change)');
console.log('5.1111 ->', addZeroes(5.1111) , '--> 5.1111 (no change)');
console.log('-5 ->', addZeroes(-5) , ' --> -5.00');
And if you must use .toFixed()
, here's a one-liner:
var num = 5.1;
var numWithZeroes = num.toFixed(Math.max(((num+'').split(".")[1]||"").length, 2));
console.log(numWithZeroes);
Or, again, as a function/demo:
function addZeroes(num) {
return num.toFixed(Math.max(((num+'').split(".")[1]||"").length, 2));
}
console.log('before after correct');
console.log('5 ->', addZeroes(5) , ' --> 5.00');
console.log('5.1 ->', addZeroes(5.1) , ' --> 5.10');
console.log('5.11 ->', addZeroes(5.11) , ' --> 5.11 (no change)');
console.log('5.111 ->', addZeroes(5.111) , ' --> 5.111 (no change)');
console.log('5.1111 ->', addZeroes(5.1111) , '--> 5.1111 (no change)');
console.log('-5 ->', addZeroes(-5) , ' --> -5.00');