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 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>