Is there a ruby console equivalent to Swift/Obj-C/iOS?

Question

One of the best ways for me to work with Ruby was handling data in real time. In the debugger, I could set new variables, assign them, and manipulate the code.

Is this possible in xCode's Swift/Obj-C? It seems when I try to instantiate new variables, they are never accessible. Perhaps my syntax is wrong?

>> po let my_numb = 5
>> po my_numb

error: <EXPR>:1:1: error: use of unresolved identifier 'my_numb'

you can edit existing variables and interrogate data but you can't inject arbitrary code like that, what example situation are you trying to deal with, it seems like a playground may be what you're looking for — Wain
– Wain, Commented Apr 4, 2016 at 10:52
I agree with @Wain. If you just want to toy around with some code and see the outcome straight away playgrounds are an excellent way to do so — pbodsk
– pbodsk, Commented Apr 4, 2016 at 11:12

Community · Accepted Answer · 2017-05-23 11:45:06Z

2

The (LLDB) debugger is not really a Swift REPL but you can create convenience variables there, however they have to be prefixed with $:

expr var $foo: Int = 10 
p $foo

Also see Martin R's answer about entering REPL from the debugger:

(lldb) repl                  // enter REPL
(lldb) let my_numb: Int = 10 // create Swift variable
(lldb) :                     // exit REPL
(lldb) p my_numb             // print variable

(Int) $R0 = 10

edited May 23, 2017 at 11:45

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answered Apr 4, 2016 at 11:20

Sulthan

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1 Comment

Martin R Over a year ago

You can also enter the Swift REPL from within the debugger (and return to lldb again).

Dan Halliday · Accepted Answer · 2016-04-04 10:53:08Z

1

For Swift, you can use the Swift REPL, which is exactly like IRB for Ruby.

~~You'll need to install Swift separately from the Xcode tools. Instructions to do that can be found here: https://swift.org/getting-started/#installing-swift~~. The Swift REPL is installed along with Xcode.

answered Apr 4, 2016 at 10:53

Dan Halliday

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2 Comments

Trip Over a year ago

A fascinating. Does this work alongside a running app though? Can I use this with a debugger?

Dan Halliday Over a year ago

No, this is purely a read-eval-print loop. But the REPL can be started from inside the LLDB debugger as stated by @Sulthan.

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