biggest/src/subtract.ts at main · hmmhmmhm/biggest

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import {

addAbsolute,

compareAbsolute,

parseNumber,

subtractAbsolute,

} from "./utils";

export function subtract(left: string, right: string): string {

const num1 = parseNumber(left);

const num2 = parseNumber(right);

let resultSign = 1;

let result = "";

// If the signs are different, add them

if (num1.sign !== num2.sign) {

num2.sign = num1.sign;

result = addAbsolute(num1, num2);

resultSign = num1.sign;

} else {

// If the signs are the same, subtract them

let cmp = compareAbsolute(num1, num2);

if (cmp === 0) {

return "0";

} else if (cmp > 0) {

result = subtractAbsolute(num1, num2);

resultSign = num1.sign;

} else {

result = subtractAbsolute(num2, num1);

resultSign = -num1.sign;

}

if (result === "0") {

return "0";

} else {

return (resultSign === -1 ? "-" : "") + result;

}

export default subtract;