title: Find Position Given Number Among Numbers Made 4 7
signature: function findPositionGivenNumberAmongNumbersMade47(n: string): number {
source_py: def find_position_given_number_among_numbers_made_4_7(n):
      i = 0
      j = len(n)
      pos = 0
      while (i < j):
          if (n[i] == '4'):
              pos = ((pos * 2) + 1)
          if (n[i] == '7'):
              pos = ((pos * 2) + 2)
          i = (i + 1)
      return pos
source_cpp: int find_position_given_number_among_numbers_made_4_7(string n) {
    int i = 0, pos = 0;
    while ( n [ i ] != '\0' ) {
      switch ( n [ i ] ) {
        case '4' : pos = pos * 2 + 1;
        break;
        case '7' : pos = pos * 2 + 2;
        break;
      }
      i ++;
    }
    return pos;
  }
question_info.test_list: [{"idx": 0, "outputs": 2, "inputs": {"n": "7"}}, {"idx": 1, "outputs": 5, "inputs": {"n": "305745689"}}, {"idx": 2, "outputs": 7, "inputs": {"n": "444"}}, {"idx": 3, "outputs": 1, "inputs": {"n": "4"}}, {"idx": 4, "outputs": 5, "inputs": {"n": "2074"}}, {"idx": 5, "outputs": 2, "inputs": {"n": "27"}}, {"idx": 6, "outputs": 8, "inputs": {"n": "447"}}, {"idx": 7, "outputs": 0, "inputs": {"n": "255"}}, {"idx": 8, "outputs": 0, "inputs": {"n": "10000111111011"}}, {"idx": 9, "outputs": 0, "inputs": {"n": "fAKcSDRTNz"}}]
question_info.entry_cls_name: Solution
question_info.test_code: 
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  function convertToString(value: any): string{
      return JSON.stringify(value, function (key, val) {
          if (val instanceof Set) {
              return Array.from(val);
          } return val;});
  }
  
  function validateSolution(actual: number, expected: number): boolean {
      return convertToString(actual) === convertToString(expected);
  }
  
  function driver(n: string, expected:number): string {
      try{
          if (validateSolution(PLACEHOLDER_FN_NAME(n),expected)){
              return "PASSED";
          }
          return "FAILED";
      } catch (error) {
        return error.name;
      }
      
  }
      
  function main(){
    let result = '';
    result = driver("7", 2);
    console.log(`TEST-0...${result}`);
  
    result = driver("305745689", 5);
    console.log(`TEST-1...${result}`);
  
    result = driver("444", 7);
    console.log(`TEST-2...${result}`);
  
    result = driver("4", 1);
    console.log(`TEST-3...${result}`);
  
    result = driver("2074", 5);
    console.log(`TEST-4...${result}`);
  
    result = driver("27", 2);
    console.log(`TEST-5...${result}`);
  
    result = driver("447", 8);
    console.log(`TEST-6...${result}`);
  
    result = driver("255", 0);
    console.log(`TEST-7...${result}`);
  
    result = driver("10000111111011", 0);
    console.log(`TEST-8...${result}`);
  
    result = driver("fAKcSDRTNz", 0);
    console.log(`TEST-9...${result}`);
  
  };
  
  main();
question_info.extension: ts
question_info.entry_fn_name: findPositionGivenNumberAmongNumbersMade47
question_info.test_case_ids: 0 1 2 3 4 5 6 7 8 9
question_info.commands: tsc --target es2020 --lib es5,dom,es2015,es2020 __FILENAME__
question_info.commands: node __FILENAME__.js