define: DUK_USE_MARK_AND_SWEEP
introduced: 1.0.0
removed: 2.0.0
default: true
tags:
  - gc
  - memory
description: >
  Enable mark-and-sweep garbage collection (recommended).

  When disabled, only reference counting is used for garbage collection.
  This reduces code footprint and eliminates garbage collection pauses, but
  objects participating in unreachable reference cycles won't be collected
  until the Duktape heap is destroyed.  In particular, function instances
  won't be collected because they're always in a reference cycle with their
  default prototype object.  Unreachable objects are collected if you break
  reference cycles manually (and are always freed when a heap is destroyed).

  NOTE: Removed in Duktape 2.0.0 because mark-and-sweep is no longer optional.