Underscore: ReferenceError: _ is not defined

Created on 26 Jan 2018 · 5Comments · Source: jashkenas/underscore

After having some trouble installing underscore (because it's not underscore.js but only underscore), I try to use a underscore function (_.once) but I get this error, I have const Underscore = require("underscore") on the top of my code, but still, and when I try const Underscore = require("underscore.js") it doesn't find the modul, so you could please enlighten me ?

I'm a reall beginner at JavaScript, forgive me if I do something obviously wrong ;p

Source

Francefire

Most helpful comment

Your code assigns the underscore library to a constant named Underscore.
What I think you want is: const _ = require("underscore"); which will assign the underscore library to a constant named _.

Rayraz on 27 Jan 2018

👍9 ❤7 🚀1

All 5 comments

Rayraz on 27 Jan 2018

👍9 ❤7 🚀1

Omg thanks, since I didn't take any lesson of javascript I wasn't understanding what did this command really means, but now I got it, thanks :D

Francefire on 27 Jan 2018

Your code assigns the underscore library to a constant named Underscore.
What I think you want is: const _ = require("underscore"); which will assign the underscore library to a constant named _.

Was looking this for hours...

olivier-voutat on 25 Sep 2018

Your code assigns the underscore library to a constant named Underscore.
What I think you want is: const _ = require("underscore"); which will assign the underscore library to a constant named _.

Thank you. this works when you are working on react application also.

naveenkumargc on 29 May 2019

Your code assigns the underscore library to a constant named Underscore.
What I think you want is: const _ = require("underscore"); which will assign the underscore library to a constant named _.

thnx a lot