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How Can Someone Loop A JSON And Manipulate Its Values (convert To String, Set Fixed Decimals And Add Thousands Separator)?

- 1 answer

I fetch data from a third party API which returns 170 key:value items that represent currency exchange rates. Now I would like to loop that Object and manipulate the value items.

My idea is to

    1. change the decimal number to 5
    1. replace the existing "." with a "comma"
    1. add thousand separators (".") to any value where the figure before the decimals is
      >= 1.000

Final output should look like e.g.

"BIF": 2088.228311 -->2.088,22831.

The formula for the separator is from this thread which works pretty fine in a different project of mine: How to print a number with commas as thousands separators in JavaScript

Somehow my attempt shown below directly ends up in a SO error.

Any advice is highly appreciated :-) Thank you in advance!

let rates = {
        "AED": 4.07055,
		"AFN": 87.352472,
		"ALL": 123.333245,
		"AMD": 531.538368,
		"ANG": 1.931339,
		"AOA": 538.65376,
		"ARS": 66.131175,
		"AUD": 1.605893,
		"AWG": 1.994881,
		"AZN": 1.885024,
		"BAM": 1.95844,
		"BBD": 2.247575,
		"BDT": 94.335008,
		"BGN": 1.956646,
		"BHD": 0.417802,
		"BIF": 2088.228311,
		"BMD": 1.108267,
		"BND": 1.510167,
		"BOB": 7.697558,
		"BRL": 4.425866,
		"BSD": 1.113173,
		"BTC": 0.000118,
		"BTN": 78.682856,
		"BWP": 12.073536,
		"BYN": 2.272208,
		"BYR": 21722.032491,
}

Object.values(rates).forEach((value) => {
  .toFixed(5);
  .replace(/\B(?=(\d{3})+(?!\d))/g, ".");
  console.log(rates);
});

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Answer

Pleas note you cannot change the original rates-object in a forEach-loop (take a look here). Also better use standartized tools to format numbers instead of implementing your own workarounds (take a look here) 

let rates = {
    "AED": 4.07055,
		"AFN": 87.352472,
		"ALL": 123.333245,
		"AMD": 531.538368,
		"ANG": 1.931339,
		"AOA": 538.65376,
		"ARS": 66.131175,
		"AUD": 1.605893,
		"AWG": 1.994881,
		"AZN": 1.885024,
		"BAM": 1.95844,
		"BBD": 2.247575,
		"BDT": 94.335008,
		"BGN": 1.956646,
		"BHD": 0.417802,
		"BIF": 2088.228311,
		"BMD": 1.108267,
		"BND": 1.510167,
		"BOB": 7.697558,
		"BRL": 4.425866,
		"BSD": 1.113173,
		"BTC": 0.000118,
		"BTN": 78.682856,
		"BWP": 12.073536,
		"BYN": 2.272208,
		"BYR": 21722.032491
}

for(key in rates) {
  rates[key] = new Intl.NumberFormat('de-DE', {
    minimumFractionDigits: 5,
    maximumFractionDigits: 5
  }).format(rates[key]);
   
}
console.log(rates);

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source: stackoverflow.com
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