I’m having trouble to apply a reduce to an Object to get it in a querystring format. I want this: So far, the close I have got is this: which gives me: Is there an easier way to achieve this without have to prepend the initialValue and remove the & later? EDIT: This question is old and today we can
Tag: object
Nested Tree structure object trying to extract and get information Json object
I would like to know the correct way to create a nested Json tree Structure object in javascript. data structure containing objects and arrays. How can I extract the information, i.e. access a specific or multiple values (or id)? I have a very deep nested tree structure Json and I am given an object that can …
Modifying a copy of a JavaScript object is causing the original object to change
I am copying objA to objB same problem for Arrays Answer It is clear that you have some misconceptions of what the statement var tempMyObj = myObj; does. In JavaScript objects are passed and assigned by reference (more accurately the value of a reference), so tempMyObj and myObj are both references to the sam…
Concatenate Object values
I have a JavaScript Object and I’m sure the value of any key is an array (even empty in some case): Aside from using Underscore, is there any way to concatenate all the values of this Object (and create a new array)? At the moment I get the keys name using Object.keys, then I loop and concatenate. Any h…
Javascript – deepEqual Comparison
Question (From Eloquent Javascript 2nd Edition, Chapter 4, Exercise 4): Write a function, deepEqual, that takes two values and returns true only if they are the same value or are objects with the same properties whose values are also equal when compared with a recursive call to deepEqual. Test Cases: My code:…
Passing variables to object key function and back to requesting function
Seems like I can only create a global variable for this to work but here is what would be ideal. I would like to pass a variable to an object which has keys that reference functions. In the function I am referencing I would like to set either that variable or one that was defined within the function that call…
Sum similar keys in an array of objects
I have an array of objects like the following: I need to add up all the values for objects with the same name. (Probably also other mathematical operations like calculate average.) For the example above the result would be: Answer First iterate through the array and push the ‘name’ into another ob…
How to remove last key:value pair in JavaScript
I am very new to JavaScript and I am trying to figure out how to set a function to remove the last key:value pair to the right, much like array.pop for an array. This is an assignment I am working on. …
NodeJS: Would App Run Faster if Freeze Objects?
Most of my objects/functions do not change. Would the application run faster if I freeze most of the objects via Object.freeze(object)? Or will it make no difference at all? Answer Freezing (and sealing) causes a signficant performance hit instead of a gain across various browsers. Just take a look at some of…
Check if object value exists within a Javascript array of objects and if not add a new object to array
If I have the following array of objects: Is there a way to loop through the array to check whether a particular username value already exists and if it does do nothing, but if it doesn’t to add a new object to the array with said username (and new ID)? Thanks! Answer I’ve assumed that ids are mea…