Develop Reference

XML To JSON Conversion with attributes

I am trying to convert the XML to JSON.Here am facing challenge my xml have #attributes name as "value" in all tag. while convert into xml to JSON i am using the below code.
var xml = "<Message><id value="123"></id><type value="Test"></type></Message>"
var json = XMLtoJSON(xml, ["type", "space", "xmlns", "html"]);
var result = JSON.stringify(json)
function XMLtoJSON(xml, ignored) {
var r, children = xml.*, attributes = xml.#*, length = children.length();
if(length == 0) {
r = xml.toString();
} else if(length == 1) {
var text = xml.text().toString();
if(text) {
r = text;
}
}
if(r == undefined) {
r = {};
for each (var child in children) {
var name = child.localName();
var json = XMLtoJSON(child, ignored);
var value = r[name];
if(value) {
if(value.length) {
value.push(json);
} else {
r[name] = [value, json]
}
} else {
r[name] = json;
}
}
}
if(attributes.length()) {
var a = {}, c = 0;
for each (var attribute in attributes) {
var name = attribute.localName();
if(ignored && ignored.indexOf(name) == -1) {
a["_" + name] = attribute.toString();
c ++;
}
}
if(c) {
if(r) a._ = r;
return a;
}
}
return r;
}
Input XML :
<Message><id value="123"></id><type value="Test"></type></Message>
Actual Output:
{"id":{"_value":"123"},"type":{"_value":"Test"}}
Expected Output:
{"id":"123","type":"Test"}
Guide me where am missing the part to get the expected output.
Regards,
nkn1189

do you think if you do this way will work for you?
put your actual output from that parser to this function:
function convertToExpectedOutput(obj){
var result = {}
for (var i in obj){
if (i == "_value")
return obj[i];
else
result[i] = convertToExpectedOutput(obj[i])
}
return result;
}
convertToExpectedOutput(actualOutput)
So, for your array, hange the convertToExpectedOutput to this way and it will give the expected result:
function convertToExpectedOutput(obj){
var result = {}
for (var i in obj){
if (i == "_value")
return obj[i];
else
if (Array.isArray(obj[i])){
result[i] = [];
arr = obj[i]
for (var j in arr)
result[i].push(convertToExpectedOutput(arr[j]))
}
else
result[i] = convertToExpectedOutput(obj[i])
}
return result;
}

Create Array of Objects and count number of occurrence

I have an array of objects and want to create another array of objects based on.
I want to check if an object is repeated just want to show the count, otherwise show the object itself with count = 1.
<!-- I have an array-->
var arr =[{name:"coke",price:20},{name:"coke",price:20},{name:"coke",price:20},{name:"kabab",price:250}];
// I want to create another array based on "arr" like the one below
var test =[{name:"coke",price:20,count:3},{name:"kabab",price:20,count:1}];
//Any hint please

This may help you. This answer considers name or some identifier will be unique for each object.
counter = {}
var arr = [{
name: "coke",
price: 20
}, {
name: "coke",
price: 20
}, {
name: "coke",
price: 20
}, {
name: "kabab",
price: 250
}];
var obj = {};
var counter = {}
for (var i = 0, len = arr.length; i < len; i++) {
obj[arr[i]['name']] = arr[i];
counter[arr[i]['name']] = (counter[arr[i]['name']] || 0) + 1
}
newArr = new Array();
for (var key in obj){
newArr.push(extend( obj[key], {count:counter[key]}));
}
function extend(a, b){
for(var key in b)
if(b.hasOwnProperty(key))
a[key] = b[key];
return a;
}
console.log(newArr)

var arr =[{name:"coke",price:20},{name:"coke",price:20},{name:"coke",price:20},{name:"kabab",price:250}];
var countNameMapping = {}, finalArr = [];
var arrLength = arr.length;
for(i=0; i<arrLength; i++){
var tempObj = {name:arr[i], price:arr[i].price, occurance:1};
var productName = arr[i].name;
if(countNameMapping[productName] === undefined){
countNameMapping[productName] = tempObj;
}else{
countNameMapping[productName].occurance += 1;
}
}
for(var k in countNameMapping){
finalArr.push(countNameMapping[k])
}
console.log(finalArr );

You can try this one:
var arr =[{name:"coke",price:20},{name:"coke",price:20},{name:"coke",price:20},{name:"kabab",price:250}];
var result = [];
arr.map(function(arrObject) {
if (result.length > 0) {
result.map(function(resultObject) {
if (resultObject.name != arrObject.name) {
arrObject.count = 1;
result.push(arrObject);
} else {
resultObject.count++;
}
})
} else {
arrObject.count = 1;
result.push(arrObject);
}
})
console.log(result);

This will provide the result you are looking for:
var arr =[{name:"coke",price:20},{name:"coke",price:20},{name:"coke",price:20},{name:"kabab",price:250}];
var map = arr.reduce((accum, item) => {
var obj = accum.get(item.name) || Object.assign({}, item, {count:0});
obj.count++;
return accum.set(item.name, obj);
}, new Map());
var res = [...map.values()];

More or less...
var arr = [{
name: "coke",
price: 20
}, {
name: "coke",
price: 20
}, {
name: "coke",
price: 20
}, {
name: "kabab",
price: 250
}];
// I want to create another array based on "arr" like the one below
// var test =[{name:"coke",price:20,count:3},{name:"kabab",price:20,count:1}];
var count = {};
var test = [];
for (var i = 0, len = arr.length; i < len; i++) {
var id = JSON.stringify(arr[i]);
if (count.hasOwnProperty(id)) {
count[id].count++;
} else {
test.push(arr[i]); // Data contamination. Too lazy to copy object
count[id] = test[test.length - 1]; // Could be better.
count[id].count = 1;
}
}
console.log(test);

This is probably what are you looking for:
How does it work?
First, your array arr will use a forEach loop to find each object and if if new you will add it to the results array. The method isNew() will return true if the object is new.
For each new object founded you will count the number of occurrences using findOccurrences() To reduce the number of "loops" you will slice the array according to the index. So you don't need to search again over the already processed data.
So now you can build an new object, using the name, price and count.
Finally, you can push() the new object to the results array.
var arr =[{name:"coke",price:20},{price:20,name:"coke"},{name:"coke",price:20},{name:"kabab",price:250}];
var results = [];
var index = 0;
var originalDiv = document.getElementById('original');
var resultsDiv = document.getElementById('results');
arr.forEach(function(obj) {
if (isNew(obj)) {
var counter = findOccurrences(obj, arr.slice(index, arr.length));
var newObj = {
name: obj.name,
price: obj.price,
count: counter
}
results.push(newObj);
}
index++;
});
printArray(arr, originalDiv);
printArray(results, resultsDiv);
function isNew(newObj) {
var wasFound = true;
if (typeof results != "undefined" && results != null && results.length > 0) {
results.forEach(function(obj) {
if (newObj.name === obj.name && newObj.price === obj.price) {
return false;
} else {
wasFound = false;
}
});
return !wasFound;
} else {
return true;
}
}
function findOccurrences(newObj, objects) {
var count = 0;
if (typeof objects != "undefined" && objects != null && objects.length > 0) {
objects.forEach(function(obj) {
if (newObj.name === obj.name && newObj.price === obj.price) {
count++;
}
});
}
return count;
}
function printArray(objects, div) {
var count = 0;
if (typeof objects != "undefined" && objects != null && objects.length > 0) {
objects.forEach(function(obj) {
var newElement = document.createElement('p');
newElement.innerHTML = 'item ' + count + ': ';
Object.keys(obj).forEach(function(key) {
newElement.innerHTML += key + ': ' + obj[key] + ', ';
});
newElement.innerHTML = newElement.innerHTML.slice(0, -2);
div.appendChild(newElement);
count++;
});
}
}
<div id="original"><p>Original Array</p></div>
<div id="results"><p>Results Array</p></div>
Update:
More optimization.
var arr =[{name:"coke",price:20},{name:"coke",price:20},{name:"coke",price:20},{name:"kabab",price:250},{name:"coke",price:20},{name:"coke",price:20},{name:"kabab",price:250}];
var accumulator = {};
var results = [];
var index = 0;
var originalDiv = document.getElementById('original');
var resultsDiv = document.getElementById('results');
String.prototype.hashCode = function() {
var hash = 0;
if (this.length == 0) return hash;
for (i = 0; i < this.length; i++) {
var char = this.charCodeAt(i);
hash = ((hash << 5) - hash) + char;
hash |= 0; // Convert to 32bit integer
}
var c = (hash & 0x0FFFFFFF)
.toString(16)
.toUpperCase();
return '0000000'.substring(0, 7 - c.length) + c;
};
arr.forEach(function(obj) {
var id = JSON.stringify(obj).hashCode();
console.log(id);
if (accumulator.hasOwnProperty(id)) {
accumulator[id].count++;
} else {
results.push(obj);
accumulator[id] = results[results.length - 1];
accumulator[id].count = 1;
}
});
printArray(arr, originalDiv);
printArray(results, resultsDiv);
function printArray(objects, div) {
var count = 0;
if (typeof objects != "undefined" && objects != null && objects.length > 0) {
objects.forEach(function(obj) {
var newElement = document.createElement('p');
newElement.innerHTML = 'item ' + count + ': ';
Object.keys(obj).forEach(function(key) {
newElement.innerHTML += key + ': ' + obj[key] + ', ';
});
newElement.innerHTML = newElement.innerHTML.slice(0, -2);
div.appendChild(newElement);
count++;
});
}
}
<div id="original">
<p>Original Array</p>
</div>
<div id="results">
<p>Results Array</p>
</div>

Find array value

My array:
var PrivateChatList = [];
And push key and value (just example):
PrivateChatList['supporter1'] = 'player1';
PrivateChatList['supporter2'] = 'player2';
PrivateChatList['supporter3'] = 'player3';
PrivateChatList['supporter4'] = 'player4';
PrivateChatList['supporter5'] = 'player5';
PrivateChatList['supporter6'] = 'player6';
PrivateChatList['supporter7'] = 'player7';
I want to find "player4" key on function. How can i find ?

function getObjectKeyFromValue(object, value)
{
for(var k in object)
{
if(object[k] == value)
{
return k;
}
}
return '';
}
var key = getObjectKeyFromValue(PrivateChatList, 'player4')
alert(key); // 'supporter4'

Readability of Javascript Array

I have a JSON OBJECT similar to following
{
"kay1":"value1",
"key2":"value2",
"key3":{
"key31":"value31",
"key32":"value32",
"key33":"value33"
}
}
I want to replace that with JSON ARRAY as follows
[
"value1",
"value2",
[
"value31",
"value32",
"value33"
]
]
My motivation to change the the JSON OBJECT to JSON ARRAY is it takes less amount of network traffic, getting the value from ARRAY is efficient than OBJECT, etc.
One problem I face is the readability of the ARRAY is very less than OBJECT.
Is there any way to improve the readability?

Here you go, I have written a function which will convert all instances of object to array and give you the result you are expecting.
var objActual = {
"key1":"value1",
"key2":"value2",
"key3":{
"key31":"value31",
"key32":"value32",
"key33": {
"key331" : "value331",
"key332" : "value332"
}
}
};
ObjectUtil = {
isObject : function(variable) {
if(Object.prototype.toString.call(variable) === '[object Object]') {
return true;
}
return false;
},
convertToArray : function(obj) {
var objkeys = Object.keys(obj);
var arr = [];
objkeys.forEach(function(key) {
var objectToPush;
if(ObjectUtil.isObject(obj[key])) {
objectToPush = ObjectUtil.convertToArray(obj[key]);
} else {
objectToPush = obj[key];
}
arr.push(objectToPush);
});
return arr;
}
};
var result = ObjectUtil.convertToArray(objActual);
console.log(result);

In my opinion, it should be:
{
"kay1":"value1",
"key2":"value2",
"key3":["value31", "value32", "value33"]
}

Using the init method is time critical. So use a scheme or assign static JSON to Storage.keys and assign your bulk data array to store.data. You can use store.get("key3.key31") after that. http://jsfiddle.net/2o411k00/
if (!Array.prototype.map)
{
Array.prototype.map = function(fun /*, thisp*/)
{
var len = this.length;
if (typeof fun != "function")
throw new TypeError();
var res = new Array(len);
var thisp = arguments[1];
for (var i = 0; i < len; i++)
{
if (i in this)
res[i] = fun.call(thisp, this[i], i, this);
}
return res;
};
}
var data = {
"kay1":"value1",
"key2":"value2",
"key3":{
"key31":"value31",
"key32":"value32",
"key33":"value33"
}
}
var Storage = function(data){
this.rawData = data;
return this;
}
Storage.prototype.init = function(){
var self = this;
var index = 0;
var mp = function(dat, rootKey){
var res = Object.keys(dat).map(function(key, i) {
var v = dat[key];
if (typeof(v) === 'object'){
mp(v, key);
} else {
self.data.push(v);
var nspace = rootKey.split(".").concat([key]).join(".");
self.keys[nspace] = index++;
}
});
}
mp(this.rawData, "");
}
Storage.prototype.get = function(key){
return this.data[this.keys[key]];
};
Storage.prototype.data = [];
Storage.prototype.keys = {};
var store = new Storage(data);
console.log(data);
store.init();
console.log("keys", store.keys);
console.log("data", store.data);
console.log("kay1=", store.get(".kay1"));
console.log("key2=", store.get(".key2"));
console.log("key3.key31=", store.get("key3.key31"));
console.log("key3.key32=",store.get("key3.key32"));
console.log("key3.key33=", store.get("key3.key33"));

An alternative method for JSON.stringify()

I want an alternative method for JSON.stringify().
I am using JSON.stringify and I got error like cyclic object value. I don't know how to remove this error so I'd like to know if there's an alternative method.
DCSSPACE.SaveAndOpenJSONWriter = function(canvas) {
//multiple tab.....
var mydata = [];
var area = {}, DCS = {}, workspace = {};
var len = DCSSPACE.collection.length;
for (var k = 0; k < len; k++) {
var result = [];
var tabid = DCSSPACE.collection.models[k].id;
var canvas = DCSSPACE.collection.get(tabid).get("workflow");
//for node
var figures = canvas.getFigures();
for (var i = 0; i < figures.getSize(); i++) {
if (figures.get(i).type == "draw2d.Node") {
var node = {};
node.blockType = getBlockType(figures.get(i));
node.x = figures.get(i).getX();
node.y = figures.get(i).getY();
node.id = figures.get(i).getId();
node.type = figures.get(i).type;
node.width = figures.get(i).getWidth();
node.height = figures.get(i).getHeight();
node.label = figures.get(i).getLabel();
node.sequenceNo = figures.get(i).getSequenceNo();
node.model = figures.get(i).model;
result.push(node);
}
}
//for lines
var lines = canvas.getLines();
for (var j = 0; j < lines.getSize(); j++) {
if (lines.get(j).type == "draw2d.nodeConnetion") {
var nodeConnection = lines.get(j).getConnectionAttrubutes();
nodeConnection.source = lines.get(j).getSource();
nodeConnection.target = lines.get(j).getTarget();
result.push(nodeConnection);
}
}
area = {
tabid : tabid,
attr : result
};
mydata.push(area);
result=[];
workspace = {
DCS : mydata
};
}
//console.log(mydata);
var arr = JSON.stringify(workspace, null, 4);
console.log(arr);
DCSSPACE.SaveAndLoadFigure = result;
return workspace;
};

If won't to use stringify you can reproduce it, like this:
OBJtoString(object [,n]) accempt 2 args:
object (needed) the object you need to log (in my release array and object is the same)
n numbero of space that indent every new line inside object aruments.
var OBJtoString = function(_o,_m,_rf,_dep,_res){
_dep = [],
_rf = function(obj,n,_n,_a,_k,_i,_ws,_f,_e){
if(typeof obj != "object") return false;
if(typeof _a === "undefined") _a = "FIRST PARENT OBJECT";
_dep.push(obj),
_f = (_dep.length < 1) ? function(){} : function(_z,_x){
for(_x = 0; _x <= _dep.length; _x++){
if(obj[_z] == _dep[_x]) return true;
}
return false;
}
_ws = "";
if(typeof n === "undefined") n = 1;
if(typeof _n === "undefined") _n = n;
for(_k = 0; _k <= n; _k++){
_ws += " ";
}
var response ="{ \n";
for(var _i in obj){
if(typeof obj[_i] !== "object"){
if(typeof obj[_i] === "string") obj[_i] = "'"+obj[_i].toString()+"'";
if(typeof obj[_i] === "boolean") obj[_i] = obj[_i].toString() + " (boolean)";
response += _ws + _i + " : " + obj[_i].toString();
response += "\n";
continue;
}
response += (_f(_i)) ? _ws + _i + " : "+ _a +" (prevent loop)\n" : _ws + _i + " : " + _rf(obj[_i],n+_n,_n,_a);
}
if(_n != n) response += _ws;
return response +="} \n";
}
_res = _rf(_o,_m);
_dep = [];
return _res;
}
Uses Example:
var example = {ciao : "hellow", saluto : {ciao : "ciao", dam : true}};
example.parentObj = example;
console.log(OBJtoString(example,4));
return:
{
ciao : 'hellow'
saluto : {
ciao : 'ciao'
dam : true (boolean)
}
parentObj : FIRST PARENT OBJECT (prevent loop)
}
Other Example:
var example = {ciao : "hellow", saluto : {ciao : "ciao", dam : true}};
example.parentObj = example;
example.f = {
g : example
}
console.log(OBJtoString(example,4));
Return:
{
ciao : 'hellow'
saluto : {
ciao : 'ciao'
dam : true (boolean)
}
parentObj : FIRST PARENT OBJECT (prevent loop)
f : {
g : FIRST PARENT OBJECT (prevent loop)
}
}

I found util.inspect() pretty helpful.
You can print entire object
console.log(util.inspect(myObj))
Or with optional arguments
util.inspect(object, showHidden=false, depth=2, colorize=true)
Documentation:
https://nodejs.org/en/knowledge/getting-started/how-to-use-util-inspect/