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Results tagged with javascript
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user 120556
JavaScript is a versatile, high-level programming language. It is the programming language in all browsers.and can be used for back-end programming with node.js. Use this tag for questions regarding vanilla JavaScript; optionally tagged with an ECMAScript version. If you are using a preprocessor such as TypeScript please tag with that too.
0
votes
Finding duplicates in an array of objects
JavaScript has many hash map options Map, Set, WeakMap, and WeakSet. In this case you can use a Map to index by user id. While adding to the map you can check the number of roles. …
- 22.3k
1
vote
Inserting Characters In Certain Positions Of A String
The title of the question infers that you are interested in the function insert at. However the body of your question implies you are focused on the transformation of a id string. I will review both.
…
- 22.3k
3
votes
Recursive Filter/Search function
Bugs
Your code will throw errors if you include null, or undefined in the data.
And your code does not check for cyclic data structures.
First some review points.
Review
Some general review points re …
- 22.3k
4
votes
Check if object contains only empty nested objects
Some issues?
typeof is not a function. eg typeof(input) === 'object' is written typeof input === 'object'
null is an Object so when you test for an object using typeof you MUST make sure it is not n …
- 22.3k
2
votes
Storing information in a bad way using localstorage?
Eg let saveInfo = [ should be const saveInfo = [
JavaScript uses undefined to mean "undefined". null is an object used as a place holder to mean "declared but not assigned". …
- 22.3k
7
votes
Accepted
Safely setting object properties with dot notation strings in JavaScript
Just reuse obj
Avoid the name set as it is used as a JavaScript token eg create a setter { set val(blah) {...} } Maybe the name could be assignToPath
null is also of type "object" so it will pay to extend …
- 22.3k
6
votes
Accepted
Calculate sum of values from checkboxes
Your code is too complex.
General points
Use textContent when setting text in an HTMLElement rather than innerHTML which forces a reflow.
Use a single listener rather than one for each clickable ele …
- 22.3k
4
votes
Accepted
Im trying to show the traffic lights in a loop
Is your question on topic?
Your code does not work as expected. However the rules for asking at code review states that code "...works correctly (to the best of your knowledge)" and timing bugs are ve …
- 22.3k
5
votes
Accepted
Using Chained Array Functions to Generate A '-' Separated Random Alpha-Numeric Code
Functions
Programmers are lazy. So much so that most of what makes a modern language is all about doing more with less effort.
The important concept to understand is the use of functions.
Functions l …
- 22.3k
2
votes
Accurate countdown timer
You ask
"What am I supposed to do to handle the countdown and keep it counting correctly in case this happens without stopping the timer?"
Ignore the fact that the interval was longer than expected …
- 22.3k
3
votes
JavaScript Drag & Drop Sortable List
General coding points
The type property in the script tag defaults to type="text/javascript" and is not required. …
- 22.3k
3
votes
JavaScript coding style for initializing variables
As you are not using ; consistently I would say that your init style is dangerous as it will block automatic colon insertion.
For example the following lines will throw a syntax error SyntaxError: Un …
- 22.3k
3
votes
Accepted
Listener for property value changes in a Javascript object
Serious BUG!
Normally this would make the question "off topic", but unless you are experienced with JS this type of bug is very often overlooked or even considered in normal testing regimes.
The bug i …
- 22.3k
2
votes
Smart and Inututive Auto-Format Date Input
Unsafe input modification
There are way too many issues with this function for it to be safe to use in the wild.
The main reason is when a client modifies the data (change an entered date). Your funct …
- 22.3k
3
votes
Accepted
Pascal Triangle implementation in javascript
Minor style points and an alternative solution.
With these types of problems the first port of call is always Wikipedia to get as much info as you can before you start on creating a solution.
Two th …
- 22.3k