javascript-hash-problems

###Problem 1

Convert this string

string = "{key:[[value_1, value_2],[value_3, value4]], 5:10:00AM]}"

to this hash:

h = {"key" => [["value_1", "value_2"],["value_3", "value4"]], 5=>"10:00AM"}

then convert h to JSON. Please note that the brackets are unbalanced on purpose.

Solution

var hash = "{firstKey:value0, key:[[value_1, value_2],[value_3, value4]], 5:10:00AM]}";

function hashify(jsonString) {
	s = jsonString.replace(/(\s*?{\s*?|\s*?,\s*?)(['"])?([a-zA-Z0-9]+)(['"])?:/g, '$1"$3":'); //Add quotes for keys
	s = s.replace(/(\d\d\:\d\d\w\w)\]/, '$1'); //remove trailing brackets.
	s = s.replace(/:((?:(?![\["]).)[A-z0-9:]+)/g, ':"$1"'); //add quotes to every value except an array value
	s = s.replace(/([a-z0-9+_]+?(?=[ \],]))/g, '"$1"'); //add quotes to every array value

	try{
		var h = JSON.parse(s);
	}catch(e){
		console.log("Don't want to end up here!")
	}

	return h;
}

function stringify(object) {
	if (typeof object !== 'object') {
		console.log('Don`t to this!');
	}	

	try{
		var j = JSON.stringify(object);
	}catch(e){
		console.log("Don't want to end up here!")
	}

	return j;
}

var h = hashify(hash);
var j = stringify(h);

console.log(h);
console.log(j);

Problem 2

Write a class Sample whose initialize method takes an arbitrary hash, e.g.

h = {"this" => [1,2,3,4,5,6], "that" => ['here', 'there', 'everywhere'], :other => 'here'}

and represent each key in the hash as an attribute of an instance of the class, such that I can say:

c = Sample.new(h)

and then

c.this` should return `[1,2,3,4,5,6]

c.that`  should return `['here', 'there', 'everywhere']

c.other` should return `’here’

Solution

function Sample(obj) {
    for(var key in obj) {
    	if (obj.hasOwnProperty(key)) {
      	    	this[key] = obj[key];
    		}
   		}
    }

var sampleObj = new Sample({"this":[1,2,3,4,5,6], "that":['here', 'there', 'everywhere'], "other": 'here'});