Code Explainers

Code explainers tagged #normalization

python 
import pandas as pd
import numpy as np
 
 

Cleaning a customer DataFrame with pandas

data-cleaning regex normalization
Intermediate 9 steps
java 
public final class EmailNormalizer {
 
    private static final Pattern EMAIL_PATTERN = Pattern.compile(
        "^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}$"

Normalizing email addresses in Java

validation regex normalization
Intermediate 8 steps
python 
from collections.abc import MutableMapping
 
 
class CaseInsensitiveDict(MutableMapping):

Building a case-insensitive dict in Python

data structures abstract base classes dunder methods
Intermediate 8 steps
typescript 
interface ParsedName {
  first: string;
  middle: string;
  last: string;

Parsing human names into structured parts

parsing string-manipulation normalization
Intermediate 9 steps
typescript 
import { parsePhoneNumberFromString, CountryCode } from 'libphonenumber-js';
 
export interface NormalizedPhone {
  e164: string;

Normalizing phone numbers to E.164 in TypeScript

validation normalization error-handling
Intermediate 7 steps
typescript 
import slugify from "slugify";
 
interface SlugRepository {
  exists(slug: string): Promise<boolean>;

Generating unique URL slugs from titles

slugs normalization uniqueness
Intermediate 6 steps
rust 
pub fn collapse_whitespace(input: &str) -> String {
    let mut result = String::with_capacity(input.len());
    let mut in_whitespace = false;
 

Collapsing runs of whitespace in Rust

string-processing state-machine iteration
Beginner 5 steps
typescript 
type Handler = (event: KeyboardEvent) => void;
 
interface Binding {
  combo: string;

Building a keyboard shortcut manager in TypeScript

event-handling normalization closures
Intermediate 7 steps
go 
package email
 
import (
	"errors"

Normalizing and deduping email addresses in Go

validation normalization deduplication
Intermediate 8 steps
php 
<?php
 
namespace App\Support;
 

Normalizing phone numbers to E.164 in PHP

input-validation normalization regular-expressions
Intermediate 8 steps
javascript 
function splitFullName(fullName) {
  const cleaned = (fullName || '').trim().replace(/\s+/g, ' ');
 
  if (!cleaned) {

Parsing full names into first and last

string-parsing regex edge-cases
Intermediate 8 steps
ruby 
class User < ApplicationRecord
  has_secure_password
 
  normalizes :email, with: ->(email) { email.strip.downcase }

Normalizing user input in Rails models

normalization validation data integrity
Intermediate 6 steps
ruby 
class ContactImporter
  def initialize(rows)
    @rows = rows
  end

Deduplicating contacts with Enumerable#uniq

deduplication normalization enumerable
Intermediate 4 steps
javascript 
import { parsePhoneNumberFromString } from 'libphonenumber-js';
 
export class PhoneValidationError extends Error {
  constructor(message, code) {

Normalizing phone numbers with typed errors

validation error-handling custom-errors
Intermediate 6 steps
python 
import re
from email_validator import validate_email, EmailNotValidError
 
_DISPOSABLE_DOMAINS = {

Normalizing signup emails in Python

validation normalization data-cleaning
Intermediate 8 steps
python 
from datetime import datetime
from zoneinfo import ZoneInfo
 
 

Timezone-safe datetime handling in Python

timezones datetime normalization
Intermediate 4 steps