Type Alias NonEmptyArray<T>

NonEmptyArray: [T, ...T[]]

Represents an array that must contain at least one element.

Type Parameters

T
Element type.

Since

0.14.0

Example

function first<T>(arr: NonEmptyArray<T>): T {
    return arr[0]; // safe — at least one element is always present
}

first([1, 2, 3]); // OK
first([]);        // Error: not assignable to NonEmptyArray