# Proper Tail Call

David Herman

Proper Tail Call (PTC) allows recursive calls without flooding the memory usage with garbage.

The current limit of recursive calls is around 10k in Chrome and 49k in FireFox. (Aug 2015)

ES6 brings proper tail calls.

• Tail position equals the last instruction to fire before the return statement.
• Tail call equals calling another function from the tail position.
• Close call equals when the last instruction has to return to the method to do something. eg. return 1 + bar()

It only works on Strict Mode.