如何在irb提示符中很好地打印一個大的變量?我有一個包含許多變量的變量,打印輸出變得亂七八糟。如果我只是想要不帶它們的值的變量名?或者,我可以在單獨的一行上打印每一個,根據深度標籤?IRB和大變量?
Q
IRB和大變量?
2
A
回答
4
或者,我可以在一個單獨的行上打印每一個,根據深度標籤?
採用PP(代碼):
require 'pp'
very_long_hash = Hash[(1..23).zip(20..42)]
pp very_long_hash
# Prints:
{1=>20,
2=>21,
3=>22,
4=>23,
5=>24,
6=>25,
7=>26,
8=>27,
9=>28,
10=>29,
11=>30,
12=>31,
13=>32,
14=>33,
15=>34,
16=>35,
17=>36,
18=>37,
19=>38,
20=>39,
21=>40,
22=>41,
23=>42}
2
如果你想要的東西,甚至比 「漂亮」 打印更真棒,你可以使用"awesome" print。對於真正的間隔體驗,在你的IRB上灑上一些hirbal medicine!
Hirb,例如,渲染ActiveRecord對象(或幾乎任何數據庫訪問庫)作爲實際的ASCII表:
+-----+-------------------------+-------------+-------------------+-----------+-----------+----------+
| id | created_at | description | name | namespace | predicate | value |
+-----+-------------------------+-------------+-------------------+-----------+-----------+----------+
| 907 | 2009-03-06 21:10:41 UTC | | gem:tags=yaml | gem | tags | yaml |
| 906 | 2009-03-06 08:47:04 UTC | | gem:tags=nomonkey | gem | tags | nomonkey |
| 905 | 2009-03-04 00:30:10 UTC | | article:tags=ruby | article | tags | ruby |
+-----+-------------------------+-------------+-------------------+-----------+-----------+----------+