Multidimensional arrays

Learn to define nested arrays.

Multidimensional arrays

A multidimensional array is a structure where an array contains other arrays. The nested array type is written as number[][], meaning "an array of number arrays". It is used for matrix or table-like data.

let matris: number[][] = [
    [1, 2, 3],
    [4, 5, 6]
];
console.log(matris[0][1]);  // 2

Accessing nested elements

To access an element in nested arrays, two brackets are used. matris[0] gives the first row, and matris[0][1] gives the second element of the first row. TypeScript type-checks even when rows and columns differ in count.

let tablo: string[][] = [
    ["ad", "soyad"],
    ["Ali", "Yılmaz"]
];
console.log(tablo[1][0]);  // "Ali"

Exercise Number matrix

Define a 2x3 matrix named matris of type number[][]: first row [1, 2, 3], second row [4, 5, 6]. Then print the second row with console.log.

Show example solution

let matris: number[][] = [
    [1, 2, 3],
    [4, 5, 6]
];
console.log(matris[1]);

Test yourself

What does the `string[][]` type express?
- An outer array whose each element is a string array
- A single string value
- A readonly string array
- A fixed set of two strings
Show answer

An outer array whose each element is a string array — `string[][]` defines an outer array whose each element is a `string[]`; this creates nested string arrays.

Write a nested array type

let koordinatlar: number____ = [[0, 0], [3, 4]];

Show answer

let koordinatlar: number[][] = [[0, 0], [3, 4]];

Multidimensional concepts

number[][]

A number matrix
string[][]

A string table
matris[0]

The first row
matris[0][1]

The second element of the first row

Next lesson: Summary - Arrays

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