/**

• @param {number[]} digits
• @return {number[]} */ var plusOne = function (digits) { let length = digits.length let tag = 0 while (length) { if (length === digits.length) { if (digits[length - 1] + 1 + tag >= 10) { digits[length - 1] = 0 tag = 1 } else { digits[length - 1] = digits[length - 1] + 1 tag = 0 break } } else { if (digits[length - 1] + tag >= 10) { digits[length - 1] = 0 tag = 1 } else { digits[length - 1] = digits[length - 1] + 1 tag = 0 break } } length-- } if (tag === 1) { digits.unshift(1) } return digits };