I have an object that looks like this: I have lodash installed in my application for other things. Is there an efficient way to use lodash to delete the entry: {“subTopicId”:2, “number”:32} from the obj object? Or is there a javascript way to do this? Answer As lyyons pointed out in th…
Tag: arrays
Inserting MySQL results from PHP into JavaScript Array
I’m trying to make a very simple autocomplete function on a private website using a trie in JavaScript. Problem is the examples I have seen and trying are just using a predefined list in a JavaScript array. e.g. var arrayObjects = [“Dog”,”Cat”,”House”,”MouseR…
Javascript: Finding the most middle value in an array [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Questions asking for code must demonstrate a minimal understanding of the problem being solved. Include attempted solutions, why they didn’t work, and the expected results. See also: Stack Overflow ques…
Loop to remove an element in array with multiple occurrences
I want to remove an element in an array with multiple occurrences with a function. This loop doesn’t remove the element when it repeats twice in sequence, only removes one of them. Why? Answer You have a built in function called filter that filters an array based on a predicate (a condition). It doesn&#…
How to get a number of random elements from an array?
I am working on ‘how to access elements randomly from an array in javascript’. I found many links regarding this. Like: Get random item from JavaScript array But in this, we can choose only one item from the array. If we want more than one elements then how can we achieve this? How can we get more…
Sum JavaScript object propertyA values with the same object propertyB in an array of objects
How would one take a JavaScript array of objects, such as and merge duplicate keys by summing the values? In order to get something like this: I have tried iterating and adding to a new array, but this didn’t work: Answer You should be assigning each object not found to the result with its .key property…
JavaScript: use defineProperty accessor on an array’s .length?
I would like (mainly for academic reasons) to be able to set an accessor on an array’s length using Object.defineProperty(), so than I can notify for size changes. I am aware of ES6 object observe, and watch.js, but I would like to attempt to do this in ES5 without extra libraries if possible, even if t…
Resize ArrayBuffer
If I want to create an arraybuffer, I write: var buff = new ArrayBuffer(size) But how is it possible to resize an existing buffer? I mean, adding some more bytes at the end of the buffer. Answer I’ve done it in C++ like this. Just made a bigger array and copy the contents over and then return the larger…
Convert an array to a list using jQuery
Got a challenge to convert a two dimensional array to a html list. the array is like The structure of the nested array item is id, textOfLink, parent. parent 0 means top level, parent 3 means the item is under another list item with id of 3. the target output will a list in html like please note the array
What is the concept of Array.map?
I am having problems understanding the concept of Array.map. I did go to Mozilla and Tutorials Point, but they provided very limited info regarding this. This is how I am using Array.map. It is a little complex (a bit of d3.js involved; just ignore it) I do not understand exactly what this code is doing. I kn…