Function first

配列の先頭の要素を返す

Example

first([1, 2, 3]); // 1
  • first<T extends unknown[]>(
        array: T,
    ): First<T> extends never ? undefined | T[number] : First<T>

    Type Parameters

    • T extends unknown[]

    Parameters

    • array: T

      配列

    Returns First<T> extends never ? undefined | T[number] : First<T>

    配列の先頭の要素

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