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In Javascript, we have numerous ways to check if something is or is not a number. This is a particularly common task in Javascript, where there is dynamic typing, resulting in some unexpected things being classified as numbers. Typescript fixes some ...

Javascript arrays can contain duplicates - which is fine most of the time, but can sometimes cause some issues. For example, if an array is supposed to only contain unique user IDs, but is taken from a data source which may contain duplicates: let us...

a String is a type of data in Javascript, and as with any other type of data, Strings have prototypes and therefore inherit standard methods. One of these methods is toLowerCase(), which you'll often see written as String.prototype.toLowercase(). Thi...
