Function findNextUpperOrLowerCase

find either the next upper or next lower case character index in string str, based on the numeric option, starting from index start and optionally ending at exclusive-index end. if your selected uppercase/lowercase option is not found, or if your option === 0, then undefined is returned.

this function is just a composition of the functions findNextUpperCase and findNextLowerCase.

  • findNextUpperOrLowerCase(
        str: string,
        option: -1 | 1,
        start?: number,
        end?: undefined | number,
    ): undefined | number

    Parameters

    • str: string
    • option: -1 | 1
    • start: number = 0
    • end: undefined | number = undefined

    Returns undefined | number

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