CODEWITHSUNDEEP
javascriptarraysmatrix
Kousha
Kousha

Reputation: 36229

Quickest/most elegant way to verify a 2D array has same length per row?

Let's say I have a 2D array:

const matrixRegular = [
    ['a', 'b', 'c'],
    ['e', 'f', 'g'],
];

Let's say I want to verify that every row in this matrix has the same length, so the example above is a valid matrix, but the example below is not:

const matrixIrregular = [
    ['a', 'b', 'c'],
    ['e', 'f']
];

What's a clean/elegant way of doing it? This is the one-liner I have:

const isRegularMatrix = matrix => new Set(data.map(row => row.length)).size === 1

Convert the matrix to an array of just row length, then use Set to ensure every element is a duplicate (same length), hence it comes out with size 1.

Upvotes: 2

Views: 617

Answers (1)

Maheer Ali
Maheer Ali

Reputation: 36584

You can use every() and compare length of each array with the length of the first.

const isRegularMatrix = matrix => matrix.every(x => x.length === matrix[0].length)

Upvotes: 13

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