Numbers

Rounding, clamping, formatting, safe arithmetic. Import from @mongez/reinforcements.

Rounding with precision

round(value: number, precision?: number): number  // default 2; rounds half-up
floor(value: number, precision?: number): number  // default 0
ceil(value: number, precision?: number): number   // default 0
toFixed(value: number, precision?: number): number  // returns number, not string

round(1.235, 2);   // 1.24
round(1.5, 0);     // 2     (true rounding, not floor)
floor(1.99, 1);    // 1.9
ceil(1.01, 1);     // 1.1
toFixed(1.236, 2); // 1.24  (number, not "1.24")

Range helpers

clamp(value: number, min: number, max: number): number
inRange(value: number, min: number, max: number, options?: { inclusive?: boolean }): boolean
lerp(a: number, b: number, t: number): number

clamp normalizes swapped bounds. inRange defaults to inclusive: true.

clamp(15, 0, 10);                          // 10
clamp(-3, 0, 10);                          // 0
inRange(5, 0, 10);                         // true
inRange(10, 0, 10, { inclusive: false });  // false
lerp(0, 100, 0.25);                        // 25

Safe arithmetic

safeDivide

safeDivide<F = number>(a: number, b: number, fallback?: F): number | F

Returns fallback (default 0) when b === 0 or the result isn’t finite.

safeDivide(10, 2);          // 5
safeDivide(10, 0);          // 0
safeDivide(10, 0, null);    // null

percentage

percentage(value: number, total: number, decimals?: number): number  // default 2

percentage(25, 200);   // 12.5
percentage(7, 9, 1);   // 77.8
percentage(1, 0);      // 0   (safe on divide-by-zero)

parseNumber

parseNumber<F = number>(value: unknown, fallback?: F): number | F

Returns fallback (default 0) for null / undefined / "" / non-numeric input.

parseNumber("42");        // 42
parseNumber("abc", -1);   // -1
parseNumber(null, 0);     // 0

Formatting

formatBytes

formatBytes(bytes: number, options?: {
  decimals?: number;   // default 2
  binary?: boolean;    // default false (use 1000-based units)
}): string

formatBytes(1500);                          // "1.50 KB"
formatBytes(1024, { binary: true, decimals: 0 }); // "1 KiB"
formatBytes(-1500, { decimals: 0 });        // "-2 KB"
formatBytes(0);                             // "0 B"

formatNumber

formatNumber(value: number, options?: Intl.NumberFormatOptions & {
  locale?: string | string[];
}): string

Thin wrapper around Intl.NumberFormat.

formatNumber(1234.5);                                     // "1,234.5"
formatNumber(0.42, { style: "percent" });                 // "42%"
formatNumber(99, { style: "currency", currency: "USD" }); // "$99.00"
formatNumber(1234, { locale: "ar-EG" });                  // "١٬٢٣٤"