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I just finished my website, which I started 2 years ago. I was always trying new things, which sometimes included adding different frameworks or other external JS files.
Now I don't know which of the linked files/lines of JS are unused. Is there a tool which can detect these files and lines of code? It would save me a lot of time.
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A simple solution is to use hashing. The idea is to traverse the given list and insert each encountered node into a set. If the current node already presents in the set (i.e., it is seen before), that means a cycle is present in the list.
Detecting a loop Step 1: First, we will initialize two pointers, i.e., S as a slow pointer and F as a fast pointer. Initially, both the pointers point to the first node in the linked list. Step 2: Move the 'S' pointer one node at a time while move the 'F' pointer two nodes at a time.
This answer offers Google's Closure Compiler which, in the process of minifying and concatenating your JavaScript code, can remove "dead code".
Quoting from the documentation for the compilation levels:
Compilation with ADVANCED_OPTIMIZATIONS removes code that is provably unreachable. This is especially useful in combination with large libraries. If you use only a few functions from a large library file, the compiler can remove everything except those functions from its output.
Also see this answer which contains more information on Google's Closure Compiler.
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I had this need so I created a tool that detects unused JS on the browser side, not just from the sources, so it can also test third parties scripts.
It works by creating a local proxy on your computer that intercepts JavaScript requests and instruments these files on-the-fly. The tool is than able to detect which parts of the instrumented files have been used by the page, and which don't.
I made it open-source and you can find it here: https://github.com/gmetais/unusedjs.
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