Adding Decimal to a String in Javascript

Question

I'm given numbers in cents:

eg.

  102042
  982123
  121212

I want to convert them to dollars. I figured the easiest way to do this is to convert the digits into a string and add a decimal.

eg.

  1020.42
  9821.23
  1212.12

I'm currently doing this but it only rounds to 1 decimal. What would I need to do it make it round to 2 decimals?

var number = 102042
number.toString().match(/^-?\d+(?:\.\d{0,2})?/)[0]

UPDATE: I found out what my issue was. It wasn't the rounding but the fact that I combined a lodash filter to a division incorrectly. Thanks again!

In case you don't trust the accuracy of floating-point numbers: `String(number).replace(/..$/, '.$&')` — 4castle, Jul 05 '17 at 03:36

score 3 · Answer 1 · answered Jul 05 '17 at 03:17

3

A cent is 1/100th of a dollar, so you can calculate the dollar amount by doing

dollars = number / 100

answered Jul 05 '17 at 03:17

Matt

score 2 · Answer 2 · answered Jul 05 '17 at 03:18

2

var number = 102042;

console.log(number/100);

answered Jul 05 '17 at 03:18

Dinesh undefined

`102040` would not print the 100ths place. – Patrick Roberts Jul 05 '17 at 03:19

score 2 · Answer 3 · answered Jul 05 '17 at 03:19

2

The easiest way is to do it with the number itself, you can multiply by 0.01 or divide by 100 and you'll get that amount in dollars:

var numbers = [102042,982123,121212];

for(num of numbers) 
  console.log(num/100);

answered Jul 05 '17 at 03:19

JV Lobo

3 Answers3