I don’t know Ruby at all just wondering what this line specifically is doing

bitrate = params[:bitrate] =~ /\A\d k\z/ ? params[:bitrate] : '3000k'

It appears to be validating the input but I’m not sure about the last colon

Just wondering what the code does specifically in plain English

CodePudding user response：

You're seeing the ternary operator in use. It has the form:

expr ? expr-when-true : expr-when-false

The first condition is evaluated in a boolean context, so anything that's treated as true will yield the first result. Otherwise, the second.

In Ruby you could also write as a one-liner:

bitrate = if params[:bitrate] =~ /\A\d k\z/ then params[:bitrate] else '3000k' end