Function is2DArray

is2DArray(x: unknown): x is unknown[][]
Determines whether the provided value is a two-dimensional array.
Parameters
- x: unknown
  The value to validate.
Returns x is unknown[][]
true if the value is a two-dimensional array.
Remarks
A value is considered a 2D array if:
- it is an array
- every element is also an array
The inner array element types are not validated.

Examples

Value Result

[] false

[[]] true

[[1, 2], [3]] true

[['a'], [1]] true

[1, 2, 3] false

{} false

null false
Impl Note
- Empty two-dimensional array are considered valid.
- Inner arrays may contain values of any type.
- This function checks only array nesting depth, not contents.
Since
1.1

See
isMatrix
- Defined in builtins/array.ts:603