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[Codewars] 4 kyu - Sum Strings as Numbers

題意

大數相加。

程式

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function sumStrings(a,b) { 
  if ( b.length > a.length ){
    var temp = a ;
    a = b ;
    b = temp ;
  }
  while ( b.length < a.length ){
    b = '0' + b ;
  }
  a = a.split('').reverse().join('');
  b = b.split('').reverse().join('');
  var c = '' , i = 0 ;
  var carry = 0 ;
  for ( var i = 0 ; i < a.length ; i ++ ) {
    var result = parseInt(a[i]) + parseInt(b[i]) + carry ;
    carry = 0 ;
    if ( result >= 10 ){
      result -= 10 ;
      carry ++ ;
    }
    c = c + result;
  }
  if ( carry !== 0 ){
    c = c + '1' ;
  }
  while ( c[c.length-1] === '0' ){
    c = c.slice(0,c.length-1) ;
  }
  c = c.split('').reverse().join('') ;
  return c ;
}