46 lines
1.2 KiB
TypeScript
46 lines
1.2 KiB
TypeScript
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/**
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* Convert decimal number to fraction
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*
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* @example
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* ```js
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* dec2Frac(1.25) // Outputs: "1 1/4"
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* ```
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*
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* @param {number} num Number to convert
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* @return {string} Fraction with remainder
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*/
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export function dec2Frac(num: number) {
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const gcd = (a: number, b: number): number => {
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if (b < 0.0000001) return a;
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return gcd(b, ~~(a % b));
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};
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const len = num.toString().length - 2;
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let denominator = Math.pow(10, len);
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let numerator = num * denominator;
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const divisor = gcd(numerator, denominator);
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numerator = ~~(numerator / divisor);
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denominator = ~~(denominator / divisor)
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const remainder = ~~(numerator / denominator);
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numerator -= remainder * denominator;
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return `${remainder ? remainder + ' ' : ''}${~~(numerator)}/${~~(denominator)}`;
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}
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/**
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* Convert fraction to decimal number
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*
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* @example
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* ```js
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* fracToDec('1 1/4') // Outputs: 1.25
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* ```
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*
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* @param {string} frac Fraction to convert
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* @return {number} Faction as a decimal
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*/
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export function fracToDec(frac: string) {
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let split = frac.split(' ');
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const whole = split.length == 2 ? Number(split[0]) : 0;
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split = (<string>split.pop()).split('/');
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return whole + (Number(split[0]) / Number(split[1]));
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}
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