CircularBuffer for JavaScript and TypeScript

Ring / circular buffer examples:

• fixed capacity
• overwrite vs reject policies
• async producer–consumer

Topics

• 1-naive.js — naïve Array-based buffer (shift is O(n))
• 2-fixed.js — fixed ring buffer with head/tail indices
• 3-overwrite.js — drop oldest when full
• 4-reject.js — refuse writes when full
• 5-async.js — async put/take over a ring buffer