About 10 years ago I created a "text engine" for Java that I named StringTheory(tm).
I've lost the original Java code but I have a port to C#. I've always wanted a JS implementation though. This is a start on that.
What's it do?
StringTheory (ST) is basically a string library that revolves around a buffer that is changed in-place. ST is designed with a simple core that uses a Cut-Copy-Paste metaphor. Other operations in the library build on that core.
Here's an example from the test suite:
str = new ST("eat oats and does eat oats but little lambs eat ivy."); str.paste(0, "Mares "); // str => "Mares eat oats and does eat oats but little lambs eat ivy."); console.log(str.text);
This material is available under the MIT license. See license.txt in this repo.