Can anyone help me with npm --prefix?

Question

I'm stuck with npm --prefix. I'm trying to prefix my frontend folder so I can run both the backend and frontend at the same time.

I keep getting an error with the wrong pathway: \backend\frontend/package.json.

Can anyone help me with that?

{
      "name": "backend",
      "version": "1.0.0",
      "description": "User Authentication APP - MERN stack",
      "main": "server.js",
      "scripts": {
        "start": "node backend/server.js",
        "server": "nodemon backend/server.js",
        "client": "npm start --prefix frontend ",
        "dev": "concurrently \"npm run server\" \"npm run client\""
      }
    }

Answer 1

You can do that using Numpy and list comprehension, which is faster than a for loop:

import numpy as np
a=np.array([[0,1,2,3,4],[5,6,7,8,9],[10,11,12,13,14],[15,16,17,18,19]])
coor=[(0,1),(3,4),(1,2)]
myList=[a[c] for c in coor]
print(myList)

Answer 2

Use np.transpose to transform coor variable:

m = np.array(a)
myList = m[tuple(np.transpose(coor))].tolist()

Output:

>>> myList
[1, 19, 7]

>>> np.transpose(coor)
array([[0, 3, 1],
       [1, 4, 2]])

Answer 3

Check

[np.array(a)[x] for x in coor]
Out[201]: [1, 19, 7]