Starfleet Academy: JavaScript concat Method Tutorial скачать в хорошем качестве

Starfleet Academy: JavaScript concat Method Tutorial

Welcome Cadet, to Starfleet Academy. The concat() method in JavaScript, a tool primarily used for merging multiple arrays or individual values into a single collection. A central theme is the concept of immutability, meaning the function produces a brand-new array rather than modifying the original data sources. To preserve the results of this operation, developers must assign the output to a new variable, as the original arrays remain untouched. The source also illustrates the technical syntax for combining various data types and compares this method to the modern spread operator. Finally, it highlights common beginner mistakes, specifically the "silent failure" that occurs when the returned value of a concatenation is not saved.