/**
 * 把有序数字数组按连续分组
 * [0,1,2,5,6,9] => [
 *     [0,1,2],
 *     [5,6],
 *     [9]
 * ]
 * @param numbers 数字数组
 * @param onlyRange 是否只返回范围（[[0,1,2,3]] => [[0,3]]）
 */
export function groupNumber(numbers: number[], onlyRange?: boolean): number[][] {
    let result = numbers.reduce((r: any, n) => {
        const lastSubArray = r[r.length - 1]

        if (!lastSubArray || lastSubArray[lastSubArray.length - 1] !== n - 1) {
            r.push([])
        }

        r[r.length - 1].push(n)
        return r
    }, [])

    if (onlyRange) {
        result = result.map((x: any) => [x[0], x[x.length - 1]])
    }
    return result
}