[LeetCode] 8. String to Integer (atoi) (Kotlin)

https://leetcode.com/problems/string-to-integer-atoi/

String to Integer (atoi) - LeetCode

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class Solution {
    fun myAtoi(s: String): Int {
        var answer = ""

        var isFirstLeading = true
        var signNumber = 0
        for (i: Int in s.indices) {
            val ch = s[i]

            if (isFirstLeading && ch == ' ') {
                continue
            } else {
                isFirstLeading = false
            }

            if (signNumber == 0) {
                if (ch == '-') {
                    signNumber = -1
                    continue
                } else if (ch == '+') {
                    signNumber = 1
                    continue
                } else {
                    signNumber = 1
                }
            }

            if (ch.isDigit()) {
                answer += ch
            } else if (signNumber != 0) {
                break
            }
        }

        return if (answer.isEmpty()) {
            0
        } else {
            if (answer.toBigInteger() > Int.MAX_VALUE.toBigInteger()) {
                if (signNumber == -1) Int.MIN_VALUE
                else Int.MAX_VALUE
            } else {
                answer.toInt() * signNumber
            }
        }
    }
}

https://github.com/960813/leetcode-problems/commit/5a49d454673a93ec3786ddaf625bcd342f90003e

[8] Kotlin · 960813/leetcode-problems@5a49d45

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