edition

Author: AndyGauge

src/concurrency.md

@@ -7,22 +7,26 @@
 | [Pass data between two threads][ex-crossbeam-spsc] | [![crossbeam-badge]][crossbeam] | [![cat-concurrency-badge]][cat-concurrency] |
 | [Maintain global mutable state][ex-global-mut-state] | [![lazy_static-badge]][lazy_static] | [![cat-rust-patterns-badge]][cat-rust-patterns] |
 | [Calculate SHA1 sum of *.iso files concurrently][ex-threadpool-walk]  | [![threadpool-badge]][threadpool] [![walkdir-badge]][walkdir] [![num_cpus-badge]][num_cpus] [![ring-badge]][ring] | [![cat-concurrency-badge]][cat-concurrency][![cat-filesystem-badge]][cat-filesystem] |
+| [Draw fractal dispatching work to a thread pool][ex-threadpool-fractal] | [![threadpool-badge]][threadpool] [![num-badge]][num] [![num_cpus-badge]][num_cpus] [![image-badge]][image] | [![cat-concurrency-badge]][cat-concurrency][![cat-science-badge]][cat-science][![cat-rendering-badge]][cat-rendering] |
 | [Mutate the elements of an array in parallel][ex-rayon-iter-mut] | [![rayon-badge]][rayon] | [![cat-concurrency-badge]][cat-concurrency] |
 | [Test in parallel if any or all elements of a collection match a given predicate][ex-rayon-any-all] | [![rayon-badge]][rayon] | [![cat-concurrency-badge]][cat-concurrency] |
 | [Search items using given predicate in parallel][ex-rayon-parallel-search] | [![rayon-badge]][rayon] | [![cat-concurrency-badge]][cat-concurrency] |
 | [Sort a vector in parallel][ex-rayon-parallel-sort] | [![rayon-badge]][rayon] [![rand-badge]][rand] | [![cat-concurrency-badge]][cat-concurrency] |
 | [Map-reduce in parallel][ex-rayon-map-reduce] | [![rayon-badge]][rayon] | [![cat-concurrency-badge]][cat-concurrency] |
+| [Generate jpg thumbnails in parallel][ex-rayon-thumbnails] | [![rayon-badge]][rayon] [![glob-badge]][glob] [![image-badge]][image] | [![cat-concurrency-badge]][cat-concurrency][![cat-filesystem-badge]][cat-filesystem] |
 
 
 [ex-crossbeam-spawn]: concurrency/threads.html#spawn-a-short-lived-thread
 [ex-crossbeam-pipeline]: concurrency/threads.html#create-a-parallel-pipeline
 [ex-crossbeam-spsc]: concurrency/threads.html#pass-data-between-two-threads
 [ex-global-mut-state]: concurrency/threads.html#maintain-global-mutable-state
 [ex-threadpool-walk]: concurrency/threads.html#calculate-sha256-sum-of-iso-files-concurrently
+[ex-threadpool-fractal]: concurrency/threads.html#draw-fractal-dispatching-work-to-a-thread-pool
 [ex-rayon-iter-mut]: concurrency/parallel.html#mutate-the-elements-of-an-array-in-parallel
 [ex-rayon-any-all]: concurrency/parallel.html#test-in-parallel-if-any-or-all-elements-of-a-collection-match-a-given-predicate
 [ex-rayon-parallel-search]: concurrency/parallel.html#search-items-using-given-predicate-in-parallel
 [ex-rayon-parallel-sort]: concurrency/parallel.html#sort-a-vector-in-parallel
 [ex-rayon-map-reduce]: concurrency/parallel.html#map-reduce-in-parallel
+[ex-rayon-thumbnails]: concurrency/parallel.html#generate-jpg-thumbnails-in-parallel
 
 {{#include links.md}}

src/database/sqlite/initialization.md

@@ -7,8 +7,7 @@ Use the `rusqlite` crate to open SQLite databases. See
 
 [`Connection::open`] will create the database if it doesn't already exist.
 
-```rust,edition2024,no_run
-extern crate rusqlite;
+```rust,edition2021,no_run
 use rusqlite::{Connection, Result};
 
 fn main() -> Result<()> {

src/database/sqlite/insert_select.md

@@ -5,8 +5,7 @@
 [`Connection::open`] will open the database `cats` created in the earlier recipe.
 This recipe inserts data into `cat_colors` and `cats` tables using the [`execute`] method of `Connection`. First, the data is inserted into the `cat_colors` table. After a record for a color is inserted, [`last_insert_rowid`] method of `Connection` is used to get `id` of the last color inserted. This `id` is used while inserting data into the `cats` table. Then, the select query is prepared using the [`prepare`] method which gives a [`statement`] struct. Then, query is executed using [`query_map`] method of [`statement`].
 
-```rust,edition2024,no_run
-extern crate rusqlite;
+```rust,edition2021,no_run
 use rusqlite::{params, Connection, Result};
 use std::collections::HashMap;
 

src/database/sqlite/transactions.md

@@ -12,8 +12,7 @@ a unique constraint on the color name. When an attempt to insert
 a duplicate color is made, the transaction rolls back.
 
 
-```rust,edition2024,no_run
-extern crate rusqlite;
+```rust,edition2021,no_run
 use rusqlite::{Connection, Result};
 
 fn main() -> Result<()> {

src/file/read/read_lines.md

@@ -1,5 +1,5 @@
-```rust,edition2018
-extern crate tempfile;
+```rust,edition2021
+
 use std::fs::File;
 use std::io::{self, BufRead, BufReader, Write};
 use tempfile::NamedTempFile;

src/hardware/processor/cpu-count.md

@@ -4,8 +4,7 @@
 
 Shows the number of logical CPU cores in current machine using [`num_cpus::get`].
 
-```rust,edition2018
-extern crate num_cpus;
+```rust,edition2021
 fn main() {
     println!("Number of logical cores is {}", num_cpus::get());
 }

src/web/clients/api/paginated.md

@@ -5,7 +5,7 @@
 Wraps a paginated web API in a convenient Rust iterator. The iterator lazily
 fetches the next page of results from the remote server as it arrives at the end of each page.
 
-```rust,edition2024,no_run
+```rust,edition2021,no_run
 // cargo-deps: reqwest="0.11", serde="1"
 mod paginated {
   use reqwest::Result;

src/web/mime/request.md

@@ -11,11 +11,7 @@ The [`mime`] crate also defines some commonly used MIME types.
 
 Note that the [`reqwest::header`] module is exported from the [`http`] crate.
 
-```rust,edition2018,no_run
-extern crate mime;
-extern crate reqwest;
-extern crate anyhow;
-extern crate tokio;
+```rust,edition2021,no_run
 use anyhow::Result;
 use mime::Mime;
 use std::str::FromStr;

src/web/scraping/unique.md

@@ -10,7 +10,7 @@ MediaWiki link syntax is described [here][MediaWiki link syntax].  The calling
 function will retain the whole document, and links will be returned as slice
 references to the original document.
 
-```rust,edition2024,no_run
+```rust,edition2021,no_run
 // cargo-deps: tokio="1", reqwest="0.11", regex="1", anyhow="1"
 mod wiki {
   use regex::Regex;

src/web/url/base.md

@@ -7,9 +7,7 @@ files or query strings.  Each of those items are stripped out of the given
 URL.  [`PathSegmentsMut::clear`] removes paths and [`Url::set_query`] removes
 query string.
 
-```rust,edition2018
-extern crate url;
-extern crate anyhow;
+```rust,edition2021
 use anyhow::{Result, anyhow};
 use url::Url;