implement BigInt subtraction

2022年5月1日

小于 1 分钟

Question

Luckily we already have built-in support of BigIntopen in new window in JavaScript, at least in some browsers.

1000000000000000000000n - 999999999999999999999n
// 1n

Suppose BigInt cannot be used, can you implement a string subtraction function by yourself?

subtract('1000000000000000000000', '999999999999999999999')
// '1'

All input are valid non-negative integer strings, and the result is guaranteed to be non-negative.

Don't use BigInt directly, it is not our goal here

/**
 * @param {string} num1
 * @param {string} num2
 * @return {string}
 */
function subtract(num1, num2) {
  // your code here
}