Biblioteca de fragmentos

Fragmentos probados y listos para copiar en Python, Flask, JavaScript, SQL, HTML, CSS y Bash. Abre cualquiera en el playground.

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4 fragmentos

javascript

Deep clone an object

structuredClone copies nested objects, Dates, Maps and Sets correctly.

const original = { user: { name: "Ada" }, created: new Date(), tags: new Set(["js"]) };
const copy = structuredClone(original);

copy.user.name = "Grace";
console.log(original.user.name);          // Ada (unchanged)

beginner #objects#data

javascript

Group an array by a key

Build an object of arrays with reduce (works everywhere, unlike Object.groupBy).

const orders = [
  { customer: "ada", total: 30 },
  { customer: "linus", total: 12 },
  { customer: "ada", total: 8 },
];

beginner #arrays#data#objects

python

Group items by a key

Turn a flat list into a dict of lists with collections.defaultdict.

from collections import defaultdict

orders = [
    {"customer": "ada", "total": 30},
    {"customer": "linus", "total": 12},

beginner #collections#dict#data

python

Read and write CSV files

Read rows as dicts and write a filtered copy with csv.DictWriter.

import csv
import io

source = io.StringIO("name,score\nada,91\nlinus,78\ngrace,88\n")   # use open("in.csv") for a file
rows = [row for row in csv.DictReader(source) if int(row["score"]) >= 80]

beginner #csv#files#data

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