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feat(ui): add pluralize utility function

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Handles irregular plurals, measurement units that stay singular,
and standard English pluralization rules.
This commit is contained in:
Jason Fraley 2026-07-28 14:02:41 -04:00
parent 159755af8d
commit 5982abfb05
1 changed files with 22 additions and 0 deletions
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22
src/lib/utils.ts
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@ -4,3 +4,25 @@ import { twMerge } from "tailwind-merge"
export function cn(...inputs: ClassValue[]) {
return twMerge(clsx(inputs))
}
const IRREGULAR: Record<string, string> = {
person: "people",
child: "children",
man: "men",
woman: "women",
};
const NO_PLURAL = new Set([
"kg", "g", "mg", "mcg", "l", "ml", "cl", "dl",
"m", "cm", "mm", "km", "tick", "hertz", "hz",
]);
export function pluralize(amount: number, unit: string): string {
if (amount === 1) return unit;
const lower = unit.toLowerCase();
if (NO_PLURAL.has(lower) || unit.endsWith("s")) return unit;
if (IRREGULAR[lower]) return IRREGULAR[lower];
if (/[^aeiou]y$/i.test(unit)) return unit.slice(0, -1) + "ies";
if (/[sxz]$/i.test(unit) || /(sh|ch)$/i.test(unit)) return unit + "es";
return unit + "s";
}