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