---
# System prepended metadata

title: Rohit Kumar

---

Qn 1
    sum of digits until single digit
    https://leetcode.com/problems/add-digits/

* worked for all cases.. completed within 10 mins

```
/**
 * @param {number} num
 * @return {number}
 */
var addDigits = function(num) {
    while(num >= 10){
    num = num.toString().split('').reduce((sum, digit) => sum + parseInt(digit, 10), 0)
    }
    return num
};
```

Qn 2
pattern string matching https://leetcode.com/problems/word-pattern/

* code is fine, but not able to debug why its not working for simple cases
* took more than 15 mins

```
/**
 * @param {string} pattern
 * @param {string} s
 * @return {boolean}
 */
var wordPattern = function(pattern, s) {
    const words = s.split(' ')
    if(pattern.length !== words.length){
        return false
    }

    let patternObj = {}
    console.log('lenght', pattern.length)

    for(let i =0; i < pattern.length; i++){
        console.log('char', pattern[i])
        if(!patternObj[pattern[i]]){
            console.log(patternObj[pattern[i]], patternObj)
            patternObj[pattern[i]]= words[i]
        } else {
            console.log('words', words[i], pattern[i])
            if(patternObj[words[i]] !== pattern[i]){
                return false
            }
        }

    }
    console.log('finish')
    return true
    console.log(patternObj)
    // const patternMap = new Map()
    // const wordMap = new Map()
    // for(let i = 0; i < pattern.length; i++){
    //     const char = pattern[i]
    //     const word = words[i]
        
    //     if(!patternMap.has(char)){
    //         patternMap.set(char, word)
    //     } 
    //        else if(patterMap.get(char) !== wsord){
    //             return false;
    //         }
        

    //     if(!wordMap.has(word)){
    //         wordMap.set(word, char)
    //     } else {
    //         if(wordMap.get(word) !== char){
    //             return false;
    //         }
    //     }
    // }
    // return true


};
```

Qn 3

database design for restaurant table reservation system
* direction is correct
* have some experience
* ok ok with this

```
/**
table reservation system
ram resto
1
10

mohan
1
rams


restorant : {
    id:
    name: 
    address;
    o
}

seats
    booked: true;
    restorantId: 1
    noOfeats: 10
    serialNo.


users: {
    userName:
    
}

orders :{
    id: 
    user: 12,
    restroantId: 
    tableNo.
    status
}

{
    userId: 'mohane',
    restId: 1,
    tableNo.: 1,
    status: checked
}
 */
 ```

