字符串的创建
普通创建
Ruby中使用**” “或‘ ‘符号来创建字符串,在字符串中也可以包含表达式#{}**,这个表达式被称之为内嵌表达式。如果字符串中需要包含””或者’’等字符时,则可以通过转义字符\来实现。
1 | str = "this is a string" |
Ruby中使用**” “或‘ ‘符号来创建字符串,在字符串中也可以包含表达式#{}**,这个表达式被称之为内嵌表达式。如果字符串中需要包含””或者’’等字符时,则可以通过转义字符\来实现。
1 | str = "this is a string" |
Octopress was broken after I upgraded Mac to OS X EI Capitan 10.11.1 in these days. The details of the problem is below.
Octopress is work well in Mac10.10. but when I upgraded to Mac10.11.1(OS X EI Capitan). And put rake preview in terminal to see the blog what looks like, got following error.
Starting to watch source with Jekyll and Compass. Starting Rack on port 4000
rake aborted!
Errno::ENOENT: No such file or directory - compass
/Users/user/git/octopress/Rakefile:85:in spawn
/Users/user/git/octopress/Rakefile:85:in block in <top (required)>
Tasks: TOP => preview
(See full trace by running task with --trace)
根据指定规则替换数组中的元素,Ruby也提供了以下方法:
ary.collect { |item| …}
ary.collect! { |item| …}
ary.map { |item| …}
ary.map! { |item| …}
将数组ary中的各元素item传递给块做处理。
1 | ary = [1, 2, 3] |