Node.js REPL with lodash
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?
$ npm install -g n_
$ 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_ >
Use lodash's functional programming variant lodash/fp:
$ n_ --fp
n_ > _.map(function(v) { return v * 2; }, [1, 2, 3]);
[ 2, 4, 6 ]
n_ >
Enable strict mode:
$ n_ --use_strict
n_ >
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 useUse .lodash help to view the available repl commands within the repl.
__ as last evaluated expressionThe 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'
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: