Write code for a 2D array.

🟢 Easy Coding Fresher level

1Times asked

Apr 2026Last seen

Apr 2026First seen

💡 Model Answer

A 2D array is a collection of arrays arranged in rows and columns. In JavaScript you can create it with nested arrays:

const matrix = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];

// Access element at row 1, column 2 (0‑based indexing)
const value = matrix[1][2]; // 6

In Python it looks similar:

python

matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]
value = matrix[1][2]  # 6

You can iterate over rows and columns with nested loops:

for (let i = 0; i < matrix.length; i++) {
  for (let j = 0; j < matrix[i].length; j++) {
    console.log(matrix[i][j]);
  }
}

Complexity for accessing an element is O(1). Creating the matrix is O(n*m) where n is the number of rows and m the number of columns.

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