repl: make last error available as _error
#18919
Conversation
doc/api/repl.md
Outdated
| @@ -162,6 +162,17 @@ Expression assignment to _ now disabled. | |||
| 4 | |||
| ``` | |||
|
|
|||
| Similarly, `_err` will refer to the last seen error, if there was any. | |||
There was a problem hiding this comment.
Is there any way we could add a Changes section for this?
|
Would it be a good idea to make it something... less likely to conflict? |
|
@Fishrock123 How would |
BridgeAR
added
the
author ready
|
Love the idea, needs a better name. Two underscores is better than one and would prefer something like |
|
@jasnell I think the main goal for the name is that it’s supposed to be typable really, really easily and quickly. I love verbose names in real code, because we’re writing it for the 100 readers coming after us, but the REPL has the exact opposite goal of that: It’s code that’s only written once, ever, and never read by anybody else more than a minute after it was written. It’s not about choosing good or descriptive variable names in any way, it’s about being easy to write, so I would really prefer to keep it short and succinct. (Literally all REPLs that I know of use The only thing I’m worried about here is discoverability, because right now you’d have to hear about it somewhere or read the docs. I’ve gone with I’m also not worried about collisions; there is an explicit warning text being emitted here if that happens, like it is for |
addaleax
removed
the
author ready
|
@addaleax ... then how about meeting in the middle with |
addaleax
force-pushed
the
repl-last-error
branch
from
0bb0ec2 to
1aaf085
Compare
|
@jasnell I’m fine with that, but honestly, I’m just going to write I’ve switched it for now but it might be helpful to know what your concerns actually are. |
|
The concern is that I'm not particularly fond of abbreviated things. |
|
How about |
This is pretty useful when trying to inspect the last error caught by a REPL, and is made to be analogous to `_`, which contains the last successful completion value.
addaleax
changed the title
_err_error
addaleax
force-pushed
the
repl-last-error
branch
from
1aaf085 to
1867690
Compare
|
@TimothyGu I think @jasnell would want that to be |
BridgeAR
added
the
author ready
|
It seems like the CI run here was started for a different PR. |
|
Landed in a8b5192 |
addaleax
removed
the
author ready
This is pretty useful when trying to inspect the last error caught by a REPL, and is made to be analogous to `_`, which contains the last successful completion value. PR-URL: #18919 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Evan Lucas <[email protected]> Reviewed-By: Vladimir de Turckheim <[email protected]> Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Tobias Nießen <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Prince John Wesley <[email protected]> Reviewed-By: Shingo Inoue <[email protected]>
This is pretty useful when trying to inspect the last error caught by a REPL, and is made to be analogous to `_`, which contains the last successful completion value. PR-URL: nodejs#18919 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Evan Lucas <[email protected]> Reviewed-By: Vladimir de Turckheim <[email protected]> Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Tobias Nießen <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Prince John Wesley <[email protected]> Reviewed-By: Shingo Inoue <[email protected]>
|
Should this be backported to |
addaleax
added
the
semver-minor
This is pretty useful when trying to inspect the last error caught by a REPL, and is made to be analogous to `_`, which contains the last successful completion value. PR-URL: nodejs#18919 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Evan Lucas <[email protected]> Reviewed-By: Vladimir de Turckheim <[email protected]> Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Tobias Nießen <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Prince John Wesley <[email protected]> Reviewed-By: Shingo Inoue <[email protected]>
This is pretty useful when trying to inspect the last
error caught by a REPL, and is made to be analogous to
_,which contains the last successful completion value.
Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passesAffected core subsystem(s)
repl