Stringify a javascript object to string(not JSON) and vice versa

js_stringify.js

	function js_stringify(obj){											
		switch(typeof(obj)){
			case 'string':   
				return '"'+ obj + '"' ;
			break;
			case 'undefined':case 'number':case 'boolean': case 'null':   
				//undefined=String(undefined);
				return String(obj) ;
			break;
			case 'function':   
				return obj.toString();
			break;
			case 'object':
				if (!obj) {
					return "null";
				}
				if (obj instanceof Date){
					//return	'(new Date("' +  obj.toISOString()  + '"))';
					//d=new Date("2018-05-22T06:34:28.659Z");
					//return 'function(){ return new Date('+obj.getTime()+');}()';
					return	'new Date("' +  obj.toISOString()  + '")';
				}else{
					if (!Array.isArray) {
						Array.isArray = function(obj) {
						  return Object.prototype.toString.call(obj) == '[object Array]';
						}
					}
					//if (Object.prototype.toString.call(obj) == '[object Array]') {
					//if(Array.isArray (obj)){	
					var is_array=obj.constructor === Array;
					if(is_array){
						var str='[';
						var	l = obj.length;
						var j=0;
						for (var i = 0; i < l; i++) {
							if(j>0){
								str+=',';
							}
							str+=js_stringify(obj[i]) ;
							j+=1;
						}
						str+=']';
						return str;
					}else{//object
						var str='{';
						var j=0;
						for(var a in obj){
							if(j>0){
								str+=',';
							}
							str+=String(a) + ':' + js_stringify(obj[a]) ;
							j+=1;
						}
						str+='}';
						return str;
					}
				}
			break;

		}
		/*	in console
			var a={m:[[0,1],[0,2],[0,3]]};
			var a={a:function (){alert("ok");},b:function(){ return new Date(1526975358084);}(),c:[1,2,3],d:'sdsd',e:true,f:123};
			var a={a:'dds',x:10,d:new Date(),ar:[1,2,3] ,obj:{ t:'t', q:[4,5,6]} ,m:[[0,1],[0,2],[0,3]] ,f:function(){alert('ok');}  };
			var b=js_stringify(a);
			eval('var c='+ b + ';');
			c;
				// 	or
			var c = new Function('return ' + b )();
			c;

		*/
		/* 				
		* 				All honour and glory and thanks and praise and worship belong to him, my Lord Jesus Christ.
		* 				All honour and glory and thanks and praise and worship belong to him, my Lord Jesus Christ.
		* 				All honour and glory and thanks and praise and worship belong to him, my Lord Jesus Christ.
		*/
	}