Calculator with Negative and Fractions

// JavaScript calculation logic function calculate(a, b, operation) { // Convert fractions to decimals if needed a = convertFractionToDecimal(a); b = convertFractionToDecimal(b); let result; switch(operation) { case 'add': result = a + b; break; case 'subtract': result = a - b; break; case 'multiply': result = a * b; break; case 'divide': result = a / b; break; default: result = NaN; } // Convert back to fraction if possible return convertDecimalToFraction(result); } function convertFractionToDecimal(input) { if (typeof input === 'string' && input.includes('/')) { const parts = input.split('/'); return parseFloat(parts[0]) / parseFloat(parts[1]); } return parseFloat(input); } function convertDecimalToFraction(decimal) { if (decimal % 1 === 0) return decimal.toString(); const tolerance = 1.0E-6; let h1 = 1, h2 = 0; let k1 = 0, k2 = 1; let b = decimal; do { const a = Math.floor(b); let aux = h1; h1 = a * h1 + h2; h2 = aux; aux = k1; k1 = a * k1 + k2; k2 = aux; b = 1 / (b - a); } while (Math.abs(decimal - h1 / k1) > decimal * tolerance); return `${h1}/${k1}`; }