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Convert string to JSON stringformat

I have a string where the object name is separated by dot from the field name as follows:
{\"person.firstName\":\"Ahmed\",\"person.job\":\"Doctor\",\"products.packName\":\"antibiotic\",\"products.packSize\":\"large\"}}";
I want to parse it to look like the json format:
"{\"person\": {\"firstName\":\"Ahmed\",\"job\":\"Doctor\",},\"products\": {\"packName\":\"antibiotic\",\"packSize\":\"large\"}}";
Is there an efficient algorithm for that?

Maybe this is help for you.
var str='{\"person.firstName\":\"Ahmed\",\"person.job\":\"Doctor\",\"products.packName\":\"antibiotic\",\"products.packSize\":\"large\"}';
var newObj={}
var json=JSON.parse(str);
for (i in json) {
var splt=i.split('.');
var key=splt[0];
var subkey=splt[1];
if(!(key in newObj)) {
newObj[key]={};
}
newObj[key][subkey]=json[i];
}
//if you need string use str or not use newObj
var str=JSON.stringify(newObj);
console.log(str);
console.log(newObj);
console.log(newObj.person);
console.log(newObj.person.firstName);
console.log(newObj.person.job);

Assuming left side may have multiple dots
let parsedObj = JSON.parse(<..YOUR STRINGIFIED JSON..>);
let myObj = {};
Object.keys(parsedObj).forEach((key) => {
let val = parsedObj[key];
let subKeys = key.split(".");
let currentRef = myObj;
subKeys.forEach((subKey, idx) => {
if(idx === subKeys.length - 1) {
currentRef[subKey] = val;
} else {
currentRef[subKey] = currentRef[subKey] || {};
currentRef = currentRef[subKey];
}
});
});
let finalString = JSON.stringify(myObj);
P.S. Your string seems to contain an extra } in the end

I want to convert the below array

I want to convert the below array:
["A:100","B:234","C:124","D:634","E:543","F:657"];
Into:
["100:234:124:634:543:657"];
How to do this?

So not sure why you would want that particular output since it would just be a single item in an array but this should work:
var testArray = ["A:100","B:234","C:124","D:634","E:543","F:657"];
var resultArray = [];
for(var i = 0; i < testArray.length; ++i) {
resultArray.push(testArray[i].split(':')[1]);
}
var strValue = resultArray.join(':');
console.log(strValue);
resultArray = [strValue];
console.log(resultArray);

You could iterate the array, return the number on the right and join it with ':'.
var data = ["A:100","B:234","C:124","D:634","E:543","F:657"],
result = [data.map(function (a) {
return a.match(/\d*$/);
}).join(':')];
console.log(result);
Or a bit shorter
var data = ["A:100","B:234","C:124","D:634","E:543","F:657"],
result = [data.map(RegExp.prototype.exec.bind(/\d*$/)).join(':')];
console.log(result);

<script>
var arr=["A:100","B:234","C:124","D:634","E:543","F:657"];
var str='';
for(var i=0;i<arr.length;i++){
str+=arr[i].split(":")[1]+":";
}
console.log(str.substring(0, str.length - 1));
</script>

You could just keep the number behind ":" and join new elements with ":"
var data = ["A:100","B:234","C:124","D:634","E:543","F:657"];
var results = [data.map(x => x.split(":")[1]).join(":")];
console.log(results);

You join it with what you want :, split it by what you don't won't /\D\:/ (non digit followed by :), and then join it using an empty string '':
var arr = ["A:100","B:234","C:124","D:634","E:543","F:657"];
var result = [arr.join(':').split(/\D\:/).join('')];
console.log(result);

how to convert json values in comma separated string using javascript

I have following JSON string :
{"name":"Marine Lines","location_id":3},{"name":"Ghatkopar","location_id":2}
I want location_id as
3,2

Simple:
var data = [{"name":"Marine Lines","location_id":3},{"name":"Ghatkopar","location_id":2}]
var result = data.map(function(val) {
return val.location_id;
}).join(',');
console.log(result)
I assume you wanted a string, hence the .join(','), if you want an array simply remove that part.

You could add brackets to the string, parse the string (JSON.parse) and map (Array#map) the property and the join (Array#join) the result.
var string = '{"name":"Marine Lines","location_id":3},{"name":"Ghatkopar","location_id":2}',
array = JSON.parse('[' + string + ']'),
result = array.map(function (a) { return a.location_id; }).join();
console.log(result);

obj=[{"name":"Marine Lines","location_id":3}, {"name":"Ghatkopar","location_id":2}]
var res = [];
for (var x in obj)
if (obj.hasOwnProperty(x))
res.push(obj[x].location_id);
console.log(res.join(","));

var json = [{"name":"Marine Lines","location_id":3},{"name":"Ghatkopar","location_id":2}];
var locationIds = [];
for(var object in json){
locationIds.push(json[object].location_id);
}
console.log(locationIds.join(","));

You can also look into .reduce and create a string manually
var d = [{"name":"Marine Lines","location_id":3},{"name":"Ghatkopar","location_id":2}]
var location_id_str = d.reduce(function(p, c) {
return p ? p + ',' + c.location_id : c.location_id
},'');
console.log(location_id_str)

try this
var obj = [{"name":"Marine Lines","location_id":3},{"name":"Ghatkopar","location_id":2}];
var output = obj.map( function(item){
return item.location_id;
});
console.log( output.join(",") )

var arr = [{"name":"Marine Lines","location_id":3},{"name":"Ghatkopar","location_id":2}];
var location_array = [];
for( var i = 0; i < arr.length; i++ )
{
location_array.push( arr[i].location_id );
}//for
var location_string = location_array.join(",");
console.log(location_string);
Note: You may need to use JSON.parse() if the arr is in string format initially.

You can use for..of loop
var arr = [{
"name": "Marine Lines",
"location_id": 3
}, {
"name": "Ghatkopar",
"location_id": 2
}];
var res = [];
for ({location_id} of arr) {res.push(location_id)};
console.log(res);

Loop thru a string with numbers and symbols & push to array

I'm trying to loop thru a string with numbers that has a symbol inside, I want the numbers before the symbol to be pushed to an array then the symbol to another array and then get the rest of the numbers after the symbol pushed to a 3rd array.
var myString = "1234*5678";
var number1 = [];
for (i = 0; i < myString.length; i++) {
if (isNaN(myString[i]) === false) {
var firstSet = number1.push(myString[i]);
}
};
var mySymbol = [];
for (j = number1[0]; j < myString.length; j++) {
if (isNaN(myString[j]) === true) {
var mathematics = mySymbol.push(myString[j])
document.write(mySymbol[0])
}
};
when I document.write the "mySymbol" variable it gives the desired result, but when I call the "number1" variable it gives me the numbers from before and after the symbol I only want the numbers before the symbol to be pushed to the array, also how do I write the 3rd loop to get the numbers after the symbol pushed to a new array?

try
var arr=[[],[],[]]
index = 0
"1234*5678".split('').forEach(function(e){
if(parseInt(e)){
arr[index].push(e);
}else{
index ++;
arr[index++].push(e)
}
});
document.write('First Array ' +arr[0] + '<br>');
document.write('Secont Array ' +arr[1] + '<br>');
document.write('Third Array ' +arr[2]);

You could try using:
var myString = '1234*5678';
var resultArr = myString.match(/([a-zA-Z0-9]+)([^a-zA-Z0-9])([a-zA-Z0-9]+)/);
To get the string before symbol:
var myFirstSet = resultArr[1];
To get symbol:
var mySymbol = resultArr[2];
To get the string after symbol:
var mySecondSet = resultArr[3];
To convert each of these three groups into their own arrays:
var result = [];
resultArr
.slice(1)
.forEach(
function(s){
result.push(s
.split('')
.map(
function(n){
return parseInt(n) || n;
}
)
)
}
);

The following code accomplishes the goal:
var str = '1234*5678';
var arr = str.match(/([a-zA-Z0-9]+)|\*/g);
console.log(arr[0], arr[1], arr[2]);
http://jsfiddle.net/hp2ohvzb/

how to get values from an array in javascript?

let the array be
var array=
[
"me=Salman","Profession=student","class=highschool"
]
How do I extract the value of 'me' here?

Try this:
var result = '';
for(var values in array){
if(values.indexOf('me=') !== -1 ){
result = values.split('=')[1];
break;
}
}

You will need to search the array for your desired portion of the string, then remove what you searched for from the indicated string.
var array = [ "me=Salman" , "Profession=student" , "class=highschool" ];
var findMatch = "me=";
var foundString = "Did not find a match for '"+findMatch+"'.";
var i = 0;
for (i = 0; i<array.length; i++) //search the array
{
if(array[i].indexOf(findMatch) != -1) // if a match is found
{
foundString = array[i]; //set current index to foundString
foundString = foundString.substring(findMatch.length, array[i].length); //remove 'me=' from found string
}
}

Try this:
var a = [ "me=Salman" , "Profession=student" , "class=highschool" ];
var result = a.filter(function(e){return /me=/.test(e);})[0]; // Find element in array
result = result.length ? result.split('=').pop() : null; // Get value
Or function:
var array = [ "me=Salman" , "Profession=student" , "class=highschool" ];
function getVal(arr, key){
var reg = new RegExp(key + '=');
var result = arr.filter(function(e){ return reg.test(e)})[0];
return result.length ? result.split('=').pop() : null;
}
console.log( getMe(array, 'me') );