Tomek Świstak

@swistak.codes

66 Followers 250 Following

🦫 swistak.codes author (Polish) 🤓 JavaScript Developer (10+ years in IT) ☁️ Software Architect 🎸 Writing mostly IT related stuff (English and Polish) 🎯 Also: games, music, movies etc ➡️ More: https://linktr.ee/swistak.codes

blablabla zagraj w naszą grę, linkedin

Można teraz bezpiecznie wyłączyć komputer.

// ❌ ŹLE
const isEqual1 = 0.1 + 0.2 === 0.3;
console.log(isEqual1); // false

// ✅ DOBRZE
const isEqual2 = Math.abs(0.1 + 0.2 - 0.3) < Number.EPSILON;
console.log(isEqual2); // true

// ❌ ŹLE
const users = [
{ id: '1-1-1', name: 'Jan' },
{ id: '4-1-2', name: 'Anna' },
{ id: '1-5-1', name: 'Paweł' }
];
const anna = users.find(x => x.id === '4-1-2');

// ✅ DOBRZE
const users = {
'1-1-1': { id: '1-1-1', name: 'Jan' },
'4-1-2': { id: '4-1-2', name: 'Anna' },
'1-5-1': { id: '1-5-1', name: 'Paweł' }
};
const anna = users['4-1-2'];