Problems › TypeScript › text
Cut a description to length
A listing card has room for a fixed number of characters, and a description cut mid-word looks broken.
- Text already within the limit is returned untouched.
- Otherwise take the first `limit` characters and append three dots.
- If that slice would land mid-word, fall back to the last space inside it — but a slice that already ends on a word boundary keeps its last word.
- With no space to fall back to, cut hard at the limit and still append the dots.
- A limit of zero or less gives an empty string.
truncateWords(text: string, limit: int) → string
Where you start
function truncateWords(text: string, limit: number): string {
}Worked examples
| Call | Result |
|---|---|
truncateWords("The quick brown fox", 10) | "The quick..." |
truncateWords("Supercalifragilistic", 5) | "Super..." |
truncateWords("Short", 10) | "Short" |
truncateWords("a b c d e f", 5) | "a b c..." |
Hint
Look at the character sitting at `limit`: if it is a space, the slice is already clean and needs no trimming back.
Reference solution in TypeScript
function truncateWords(text: string, limit: number): string {
if (limit <= 0) return '';
if (text.length <= limit) return text;
let cut = text.slice(0, limit);
if (text[limit] !== ' ') {
const sp = cut.lastIndexOf(' ');
if (sp > 0) cut = cut.slice(0, sp);
}
return cut.replace(/\s+$/, '') + '...';
}