Q8 String to Integer (atoi) | python & JavaScript

class Solution:
    def myAtoi(self, s: str) -> int:
  
        i =0
        res = 0
        neg = 1     
        
        MAX_INT = 2 ** 31 -1
        MIN_INT = -2 ** 31 
        
        #Whitespace
        while i < len(s) and s[i] == ' ':
            i += 1
            
        #+/- symbol
        if i < len(s) and s[i] == '-':
            i += 1
            neg = -1
        elif i < len(s) and s[i] == '+':
            i += 1
            
        # check numbers MIN_MAX and outbound
        check = set('0123456789')
        while i < len(s) and s[i] in check:
            if res > MAX_INT / 10 or (res == int(MAX_INT / 10) and int(s[i]) > 7):
                return MAX_INT if neg == 1 else MIN_INT
            res = res * 10 + int(s[i])
            i += 1
            
        return res * neg

************* 2nd python ******************

class Solution:
    def myAtoi(self, s: str) -> int:

        i = 0
        MAX = 2 ** 31 -1
        MIN = -2 ** 31
        sign = 1 #initially set to pos 1
        res = 0

        while i < len(s) and s[i] == " ":
            i += 1
        
        if i < len(s) and s[i] == "-":
            sign = -1
            i += 1
        elif i < len(s) and s[i] == "+":
            i += 1
        check = set('0123456789')
        while i < len(s) and s[i] >= '0' and s[i] <= '9':
            if res > MAX / 10 or (res == int(MAX / 10) and int(s[i]) > MAX % 10):
                return MAX if sign == 1 else MIN
            res = (res * 10) + int(s[i])
            i += 1
        return res * sign


------------------JavaScript-------------------

/**
 * @param {string} s
 * @return {number}
 */
var myAtoi = function(s) {
    let i = 0;
    const MAX = 2**31 - 1
    const MIN = Math.pow(-2, 31)
    var sign = 1
    var res = 0

    while( i < s.length && s[i] == ' '){
        i += 1;
    }
    if (i < s.length && s[i] == '-'){
        sign = -1
        i += 1
    }
    else if(i < s.length && s[i] == '+'){
        i += 1
    }

    while(i < s.length && s[i] >= '0' && s[i] <= '9'){
        if(res > Math.trunc(MAX / 10) || (res == Math.trunc(MAX / 10) && parseInt(s[i]) > 7)){
            return sign == 1 ? MAX : MIN
        }
        res = (res * 10) + parseInt(s[i]);
        i += 1
    }
    return res * sign
};