d = [2,4,6]
d.collect{ |i| i * 2 } #=> [4,8,12]
I tried to do the same with multi-dimensional array
我试图用多维数组做同样的事情
d = [[1,3],[2,4]]
d.collect { |i,j| i*2, j*2 } #=> getting syntax error
1 个解决方案
#1
2
To represent array, you need to surround them with [ and ]:
要表示数组,您需要用[和]包围它们:
d.collect { |i,j| [i*2, j*2] }
# ^ ^
# => [[2, 6], [4, 8]]
#1
2
To represent array, you need to surround them with [ and ]:
要表示数组,您需要用[和]包围它们:
d.collect { |i,j| [i*2, j*2] }
# ^ ^
# => [[2, 6], [4, 8]]