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I'm trying to do Ruby password input with the Highline gem and since I have the user input the password twice, I'd like to eliminate the duplication on the blocks I'm passing in. For example, a simple version of what I'm doing right now is:
new_pass = ask("Enter your new password: ") { |prompt| prompt.echo = false } verify_pass = ask("Enter again to verify: ") { |prompt| prompt.echo = false } And what I'd like to change it to is something like this:
foo = Proc.new { |prompt| prompt.echo = false } new_pass = ask("Enter your new password: ") foo verify_pass = ask("Enter again to verify: ") foo Which unfortunately doesn't work. What's the correct way to do this?
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A block is always invoked with a function or can say passed to a method call. To call a block within a method with a value, yield statement is used. Blocks can be called just like methods from inside the method that it is passed to.
A Proc object is an encapsulation of a block of code, which can be stored in a local variable, passed to a method or another Proc, and can be called. Proc is an essential concept in Ruby and a core of its functional programming features.
In Ruby, all arguments are required when you invoke the method. You can't define a method to accept a parameter and call the method without an argument. Additionally, a method defined to accept one parameter will raise an error if called with more than one argument.
In the code you posted, *args simply indicates that the method accepts a variable number of arguments in an array called args . It could have been called anything you want (following the Ruby naming rules, of course).
The code by David will work fine, but this is an easier and shorter solution:
foo = Proc.new { |prompt| prompt.echo = false } new_pass = ask("Enter your new password: ", &foo) verify_pass = ask("Enter again to verify: ", &foo) You can also use an ampersand to assign a block to a variable when defining a method:
def ask(msg, &block) puts block.inspect end If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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