I have an array, that holds a large number of two-dimensional arrays: I need to convert this array into an object of the following form to send it as JSON: (“s_id” should be myArray[0][0], “t_id myArray[0][1], and “type” myArray[0][2] and so on.) How can I get the array in the de…
Tag: object
How to iterate over a JavaScript object?
I have an object in JavaScript: I want to use a for loop to get its properties. And I want to iterate it in parts (not all object properties at once). With a simple array I can do it with a standard for loop: But how to do it with objects? Answer For iterating on keys of Arrays, Strings, or
Reverse of JSON.stringify?
I’m stringyfing an object like {‘foo’: ‘bar’} How can I turn the string back to an object? Answer You need to JSON.parse() your valid JSON string.
Javascript “Not a Constructor” Exception while creating objects
I am defining an object like this: I then try to create an instance like this: but this exception is thrown: What could be wrong? I googled around a lot, but I still can’t figure out what I am doing wrong. Answer The code as posted in the question cannot generate that error, because Project is not a use…
Sort array of objects by single key with date value
I have an array of objects with several key value pairs, and I need to sort them based on ‘updated_at’: What’s the most efficient way to do so? Answer You can use Array.sort. Here’s an example:
Generic deep diff between two objects
I have two objects: oldObj and newObj. The data in oldObj was used to populate a form and newObj is the result of the user changing data in this form and submitting it. Both objects are deep, ie. they have properties that are objects or arrays of objects etc – they can be n levels deep, thus the diff al…
In javascript how can I dynamically get a nested property of an object
If I want ‘foo’ vs ‘bee’ I can just do arr[variable] – that’s easy, and the function does that. But what if I want to get arr.bar.baz AKA arr[bar][baz]? What can I pass to the getter function that will let me do that, (and of course also let me get non-nested properties usi…
Set of objects in javascript
I’d like to have a set of objects in Javascript. That is, a data structure that contains only unique objects. Normally using properties is recommended, e.g. myset[“key”] = true. However, I need the keys to be objects. I’ve read that Javascript casts property names to strings, so I gues…
Javascript: how to dynamically create nested objects using object names given by an array
I hope someone can help me with this Javascript. I have an Object called “Settings” and I would like to write a function that adds new settings to that object. The new setting’s name and value are provided as strings. The string giving the setting’s name is then split by the underscore…
Javascript event firing before action occurs
I am trying to write a script so that when I play an embedded sound object, a picture that I also have embedded will change. The problem is that when I load the page, the Javascript code automatically runs even though I don’t click play (autostart is set to false) on the sound object. Does anyone have a…