Multidimensional

Swift Arrays: Multidimensional

Use nested arrays to represent 2D (or higher) structures such as matrices and grids.

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2D Arrays

Store rows as arrays inside an outer array, then index as grid[row][col] to access items.

Example

var grid = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
]
print(grid[0][1]) // 2
for row in grid {
  print(row)
}

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Update a Cell

Change a value by indexing into the specific row and column.

Example

var grid = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
]
grid[1][1] = 99
print(grid[1])      // [4, 99, 6]
print(grid[1][1])   // 99