Angular - orderBy string as number - javascript

Im using youtube json api and it returns the viewcount as a string, but i need to sort it as an number. How could i do this without going thru the whole model and converting strings to ints?
json snippet
yt$hd: Object
yt$statistics: Object
favoriteCount: "0"
viewCount: "1443"
__proto__: Object
and im invoiking sorting like
orderBy:'yt$statistics.viewCount'


Not that firmilar with Angular, but I'd assume that orderBy parameter can take a function in place of a string like Lo-Dash does with its `sortBy() function. In which case you'd probably want something like this:
orderBy: function(obj){
return ~~obj.yt$statistics.viewCount
}

Related

Prevent JSON.parse from rearanging an object

In my web application I receive a JSON string from the server which I keep in the greetings variable:
var greetings = '{"2":"hoi","3":"hi","1":"salam"}'
Please notice how the greetings start with the index 2 and the value hoi.
Now I want to parse the JSON and the result is the following:
JSON.parse(greetings) // {1: "salam", 2: "hoi", 3: "hi"}
The order has changed, it seems like JSON.parse orders the result by key.
Is there a way to keep the order of the original string intact?

{
"2":"hoi",
"3":"hi",
"1":"salam"
}
is not an array, its an object. Objects don't have any order.
If the order is important, you need to switch to an actual array.

You generally cannot rely on the order of indices in an object. Use an array of key/value pairs instead.
As you can see the keys are parsed to (numeric) indices, which is why they are ordered that way. You could hack around this by prefixing your keys and then stripping those later:
console.log(JSON.parse('{"i2":"hoi","i3":"hi","i1":"salam"}'))

Cant convert JSON to array in Angular.js

Hi everyone I have some problems with angular, I made a request in $http so i have a JSON like:
{"y":"1","a":"0"}
and I want to convert it to an array like
{y:1, a:0}
I'd already tried whit angular.fromJson(myData) but it doesnt works
Hope you´ll help me because Im a begginer

This is just a hint/suggestion, something you might overlooked. It is hard to understand your question, clarify if this is not what you are looking for.
Maybe for some reason you got "{"y":"1","a":"0"}" back, which is a string.
If you need to get a JSON object from it then use JSON.parse(string) function.

Use this method is used to convert json string response to an array, object, number
var temp = [];
temp = angular.fromJson(json);
console.log(temp);
This function will convert and return
https://docs.angularjs.org/api/ng/function/angular.fromJson

The only difference between the object that you have after parsing the JSON and the object that you want is that the string values need to be number values.
Loop though the keys and convert the values:
for (key in obj) obj[key] = parseInt(obj[key], 10);

Compare ObjectIDs for greater/smaller in JavaScript

I am aware you can query MongoDB for an object ID using the $gt and $lt operators. However, I would like to know how to compare two object IDs in this way but in plain JavaScript — not through a query.
I'm aware the ObjectID object has an equals method, but obviously that isn't what I need to test for greater/smaller than. I couldn't convert them to a timestamp and do the comparison that way because of the structure of ObjectIDs (with the incrementing counter at the end).

Convert the ObjectID objects to strings so that you can compare them:
if (oid1.toString() > oid2.toString()) { ... }
Or let JavaScript do the string conversions for you and just compare them directly:
if (oid1 > oid2) { ... }

Converting an array to a string in Javascript

I have a multi-dimensional array like this:
1 2 3
4 5 6
Now I need to convert this array into a string like 1,2,3;4,5,6.
Can any one suggest how to do this, please?

simply use the join method on the array.
> [[1,2,3],[4,5,6]].join(';')
'1,2,3;4,5,6'
It's lucky that you simply don't have to consider how the apply the join method on the inner lists, because a list is joined by comma by default. when a list is coerced into a string, it by default uses commas to separate the items.

As it was already mentioned by qiao, join() is not recursive.
But if you handle the recursion yourself you should acquire the desired result, although in a rather inelegant way.
var array = [[1,2,3],[5,6,7]];
var result = [];
array.forEach(
function(el){
result.push(
el.join(",")
);
});
result.join(";");

If you need to serialize an array into a string and then deserialize it later to get an array from the string you might want to take a look at JSON:
http://www.openjs.com/scripts/data/json_encode.php
Try this:
array.toString();
See here for reference: http://www.w3schools.com/jsref/jsref_tostring_array.asp
See answer by qiao for a much nicer approach to multidimensional arrays like this.

Javascript Counting Array of Objects

I am been having trouble counting the number of objects in this array in server-side javascript.
Below is a JSON object which was parsed out using the array that I am trying to count.
NOTE: The object is in object form, not JSON string form.
JSON Object:
[{"dataSymbol":"21135103","isHoliday":false,"isIPO":false,"lastTradeTime":40073.49652777778,"strikePrice":"33.00","last":"1.30","change":"0.20","changePct":"18.1818","lastRaw":1.3,"ask":"1.40","bid":"1.30","lastTime":40073.49652777778,"tick":0,"openInterest":"13.6K","volume":"80311","expDate":40194,"coName":"AJR Jan0 33.0 C"},
{"dataSymbol":"21339645","isHoliday":false,"isIPO":false,"lastTradeTime":40073.50479166866,"strikePrice":"6.00","last":"2.11","change":"0.01","changePct":"0.4762","lastRaw":2.11,"ask":"2.15","bid":"2.10","lastTime":40073.50479166866,"tick":0,"openInterest":"105.00","volume":"62313","expDate":40285,"coName":"EK Apr0 6.0 C"},
{"dataSymbol":"13511861","isHoliday":false,"isIPO":false,"lastTradeTime":40073.489583333336,"strikePrice":"113.00","last":"1.41","change":"-6.34","changePct":"-81.8065","lastRaw":1.41,"ask":"7.60","bid":"7.45","lastTime":40073.489583333336,"tick":0,"openInterest":"805.00","volume":"62975","expDate":40138,"coName":"SPY Nov8 113.0 P"},
{"dataSymbol":"20718334","isHoliday":false,"isIPO":false,"lastTradeTime":40073.49375,"strikePrice":"40.00","last":"1.42","change":"-0.05","changePct":"-3.4014","lastRaw":1.42,"ask":"1.46","bid":"1.44","lastTime":40073.49375,"tick":0,"openInterest":"116.1K","volume":"60470","expDate":40194,"coName":"QQQQ Jan0 40.0 P"},
{"dataSymbol":"20348966","isHoliday":false,"isIPO":false,"lastTradeTime":40073.47708333333,"strikePrice":"41.00","last":"2.39","change":"-0.06","changePct":"-2.449","lastRaw":2.39,"ask":"2.45","bid":"2.42","lastTime":40073.47708333333,"tick":-1,"openInterest":"4.6K","volume":"60320","expDate":40257,"coName":"QQQQ Mar0 41.0 P"}]
I usually use myObject.length to count this type of array, but that is not working.
Response.Write(optionsQuotes.length);
The above code is returning a result of 21339646 as the count, when the actual count of the array is 5.
I would rather not have to loop through the array to count it, because I am looping through it later in order to draw a table, and I need to know the last iteration before the table draw begins.
Any ideas?
EDIT:
//here is where I am gettnig the array of objects...
var myObj = common.getMyObj("param1", "param2");
I serialized the object for the purpose of showing the contents of the array.
myObj.constructor is an Array.
This is on the server side also BTW.

ECMAScript doesn't handle the length of "assocative" arrays like PHP does - either use a real list that has a .length property, set the .length property manually in the JSON as you populate properties in the object, or do a for..in loop and make sure to use .hasOwnProperty and increment some counter.

Mhh... maybe is not a JSON object but an string and the length that is returning is the length of the string and not of the json array
With prototype you need to do something like
var data = '{ "name": "Violet", "occupation": "character" }'.evalJSON();
data.length
but this obviously is depending of the framework that you are using.

The bug must be somewhere else as the following
<script>
var foo = eval('[{"dataSymbol":"21135103","isHoliday":false,"isIPO":false,"lastTradeTime":40073.49652777778,"strikePrice":"33.00","last":"1.30","change":"0.20","changePct":"18.1818","lastRaw":1.3,"ask":"1.40","bid":"1.30","lastTime":40073.49652777778,"tick":0,"openInterest":"13.6K","volume":"80311","expDate":40194,"coName":"AJR Jan0 33.0 C"},{"dataSymbol":"21339645","isHoliday":false,"isIPO":false,"lastTradeTime":40073.50479166866,"strikePrice":"6.00","last":"2.11","change":"0.01","changePct":"0.4762","lastRaw":2.11,"ask":"2.15","bid":"2.10","lastTime":40073.50479166866,"tick":0,"openInterest":"105.00","volume":"62313","expDate":40285,"coName":"EK Apr0 6.0 C"},{"dataSymbol":"13511861","isHoliday":false,"isIPO":false,"lastTradeTime":40073.489583333336,"strikePrice":"113.00","last":"1.41","change":"-6.34","changePct":"-81.8065","lastRaw":1.41,"ask":"7.60","bid":"7.45","lastTime":40073.489583333336,"tick":0,"openInterest":"805.00","volume":"62975","expDate":40138,"coName":"SPY Nov8 113.0 P"},{"dataSymbol":"20718334","isHoliday":false,"isIPO":false,"lastTradeTime":40073.49375,"strikePrice":"40.00","last":"1.42","change":"-0.05","changePct":"-3.4014","lastRaw":1.42,"ask":"1.46","bid":"1.44","lastTime":40073.49375,"tick":0,"openInterest":"116.1K","volume":"60470","expDate":40194,"coName":"QQQQ Jan0 40.0 P"},{"dataSymbol":"20348966","isHoliday":false,"isIPO":false,"lastTradeTime":40073.47708333333,"strikePrice":"41.00","last":"2.39","change":"-0.06","changePct":"-2.449","lastRaw":2.39,"ask":"2.45","bid":"2.42","lastTime":40073.47708333333,"tick":-1,"openInterest":"4.6K","volume":"60320","expDate":40257,"coName":"QQQQ Mar0 41.0 P"}]');
document.writeln(foo.length);
</script>
yields the correct value.

I think you need to eval the string. Could 21339645 be the number of characters?

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