diff --git a/codewars/6kyu/decimals-or-groups-of-thousands/koronya.js b/codewars/6kyu/decimals-or-groups-of-thousands/koronya.js
new file mode 100644
index 000000000..c96e2bfdc
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+++ b/codewars/6kyu/decimals-or-groups-of-thousands/koronya.js
@@ -0,0 +1,27 @@
+// [JS][6kyu] Decimals or groups of thousands??
+// decimals-or-groups-of-thousands
+// https://www.codewars.com/kata/58379c3b51e3b680aa000164/train/javascript
+
+const US_REGEX = /^\d{1,3}(,\d{3})*(\.\d+)?$|^\d+(\.\d+)?$/
+const EU_REGEX = /^\d{1,3}(\.\d{3})*(,\d+)?$|^\d+(,\d+)?$/
+
+const isUsNumber = (str) => US_REGEX.test(str)
+const isEuNumber = (str) => EU_REGEX.test(str)
+const getNumber = (str) => {
+  if (isUsNumber(str)) {
+    return parseFloat(str.replace(/,/g, ''))
+  } else if (isEuNumber(str)) {
+    return parseFloat(str.replace(/\./g, '').replace(/,/g, '.'))
+  }
+}
+
+const sumUpNumbers = (arr) => {
+  const sum = arr.map(getNumber).reduce((acc, cur) => acc + cur, 0)
+  return sum.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })
+}
+
+sumUpNumbers(['1,234.34', '1.324,2', '14']) === '2,572.54'
+sumUpNumbers(['4.44', '8', '14,56']) === '27.00'
+sumUpNumbers(['4.4', '8.234,1', '14,56']) === '8,253.06'
+sumUpNumbers(['4,444,999', '8.234,1', '14,56']) === '4,453,247.66'
+sumUpNumbers(['424', '8.234,1', '14,56']) === '8,672.66'