supertips.js

/*
@source: https://javascript.plainenglish.io/50-javascript-shortcuts-that-will-make-you-a-code-wizard-in-2025-14dd7aee319c
*/

// 1. Ternary Operator
const status = loggedIn ? "Welcome!" : "Please login.";
// 2. Default Parameters
function greet(name = "Stranger") {
  return `Hello, ${name}`;
}
// 3. Arrow Functions
const multiply = (a, b) => a * b;
// 4. Destructuring Objects
const { title, year } = movie;
// 5. Destructuring Arrays
const [first, second] = topResults;
// 6. Template Literals
const greeting = `Hey, ${user.name}!`;
// 7. Spread Operator
const newTeam = [...oldTeam, "Alice"];
// 8. Rest Parameters
function logAll(...args) {
  console.log(args);
}
// 9. Optional Chaining
const city = user?.address?.city;
// 10. Nullish Coalescing
const nickname = inputName ?? "Anonymous";
// 12. Logical OR Assignment
settings.volume ||= 50;
// 13. Logical AND Assignment
user.isAdmin &&= false;
// 14. Object Property Shorthand
const age = 24;
const person = { name, age };
// 15. Computed Property Names
const field = "score";
const stats = { [field]: 100 };
// 16. For-of Loop
for (const char of name) {
  console.log(char);
}
// 17. forEach
tags.forEach(tag => console.log(`#${tag}`));
// 18. map()
const lengths = names.map(n => n.length);
// 19. filter()
const passed = grades.filter(g => g >= 60);
// 20. reduce()
const sum = numbers.reduce((a, b) => a + b, 0);
// 21. includes()
if (items.includes("🚀")) launch();
// 22. Unique Array with Set
const unique = [...new Set(tags)];
// 23. Object.entries()
Object.entries(data).forEach(([k, v]) => console.log(k, v));
// 24. Object.values()
const values = Object.values(config);
// 25. Object.keys()
const keys = Object.keys(settings);
// 26. Array Method Chaining
data.filter(a => a.active).map(a => a.name);
// 27. Flatten Arrays
const flat = nested.flat(2);
// 28. String.trim()
const cleaned = input.trim();
// 29. padStart()
const padded = id.padStart(5, "0");
// 30. Format Numbers
const price = new Intl.NumberFormat().format(1234567);
// 31. Dynamic Import
const module = await import("./utils.js");
// 32. Promise.all()
await Promise.all([loadUser(), loadPosts()]);
// 33. Async/Await
const getData = async () => {
  const res = await fetch(url);
  return await res.json();
};
// 34. Optional Function Params
function log(message, level = "info") {
  console[level](message);
}
// 35. Number Conversion with +
const num = +"42";
// 36. Boolean Conversion with !!
const isValid = !!userInput;
// 37. Swap Values
[a, b] = [b, a];
// 38. String to Array
const chars = [..."dev"];
// 39. Clone Object
const copy = { ...original };
// 40. Debounce
const debounce = (fn, delay) => {
  let timeout;
  return (...args) => {
    clearTimeout(timeout);
    timeout = setTimeout(() => fn(...args), delay);
  };
};
// 41. Named Capture Groups in Regex
const url = "https://dev.to";
const match = url.match(/(?<protocol>https?):\/\/(?<host>.+)/);
console.log(match.groups);
// 42. ??= Operator
data.username ??= "guest";
// 43. Numeric Separators
const big = 1_000_000_000;
// 44. Top-Level await (in modules)
const user = await fetchUser();
// 45. Array.from with Map
const numbers = Array.from(new Set([1, 2, 2, 3]));
// 46. Group Array by Property
const grouped = data.reduce((acc, obj) => {
  acc[obj.type] = acc[obj.type] || [];
  acc[obj.type].push(obj);
  return acc;
}, {});
// 47. isFinite()
if (isFinite(num)) { /* safe to use */ }
// 48. Abort Fetch Request
const controller = new AbortController();
fetch(url, { signal: controller.signal });
controller.abort();
// 49. toLocaleString()
(1234567.89).toLocaleString("en-US", {
  style: "currency",
  currency: "USD"
});
// 50. StructuredClone
const clone = structuredClone(myObj);