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Among other techniques, coalescing is used to reduce [[Fragmentation (computer)|external fragmentation]], but is not totally effective. Coalescing can be done as soon as blocks are freed, or it can be deferred until some time later (known as deferred coalescing), or it might not be done at all.
Coalescence and related techniques like heap compaction, can be used in [[Garbage collection (computer science)|garbage collection]].<ref>{{cite web |last1=Megida |first1=Dillion |title=What is the Nullish Coalescing Operator in JavaScript, and how is it useful |url=https://www.freecodecamp.org/news/what-is-the-nullish-coalescing-operator-in-javascript-and-how-is-it-useful/ |website=Freecodecamp}}</ref>
== See also ==
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