/* let body ={
    tagName: 'body',
    children: [
        {tagName: 'div',
        children: [{tagName: 'span', 
        children:["Enter a data please"]}, {tagName: 'input', attrs: {id: 'name',type:'text' }}, 
        {tagName: 'input', attrs: {id: 'surname',type:'text' }}, 
        {tagName: '/br'}
    ]},
    {tagName: 'div',
    children: [{tagName: 'button', attrs:{id : 'id'}},
    {tagName: 'button', attrs:{id: 'cancel'}}
]}
    ]
}

console.log(body.children[0].children[0].children);
console.log(body.children[1].children[1].attrs.id); */

/* 
<table border='1'>
    <tr>
        <td>
            1x1
        </td>
        <td>
            1x2
        </td>
    </tr>
    <tr>
        <td>
            2x1
        </td>
        <td>
            2x2
        </td>
    </tr>
</table>
 */
/* let table = {
    tagName : 'table',
    attrs : {
        border: '1'
    },
    subTags: [
        {
            tagName: 'tr',
            subTags: [{
                tagName: 'td',
                textInCell: '1x1'
            },
        {
                tagName:'td',
                textInCell: '1x2'
        }]},
        {
            tagName: 'tr',
            subTags: [{
                tagName: 'td',
                textInCell: '2x1'
            },
        {
                tagName: 'td',
                textInCell: '2x2'
        }]
        }
    ]
}
console.log(table.subTags[0].subTags[0].textInCell);
console.log(table.subTags[1].subTags[1].textInCell); */ 

/* let boddy = document.getElementById('body');

//multiplay table
let table = document.createElement('table')
let tbody = document.createElement('tbody')


for(let rowIndex = 1; rowIndex<10; rowIndex++){

    let rows = document.createElement('tr');

    for(let cellIndex = 1; cellIndex<10; cellIndex++){
            let cell = document.createElement('td');
            let cellText = document.createTextNode(rowIndex*cellIndex);
            cell.appendChild(cellText);
            rows.appendChild(cell);
    }
    tbody.appendChild(rows);
}
table.appendChild(tbody);
boddy.appendChild(table);

 */
/* let str = '<table>';
for (let rowIndex = 1; rowIndex<10; rowIndex++){
    str+='<tr>';
    for(let cellIndex =  1; cellIndex<10; cellIndex++) {
        str+=`<td>${rowIndex*cellIndex}</td>`;

    }
    str+='</tr>'
}
str+='</table>';
document.write(str); */

/* let person = {
    name: prompt("Input your name", ""),
    surname: prompt("Input your surname", ""),
    married: confirm('You are married?'),
}
let notebook = {
    brand: prompt("Input brand of Notebook", ""),
    type:  prompt("Input type of Notebook", ""),
    model: prompt("Input model of Notebook", ""),
    ram: +prompt("Input ram of Notebook", ""),
    size: prompt("Input size of Notebook", ""),
    weight: +prompt("Input weight of Notebook", ""),
    resolution: {
        width: +prompt("Input width of screen on Notebook", ""),
        height: +prompt("Input height of screen on Notebook", ""),
    },
    
};

let phone = {
    brand: prompt("Input brand of Phone", ""),
    model: prompt("Input model of Phone", ""),
    ram: +prompt("Input ram of Phone", ""),
    color: prompt("Input color of Phone", ""),
    
};



person.notebook = notebook;
notebook.owner = person;
person.phone = phone;
phone.owner = person;


console.log(person.phone.owner.notebook.owner.phone == person.phone); */

/* let eternalLoop = confirm("press no pls")
while(!eternalLoop){
    eternalLoop = confirm("press no pls");
} */
/* infinite probability */
/* let i = 0;
for(;;) {
    i++;
    if(Math.random() > 0.9){
        alert(`count of iterations ${i}`);
        break;
    }
} */


/* empty loop */
/* while(null == prompt('press no to continue', "")){

} */

/* cubes */
/* 
function promotionToHigherValue(arr,f) {
    let result = [];
    for(let item of arr) {
        result.push(f(item));
    }
    console.log(result);
}
promotionToHigherValue([1,2,3,4,5], x => x**3); */

/* progression sum */
/* let sum = 0;
let lengthOfProgression = +prompt("input length of prgression", '');
for (let i = 1; i<=lengthOfProgression; i+=3){
    sum=sum + i;
}
alert(sum); */


/* how to write christmas tree */
/* 
 const buildTree = tier => {
 
 //  more interesting solution but for me hard understand to make it by myself 
    let s = Array(tier - 1).join(' ');
    for (s = s + '#' + s; tier--; console.log(s), s = s.replace(/\s(#+)\s/, '#$1#'));
  }
  buildTree(15); /* from internet solution and that so hard to understand how that magic works*/  
 
/*  */
 /*  function pyramid(n) {
      for(let i = 1; i <= n; i++){
          let s = "";
          for(let j = 1; j<=(2*n -1); j++){
              (j>= n+1-i && j<= n-1+i) ? s+="#" : s+=".";
          }
          console.log(s);
      }
  }

  pyramid(+prompt("input number of tree rows", '')); */