
MBrooks
Programming Clojure, Third Edition: "import" for MidiNote protocol does not work (page 186)
On page 186 (last page of chapter 7) it says “The first thing we need to do is import (not use or require) our MidiNote protocol from the examples.midi namespace”.
I could not find a reason for why import, rather than use or require, should be used in this case. I am very new to Clojure but as far as I can tell, “import” is used only for importing Java classes.
When I tried using generator.clj from the REPL by running:
user=> (require '[examples.generator :refer :all])
, the “import” did not work: I got the following error:
CompilerException java.lang.ClassNotFoundException: examples.midi.MidiNote, compiling:(examples/generator.clj:11:1)
I removed the import statement and added the following require to the ns
statement at the top of generator.clj
:
(:require [examples.midi :refer [MidiNote key-number perform to-msec]])
After this change I was able to run generator.clj from the REPL successfully.
Popular Pragmatic Bookshelf topics

I ran this command after installing the sample application:
$ cards add do something --owner Brian
And got a file not found error:
Fil...
New

I’m new to Rust and am using this book to learn more as well as to feed my interest in game dev. I’ve just finished the flappy dragon exa...
New

I’m running Android Studio “Arctic Fox” 2020.3.1 Patch 2, and I’m embarrassed to admit that I only made it to page 8 before running into ...
New

I think I might have found a problem involving SwitchCompat, thumbTint, and trackTint.
As entered, the SwitchCompat changes color to hol...
New

Is the book’s epub format available to read on Google Play Books?
New

Hi,
I completed chapter 6 but am getting the following error when running:
thread 'main' panicked at 'Failed to load texture: IoError(O...
New

Is there any place where we can discuss the solutions to some of the exercises? I can figure most of them out, but am having trouble with...
New

Hi,
I am getting an error I cannot figure out on my test.
I have what I think is the exact code from the book, other than I changed “us...
New

Modern Front-End Development for Rails - application does not start after run bin/setup (page xviii)
After some hassle, I was able to finally run bin/setup, now I have started the rails server but I get this error message right when I vis...
New

@mfazio23
Android Studio will not accept anything I do when trying to use the Transformations class, as described on pp. 140-141. Googl...
New
Other popular topics

SpaceVim seems to be gaining in features and popularity and I just wondered how it compares with SpaceMacs in 2020 - anyone have any thou...
New

We have a thread about the keyboards we have, but what about nice keyboards we come across that we want? If you have seen any that look n...
New

Rust is an exciting new programming language combining the power of C with memory safety, fearless concurrency, and productivity boosters...
New

Hello content creators! Happy new year. What tech topics do you think will be the focus of 2021? My vote for one topic is ethics in tech...
New

Seems like a lot of people caught it - just wondered whether any of you did?
As far as I know I didn’t, but it wouldn’t surprise me if I...
New

API 4
Path:
/user/following/
Method:
GET
Description:
Returns the list of all names of people whom the user follows
Response
[
{ ...
New

I am trying to crate a game for the Nintendo switch, I wanted to use Java as I am comfortable with that programming language. Can you use...
New

Author Spotlight
Mike Riley
@mriley
This month, we turn the spotlight on Mike Riley, author of Portable Python Projects. Mike’s book ...
New

Author Spotlight
Rebecca Skinner
@RebeccaSkinner
Welcome to our latest author spotlight, where we sit down with Rebecca Skinner, auth...
New

Large Language Models like ChatGPT say The Darnedest Things.
The Errors They MakeWhy We Need to Document Them, and What We Have Decided ...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /ruby
- /wasm
- /erlang
- /phoenix
- /keyboards
- /rails
- /js
- /python
- /security
- /go
- /swift
- /vim
- /clojure
- /emacs
- /java
- /haskell
- /onivim
- /svelte
- /typescript
- /crystal
- /c-plus-plus
- /kotlin
- /tailwind
- /gleam
- /ocaml
- /react
- /elm
- /flutter
- /vscode
- /ash
- /opensuse
- /centos
- /php
- /deepseek
- /html
- /scala
- /zig
- /textmate
- /sublime-text
- /nixos
- /debian
- /lisp
- /agda
- /react-native
- /kubuntu
- /arch-linux
- /ubuntu
- /revery
- /spring
- /manjaro
- /django
- /diversity
- /lua
- /nodejs
- /slackware
- /julia
- /c
- /markdown