Vladislav_Postnikov
/
HomeWork1


			
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							<!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 so(arr,field,bool=true){

			if(bool==false){

				for(let i of arr){


				}

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

			}

			if(bool==true){

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

			}

		}


		/*function so(arr,field,bool=true){

			in process

		}*/


		so(persons,'age',false);

		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){

			//in process

		}


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


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

		//in process


//---------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>