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July 14, 2021 17:29
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Number.toFixed but without rounding the numbers
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describe('toFixedWithoutRounding()', () => { | |
it('should return a string', () => { | |
const result = toFixedWithoutRounding(3271.24); | |
expect(typeof result).toBe('string'); | |
}); | |
it('should return expected numbers', () => { | |
expect(toFixedWithoutRounding(7933.2982426892, 1)).toBe('7933.2'); | |
expect(toFixedWithoutRounding(7933.2982426892, 2)).toBe('7933.29'); | |
expect(toFixedWithoutRounding(7933.2982426892, 3)).toBe('7933.298'); | |
expect(toFixedWithoutRounding(103415.324)).toBe('103415.32'); | |
expect(toFixedWithoutRounding(103415.324, 3)).toBe('103415.324'); | |
expect(toFixedWithoutRounding(103415.324, 4)).toBe('103415.3240'); | |
expect(toFixedWithoutRounding(0.893, 3)).toBe('0.893'); | |
expect(toFixedWithoutRounding(0.893, 4)).toBe('0.8930'); | |
expect(toFixedWithoutRounding(0.893, 5)).toBe('0.89300'); | |
}); | |
}); |
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export function toFixedWithoutRounding(value: number, decimals = 2): string { | |
const [number, numberDecimals = ''] = (value ?? 0).toString().split('.'); | |
const truncatedDecimals = numberDecimals.slice(0, decimals); | |
const formattedDecimals = truncatedDecimals.padEnd(decimals, '0'); | |
const fixedNumber = [number, formattedDecimals].join('.'); | |
return fixedNumber; | |
} |
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