Code Explainers

Code explainers tagged #csv-parsing

java 
@Configuration
@EnableBatchProcessing
public class CustomerImportJobConfig {
 

How a chunk-based CSV import job works in Spring

batch-processing etl csv-parsing
Intermediate 9 steps
rust 
use chrono::NaiveDate;
use serde::{Deserialize, Deserializer};
 
#[derive(Debug, Deserialize)]

Custom date parsing with serde in Rust

serde deserialization csv-parsing
Intermediate 7 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
ruby 
require "csv"
 
class Api::V1::ProductImportsController < Api::V1::BaseController
  MAX_ROWS = 10_000

Bulk CSV imports with upsert_all in Rails

bulk-insert csv-parsing upsert
Intermediate 8 steps
go 
package inventory
 
import (
	"encoding/csv"

Parsing CSV into typed structs in Go

csv-parsing error-wrapping type-conversion
Intermediate 8 steps
php 
public function importCustomers(UploadedFile $file): array
{
    $errors = [];
    $imported = 0;

Validating a CSV import in Laravel

csv-parsing validation error-accumulation
Intermediate 8 steps
java 
public List<Employee> parseEmployees(Path csvPath) throws IOException {
    List<Employee> employees = new ArrayList<>();
 
    try (BufferedReader reader = Files.newBufferedReader(csvPath, StandardCharsets.UTF_8)) {

Parsing a CSV into typed objects in Java

csv-parsing file-io try-with-resources
Intermediate 7 steps
python 
import csv
from collections import defaultdict
from dataclasses import dataclass, field
from decimal import Decimal, InvalidOperation

Aggregating CSV sales by category in Python

dataclasses csv-parsing defaultdict
Intermediate 8 steps
ruby 
require "csv"
 
class SalesReport
  def initialize(path)

Aggregating CSV sales data in Ruby

data-aggregation memoization group_by
Intermediate 6 steps
javascript 
import Papa from 'papaparse';
 
const MAX_SIZE = 5 * 1024 * 1024;
 

Validating and parsing CSV uploads in the browser

promises csv-parsing validation
Intermediate 8 steps