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| | | | Featured content | | Here's something most JavaScript developers don't know: | You can shorten any piece of code into a single line. | With one-liners I went from 17 imperative lines: | // ❌ 17 lines function extractRedirects(str) { let lines = str.split('\n'); let sourceDestinationList = []; for (let line of lines) { let sourceDestination = line.split(' '); let source = sourceDestination[2]; let destination = sourceDestination[3]; let redirectObj = { source: source, destination: destination, permanent: true, }; sourceDestinationList.push(redirectObj); } return sourceDestinationList; }
| To a single functional statement: | // ✅ 1 line -- formatted const extractRedirects = (str) => str .split('\n') .map((line) => line.split(' ')) .map(([, , source, destination]) => ({ source, destination, permanent: true, }));
| The second is so much cleaner and elegant -- you can clearly see how the data beautifully flows from input to output with no breaks. | Let's look at 10 unconventional JS one-liners that push you to the limits of what's possible with JavaScript. | | What do you make of this: | // ✅ Standard Fisher-Yates shuffle, functional version const shuffleArray = (arr) => [...Array(arr.length)] .map((_, i) => Math.floor(Math.random() * (i + 1))) .reduce( (shuffled, r, i) => shuffled.map((num, j) => j === i ? shuffled[r] : j === r ? shuffled[i] : num ), arr ); // [ 2, 4, 1, 3, 5 ] (varies) console.log(shuffleArray([1, 2, 3, 4, 5]));
| The most complex thing for me was figuring out the immutable no-variable version of the swap — and reduce() has a way of making your head spin. | Then there's this too: | | | This is a little-known way to console log without newline that many developers have never used. | Let's say we need to log in a loop like this: | for (let i = 1; i <= 5; i++) { // print number without newline } // Output: 1 2 3 4 5
| Unfortunately normal console log doesn't work. | So what do we do? | | What we do: is process.stdout.write: | | How is process.stdout.write different from console.log? | Well first of all, console.log is process.stdout.write! | stdout is the fundamental way every CLI program logs output to the console.
| That's what it uses at its core: | | Thanks for taking the time to read today's issue. | Don't let the bugs byte,
Tari Ibaba |
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