Code Explainers
Code explainers tagged #file-io
java
public final class ChunkSorter { private static final int MAX_LINES_PER_CHUNK = 100_000;
External merge sort in Java
external-sort
merge-sort
priority-queue
Advanced
10 steps
php
<?php function streamFileWithRanges(string $path, ?string $rangeHeader): void {
How HTTP range requests stream files in PHP
http-range-requests
streaming
partial-content
Intermediate
10 steps
java
public final class IniParser { private static final Pattern SECTION = Pattern.compile("\\[(.+?)\\]");
Parsing INI files in Java
parsing
regex
state-machine
Intermediate
10 steps
ruby
module Dotenv LINE = /\A\s*(?:export\s+)?([A-Za-z_][A-Za-z0-9_]*)\s*=\s*(.*?)\s*\z/ module_function
Parsing a .env file in Ruby
parsing
regular-expressions
environment-variables
Intermediate
8 steps
python
import hashlib from collections import defaultdict from pathlib import Path
Finding duplicate files by size then hash
hashing
file-io
deduplication
Intermediate
7 steps
rust
use std::fs::File; use std::io::{Read, Seek, SeekFrom}; #[derive(Debug)]
Parsing an HTTP Range header in Rust
http-range
parsing
file-io
Intermediate
10 steps
ruby
require "charlock_holmes" class TextFileNormalizer DEFAULT_CONFIDENCE = 60
Normalizing text files to clean UTF-8 in Ruby
encoding
text-processing
file-io
Intermediate
8 steps
java
@GetMapping("/files/{id}") public ResponseEntity<StreamingResponseBody> download( @PathVariable String id, @RequestHeader(value = HttpHeaders.RANGE, required = false) String rangeHeader) throws IOException {
HTTP range requests in Spring
http-range
streaming
file-io
Advanced
10 steps
rust
use std::collections::BTreeSet; use std::fs::File; use std::io::{self, BufRead, BufReader, BufWriter, Write}; use std::path::Path;
Deduplicating and sorting words in Rust
file-io
btreeset
string-processing
Intermediate
6 steps
java
public final class BomAwareReader { private static final char UTF8_BOM = '\uFEFF';
Skipping the UTF-8 byte-order mark in Java
file-io
encoding
byte-order-mark
Intermediate
6 steps
python
import wave import os from dataclasses import dataclass
Reading WAV metadata into a dataclass
dataclass
audio
file-io
Beginner
5 steps
java
public class DuplicateFinder { public Map<String, List<Path>> findDuplicates(Path root) throws IOException { Map<String, List<Path>> byHash = new HashMap<>();
Finding duplicate files by content hash
hashing
file-io
streams
Intermediate
8 steps
rust
use std::collections::HashMap; use std::fs::File; use std::io::{self, BufRead, BufReader}; use std::path::Path;
Parsing INI files in Rust
parsing
file-io
hashmap
Intermediate
9 steps
python
from pathlib import Path from PIL import Image, ImageOps
Batch image resizing with Pillow
image-processing
batch-jobs
error-handling
Intermediate
8 steps
python
from pathlib import Path import chardet
Reading text files of unknown encoding in Python
encoding
byte-order-mark
fallback
Intermediate
8 steps
java
package com.example.inventory; import org.apache.commons.csv.CSVFormat; import org.apache.commons.csv.CSVParser;
Reading and writing CSV with Commons CSV
csv-parsing
file-io
try-with-resources
Intermediate
7 steps
python
import os import tarfile from pathlib import Path
Safely compressing and extracting tar.gz archives
file-io
compression
path-traversal
Intermediate
6 steps
java
public final class ZipExtractor { private final Path targetDir;
Extracting a zip safely in Java
path-traversal
streams
file-io
Intermediate
8 steps