diff --git a/codewars/6kyu/city-surface-area/koronya.js b/codewars/6kyu/city-surface-area/koronya.js
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+// [JS][6kyu] City Surface Area
+// city-surface-area
+// https://www.codewars.com/kata/693e7afc20e67d6a9ebdac5a/train/javascript
+
+const getNormalSurfaceArea = (height) => height * 4 + 1
+const getMin = (height1, height2) => Math.min(height1, height2)
+const getValidSurroundingPositionsHeight = (x, y, map) => {
+  const positions = []
+  const directions = [
+    [0, 1],
+    [1, 0],
+    [0, -1],
+    [-1, 0],
+  ]
+
+  directions.forEach(([dx, dy]) => {
+    const newX = x + dx
+    const newY = y + dy
+    if (newX >= 0 && newX < map.length && newY >= 0 && newY < map[0].length) {
+      positions.push([newX, newY])
+    }
+  })
+
+  return positions.map(([newX, newY]) => map[newX][newY])
+}
+
+const citySurfaceArea = (_map) => {
+  let result = 0
+  _map.forEach((row, rowIndex) => {
+    row.forEach((height, colIndex) => {
+      const baseValue = getNormalSurfaceArea(height)
+      const surroundingHeights = getValidSurroundingPositionsHeight(rowIndex, colIndex, _map)
+      const minusValue = surroundingHeights.reduce((acc, h) => acc + getMin(height, h), 0)
+      result += baseValue - minusValue
+    })
+  })
+  return result
+}
+
+// citySurfaceArea([
+//   [4, 2, 0],
+//   [2, 1, 2],
+//   [0, 2, 4],
+// ])
+
+// citySurfaceArea([[1, 2, 3]])
+
+// citySurfaceArea([
+//   [1, 0, 1],
+//   [0, 1, 0],
+//   [1, 0, 1],
+// ])