Vladislav_Postnikov
/
HomeWork1


			
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172
							<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>Функции 2</title>
</head>
<body>

	<script>


//---------sort 

		/*let persons=[

			{name:'Ivan',age:17},

			{name:'Maria',age:35},

			{name:'Aleksei',age:73},

			{name:'Iykov',age:12}

		];


		function sort(arr,field,bool=true){

			if(bool==false){

				arr.sort((a,b)=>a[field]>b[field]?-1:1);

			}

			if(bool==true){

				arr.sort((a,b)=>a[field]>b[field]?1:-1);

			}

		}


		sort(persons,'age');

		console.log(persons);*/

		/*so(persons,'name',false);

		console.log(persons);*/


//---------array map (done)

		/*let arr=['1',{},null,undefined,'500',700];


		let arr2=arr.map(function(x){

			if(x===String(x)){

				return Number(x);

			}

			return x;

		})

		console.log(arr2);


		let arr2 = function mAp(arr){

			let arr2=[];

			for(let num of arr){

				if(num===String(num)){

					arr2.push(Number(num));

				}else{

					arr2.push(num);

				}

			}

			return arr2;

		}

		console.log(arr2(arr))*/


//---------array reduce (done)

		/*let arr=['0',5,3,'string',null];

		let num=arr.reduce((res,num)=>{

			if(num===Number(num)){

				res*=num;

			}

			return res;

		},1);

		console.log(num); //15 


		let num2=function(arr){

			let res=1;

			for(let i of arr){

				if(i===Number(i)){

					res*=i;

				}

			}

			return res;

		}

		console.log(num2(arr)); //15*/


//----------object filter

		/*let phone={

			brand:'meizu',

			model:'m2',

			ram:2,

			color:'black'

		};


		function filter(obj,cb){

			return Object.entries(obj).filter(e => cb(...e)).reduce((a,[b, c] = b) => (a[b] = c, a),{});

		}


		console.log(filter(phone,(key,value)=>key=='color'|| value==2));*/


//---------object map

		/*function map(obj,cb){

			let obj2 = {};

			for(var key in obj){

				Object.assign(obj2,cb(key, obj[key]));

			}  

			return obj2;

		}


		console.log(map({name:"Ivan",age:17},function(key,value){

			let result={};

			result[key+'_']=value+'$';

			return result;

		}));*/


//---------sum (done)

		/*function sum(n){

			if(n==1){

				return n;

			}else{

				return n+sum(n-1);

			}

		}

		console.log(sum(10));*/

		
//----------HTML Tree (blue belt - recursive) (done)

		/*var someTree = {

    		tagName: "table", 

    		subTags: [ 

        		{

                    tagName: "tr",

                    subTags: [

                        {

                           	tagName: "td",

                            text: "some text",

                        },

                        {

                            tagName: "td",

                            text: "some text 2",

                        }

                    ]

        		}

    		],

    		attrs: {

        		border: 1,

    		},

		}


		let str='';


		function createTree(obj){

			for(let item in obj){

				if(item=='tagName'){

					if(obj[item]=='table'){

						let [key] = Object.keys(someTree['attrs']);

						let [value]= Object.values(someTree['attrs']);

						str+=`<${someTree['tagName']} ${key}=${value}>`;

					}else{

						str+=`<${obj['tagName']}>`;

					}

				}

				if(item=='subTags'){

					for(let item2 of obj[item]){

						createTree(item2);

					}

				}

				if(item=='text'){

					str+=`${obj['text']}`;

				}

			}

		}


		createTree(someTree);

		console.log(str);

		document.write(str);*/

		
	</script>
</body>
</html>