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

It is possible to 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

It is possible to enable strict mode in Node.js >= 4.x:

$ n_ --use_strict
n_ >

Notes

Special character _

The behavior of assigning _ to the last evaluated expression is disabled, since lodash is already assigned to _.

History persistence

n_ stores its session history under ~/.n_repl_history.

Enjoy!