n_ v4.0.1
n_
Node.js REPL with lodash
Why?
Sometimes we use the Node.js REPL interface to experiment with code. Wouldn’t it be great to have that interface with lodash required by default?
Installation
$ npm install -g n_
Usage
$ n_
n_ >
lodash is now attached to the REPL context as _
, so just use it:
n_ > _.compact([0, 1, false, 2, '', 3]);
[ 1, 2, 3 ]
n_ >
FP mode
Use lodash's functional programming variant lodash/fp
:
$ n_ --fp
n_ > _.map(function(v) { return v * 2; }, [1, 2, 3]);
[ 2, 4, 6 ]
n_ >
Strict mode
Enable strict mode:
$ n_ --use_strict
n_ >
Repl specificities
Commands
Commands which facilitate changing the lodash flavor can be executed with the .lodash
repl command:
.lodash fp
: switch to lodash/fp.lodash vanilla
: switch to vanilla lodash mode.lodash reset
: switch to initial lodash mode.lodash swap
: switch to the other lodash mode (vanilla/fp).lodash current
: output current lodash flavor in use.lodash version
: output lodash version in use
Use .lodash help
to view the available repl commands within the repl.
__
as last evaluated expression
The special character _
refers to the lodash instance, and cannot hold the value of the last expression.
Use __
to access the last expression instead:
n_ > 10 + 2
12
n_ > 'number ' + __
'number 12'
Configuration options
Aside from --fp
and --use_strict
/--use-strict
, other options are available either as CLI flags or via environment variables (with a trailing _N_
).
Available cli options can be viewed with:
n_ --help
Enjoy! :rocket:
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