kalasoo (Ming)

Array of Array Appending

kalasoo — Tue, 29 Apr 2014 20:00:54 +0800

# Just found an interesting stuff

x = [[]] * 4    # [[], [], [], []]
x[0] << 1       # or x[0] .push 1
# => [[1], [1], [1], [1]]

x = [[]] * 4    # [[], [], [], []]
# just append an element to the first array of x

update：

x = [[], [], [], []]
x[0] << 1
# => [[1], [], [], []]

kalasoo — Sun, 13 Apr 2014 21:47:54 +0800

第一次用到 rjs 觉得很方便好用，但是又看到了Do not use RJS-like techniques，心里面就比较困惑了。

我不知道到底有没有什么大的问题，诚心求教。