30-Days-Of-JavaScript/Exercise-Solutions/days/16_day_JSON.md

  # Day 16  - Json
 

## [Exercise:Solutions](#exercise-solutions)

- ### [Exercise:Level 1](#exercises-level-1)
- ### [Exercise:Level 2](#exercises-level-2)
- ### [Exercise:Level 3](#exercises-level-3) <hr>


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## Exercise Solutions

```js
const skills = ['HTML', 'CSS', 'JS', 'React','Node', 'Python']
let age = 250;
let isMarried = true
const student = {
  firstName:'Asabeneh',
  lastName:'Yetayehe',
  age:250,
  isMarried:true,
  skills:['HTML', 'CSS', 'JS', 'React','Node', 'Python', ]
}
const txt = `{
    "Alex": {
        "email": "alex@alex.com",
        "skills": [
            "HTML",
            "CSS",
            "JavaScript"
        ],
        "age": 20,
        "isLoggedIn": false,
        "points": 30
    },
    "Asab": {
        "email": "asab@asab.com",
        "skills": [
            "HTML",
            "CSS",
            "JavaScript",
            "Redux",
            "MongoDB",
            "Express",
            "React",
            "Node"
        ],
        "age": 25,
        "isLoggedIn": false,
        "points": 50
    },
    "Brook": {
        "email": "daniel@daniel.com",
        "skills": [
            "HTML",
            "CSS",
            "JavaScript",
            "React",
            "Redux"
        ],
        "age": 30,
        "isLoggedIn": true,
        "points": 50
    },
    "Daniel": {
        "email": "daniel@alex.com",
        "skills": [
            "HTML",
            "CSS",
            "JavaScript",
            "Python"
        ],
        "age": 20,
        "isLoggedIn": false,
        "points": 40
    },
    "John": {
        "email": "john@john.com",
        "skills": [
            "HTML",
            "CSS",
            "JavaScript",
            "React",
            "Redux",
            "Node.js"
        ],
        "age": 20,
        "isLoggedIn": true,
        "points": 50
    },
    "Thomas": {
        "email": "thomas@thomas.com",
        "skills": [
            "HTML",
            "CSS",
            "JavaScript",
            "React"
        ],
        "age": 20,
        "isLoggedIn": false,
        "points": 40
    },
    "Paul": {
        "email": "paul@paul.com",
        "skills": [
            "HTML",
            "CSS",
            "JavaScript",
            "MongoDB",
            "Express",
            "React",
            "Node"
        ],
        "age": 20,
        "isLoggedIn": false,
        "points": 40
    }
}
```
### Exercises Level 1

1. Change skills array to JSON using JSON.stringify()
```js
//app.js

const skills = ['HTML', 'CSS', 'JS', 'React','Node', 'Python']

console.log(JSON.stringify(skills))
```
1. Stringify the age variable
```js
//app.js

let age = 250;
console.log(JSON.stringify(age))
```
1. Stringify the isMarried variable
```js
//app.js

let isMarried = true
console.log(JSON.stringify(isMarried))
```
1. Stringify the student object
```js
//app.js

const student = {
  firstName:'Asabeneh',
  lastName:'Yetayehe',
  age:250,
  isMarried:true,
  skills:['HTML', 'CSS', 'JS', 'React','Node', 'Python', ]
}

console.log(JSON.stringify(student))
```

### Exercises Level 2

1. Stringify the students object with only firstName, lastName and skills properties
```js
//app.js

const student = {
  firstName:'Asabeneh',
  lastName:'Yetayehe',
  age:250,
  isMarried:true,
  skills:['HTML', 'CSS', 'JS', 'React','Node', 'Python', ]
};

const studentString = JSON.stringify({
  firstName: student.firstName,
  lastName: student.lastName,
  skills: student.skills
});

console.log(studentString);

```

### Exercises Level 3

1. Parse the *txt* JSON to object.
```js
//app.js

  const obj = JSON.parse(txt);
  console.log(obj);

```
2. Find the user who has many skills from the variable stored in *txt*.
```js
//app.js

const txt = {
  "Alex": {
      "email": "alex@alex.com",
      "skills": [
          "HTML",
          "CSS",
          "JavaScript"
      ],
      "age": 20,
      "isLoggedIn": false,
      "points": 30
  },
  "Asab": {
      "email": "asab@asab.com",
      "skills": [
          "HTML",
          "CSS",
          "JavaScript",
          "Redux",
          "MongoDB",
          "Express",
          "React",
          "Node"
      ],
      "age": 25,
      "isLoggedIn": false,
      "points": 50
  },
  "Brook": {
      "email": "daniel@daniel.com",
      "skills": [
          "HTML",
          "CSS",
          "JavaScript",
          "React",
          "Redux"
      ],
      "age": 30,
      "isLoggedIn": true,
      "points": 50
  },
  "Daniel": {
      "email": "daniel@alex.com",
      "skills": [
          "HTML",
          "CSS",
          "JavaScript",
          "Python"
      ],
      "age": 20,
      "isLoggedIn": false,
      "points": 40
  },
  "John": {
      "email": "john@john.com",
      "skills": [
          "HTML",
          "CSS",
          "JavaScript",
          "React",
          "Redux",
          "Node.js"
      ],
      "age": 20,
      "isLoggedIn": true,
      "points": 50
  },
  "Thomas": {
      "email": "thomas@thomas.com",
      "skills": [
          "HTML",
          "CSS",
          "JavaScript",
          "React"
      ],
      "age": 20,
      "isLoggedIn": false,
      "points": 40
  },
  "Paul": {
      "email": "paul@paul.com",
      "skills": [
          "HTML",
          "CSS",
          "JavaScript",
          "MongoDB",
          "Express",
          "React",
          "Node"
      ],
      "age": 20,
      "isLoggedIn": false,
      "points": 40
  }
};

const userWithMostSkills = Object.keys(txt).reduce((a, b) => txt[a].skills.length > txt[b].skills.length ? a : b);

console.log(`The user with the most skills is ${userWithMostSkills}.`);

```




 #### [Home](../README.md) | [<< Day 15](./15_day_classes.md) | [Day 17 >>](./17_day_wep%20storege.md)