ruby - 循环遍历 ruby​​ 中的二维数组以表格格式显示它？

Question

我如何在终端中以表格格式表示二维数组，它像表格一样正确排列列？

看起来像这样:

         1       2       3          4          5
   1 [ Infinity | 40 | 45       | Infinity | Infinity ]
   2 [ Infinity | 20 | 50       | 14       | 20 ]
   3 [ Infinity | 30 | 40       | Infinity | 40 ]
   4 [ Infinity | 28 | Infinity | 6        | 6 ]
   5 [ Infinity | 40 | 80       | 12       | 0 ]

代替:

[ Infinity,40,45,Infinity,Infinity ]
[ Infinity,20,50,14,20 ]
[ Infinity,30,40,Infinity,40 ]
[ Infinity,28,Infinity,6,6 ]
[ Infinity,40,80,12,0 ]

Answer 1

a = [[Infinity, 40, 45, Infinity, Infinity],
    [Infinity, 20, 50, 14, 20 ],
    [Infinity, 30, 40, Infinity, 40 ],
    [Infinity, 28, Infinity, 6, 6 ],
    [Infinity, 40, 80, 12, 0 ]]

分步说明

您首先需要达到列宽。下面的 col_width 是一个数组，它给出了每列的宽度。

col_width = a.transpose.map{|col| col.map{|cell| cell.to_s.length}.max}

然后，这将为您提供表格的主要部分:

a.each{|row| puts '['+
 row.zip(col_width).map{|cell, w| cell.to_s.ljust(w)}.join(' | ')+']'}

要给出标签，请执行以下操作。

puts ' '*(a.length.to_s.length + 2)+
    (1..a.length).zip(col_width).map{|i, w| i.to_s.center(w)}.join('   ')

a.each_with_index{|row, i| puts "#{i+1} ["+
    row.zip(col_width).map{|cell, w| cell.to_s.ljust(w)}.join(' | ')+
    ']'
}

All in One 这是针对 ruby​​1.9 的。稍作修改即可使其在 ruby​​ 1.8 上运行。

a
.transpose
.unshift((1..a.length).to_a)   # inserts column labels #
.map.with_index{|col, i|
    col.unshift(i.zero?? nil : i)   # inserts row labels #
    w = col.map{|cell| cell.to_s.length}.max   # w = "column width" #
    col.map.with_index{|cell, i|
         i.zero?? cell.to_s.center(w) : cell.to_s.ljust(w)}   # alligns the column #
}
.transpose
.each{|row| puts "[#{row.join(' | ')}]"}