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34 changes: 34 additions & 0 deletions src/utils/clampNumber.test.ts
Original file line number Diff line number Diff line change
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import { describe, it, expect } from 'vitest';
import { clampNumber } from './clampNumber';

describe('clampNumber', () => {
it('returns value if within min and max', () => {
expect(clampNumber(5, 1, 10)).toBe(5);
});

it('returns min if value is less than min', () => {
expect(clampNumber(-5, 0, 10)).toBe(0);
});

it('returns max if value is greater than max', () => {
expect(clampNumber(20, 0, 10)).toBe(10);
});

it('returns min when value equals min', () => {
expect(clampNumber(3, 3, 8)).toBe(3);
});

it('returns max when value equals max', () => {
expect(clampNumber(8, 3, 8)).toBe(8);
});

it('handles zero boundaries correctly', () => {
expect(clampNumber(0, 0, 0)).toBe(0);
expect(clampNumber(1, 0, 0)).toBe(0);
expect(clampNumber(-1, 0, 0)).toBe(0);
});

it('throws if min > max', () => {
expect(() => clampNumber(5, 10, 1)).toThrow('min must be less than or equal to max');
});
});
15 changes: 15 additions & 0 deletions src/utils/clampNumber.ts
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/**
* Clamps a number between min and max (inclusive).
* @param value - The input number to clamp.
* @param min - The minimum allowable value.
* @param max - The maximum allowable value.
* @returns The clamped number.
*/
export function clampNumber(value: number, min: number, max: number): number {
if (min > max) {
throw new Error('min must be less than or equal to max');
}
if (value < min) return min;
if (value > max) return max;
return value;
}