Why is using “for…in” for array iteration a bad idea?
The reason is that one construct: can sometimes be totally different from the other: Also consider that JavaScript libraries might do things like this, which will affect any array you create:
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Usage of the backtick character (`) in JavaScript
This is a feature called template literals. They were called “template strings” in prior editions of the ECMAScript 2015 specification. Template literals are supported by Firefox 34, Chrome 41, and Edge 12 and above, but not by Internet Explorer. Examples: http://tc39wiki.calculist.org/es6/template-strings/ Official specification: ECMAScript 2015 Language Specification, 12.2.9 Template Literal Lexical Components (a bit dry) Template literals can be used … Read more
How do I loop through or enumerate a JavaScript object?
You can use the for-in loop as shown by others. However, you also have to make sure that the key you get is an actual property of an object, and doesn’t come from the prototype. Here is the snippet: For-of with Object.keys() alternative: Notice the use of for-of instead of for-in, if not used it will return undefined on named … Read more
String.prototype.replaceAll() not working
There is no replaceAll in JavaScript: the error console was probably reporting an error. Instead, use the /g (“match globally”) modifier with a regular expression argument to replace:
Infinite Scrolling in Asp.Net MVC with jQuery / AJAX Issues
This is what I ended up doing based on the suggestion : Seems to work OK now thanks for that.
How to check if array is empty or does not exist?
You want to do the check for undefined first. If you do it the other way round, it will generate an error if the array is undefined. Update This answer is getting a fair amount of attention, so I’d like to point out that my original answer, more than anything else, addressed the wrong order of the … Read more
Add days to JavaScript Date
You can create one with:- This takes care of automatically incrementing the month if necessary. For example: 8/31 + 1 day will become 9/1. The problem with using setDate directly is that it’s a mutator and that sort of thing is best avoided. ECMA saw fit to treat Date as a mutable class rather than an immutable structure.
What is the most efficient way to deep clone an object in JavaScript?
Native deep cloning It’s called “structured cloning”, works experimentally in Node 11 and later, and hopefully will land in browsers. See this answer for more details. Fast cloning with data loss – JSON.parse/stringify If you do not use Dates, functions, undefined, Infinity, RegExps, Maps, Sets, Blobs, FileLists, ImageDatas, sparse Arrays, Typed Arrays or other complex types within your object, a … Read more
Remove duplicate values from JS array
Quick and dirty using jQuery:
Bootstrap Dropdown menu is not working
Maybe try with and see if it will work.