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showing results for - "reach to each cell in 2d array javascript"

Elena

01 Jun 2018

```
1// ... Matrix declaration goes here
2
3function getCell(matrix, y, x) {
4 var NO_VALUE = null;
5 var value, hasValue;
6
7 try {
8 hasValue = matrix[y][x] !== undefined;
9 value = hasValue? matrix[y][x] : NO_VALUE;
10 } catch(e) {
11 value = NO_VALUE;
12 }
13
14 return value;
15}
16
17function surroundings(matrix, y, x) {
18 // Directions are clockwise
19 return {
20 up: getCell(matrix, y-1, x),
21 upRight: getCell(matrix, y-1, x+1),
22 right: getCell(matrix, y, x+1),
23 downRight: getCell(matrix, y+1, x+1),
24 down: getCell(matrix, y+1, x),
25 downLeft: getCell(matrix, y+1, x-1),
26 left: getCell(matrix, y, x-1),
27 upLeft: getCell(matrix, y-1, x-1)
28 }
29}
```

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