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Contents
import type {IsEqual, Subtract} from './internal';
type Recursive<T> = ReadonlyArray<Recursive<T>>;
/**
Creates a type that represents a multidimensional readonly array that of the given type and dimension.
Use-cases:
- Return a n-dimensional array from functions.
- Declare a n-dimensional array by defining its dimensions rather than declaring `[]` repetitively.
- Infer the dimensions of a n-dimensional array automatically from function arguments.
- Avoid the need to know in advance the dimensions of a n-dimensional array allowing them to be dynamic.
@example
```
import type {MultidimensionalReadonlyArray} from 'type-fest';
function emptyMatrix<T extends number>(dimensions: T): MultidimensionalReadonlyArray<unknown, T> {
const matrix: unknown[] = [];
let subMatrix = matrix;
for (let dimension = 1; dimension < dimensions; ++dimension) {
console.log(`Initializing dimension #${dimension}`);
subMatrix[0] = [];
if (dimension < dimensions - 1) {
subMatrix = subMatrix[0] as unknown[];
} else {
subMatrix[0] = 42;
}
}
return matrix as MultidimensionalReadonlyArray<unknown, T>;
}
const matrix = emptyMatrix(3);
const answer = matrix[0][0][0]; // 42
```
@category Array
*/
export type MultidimensionalReadonlyArray<Element, Dimensions extends number> = number extends Dimensions
? Recursive<Element>
: IsEqual<Dimensions, 0> extends true
? Element
: ReadonlyArray<MultidimensionalReadonlyArray<Element, Subtract<Dimensions, 1>>>;
Version data entries
33 entries across 33 versions & 1 rubygems