Redundant code

<p>In <a href="/facts/Computer_programming/QmSsFnu0">computer programming</a>, redundant code is <a href="/facts/Source_code/o9J6Jv23">source code</a> or compiled code in a <a href="/facts/Computer_program/e38jH9N9">computer program</a> that is unnecessary, such as:
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<ul><li>recomputing a value that has previously been calculated and is still available,</li>
<li>code that is never executed (known as <a href="/facts/Unreachable_code/BNas1LeK">unreachable code</a>),</li>
<li>code which is executed but has no external effect (e.g., does not change the output produced by a program; known as <a href="/facts/Dead_code/LUzfCIzw">dead code</a>).</li></ul>
<p>A <a href="/facts/NOP_(code)/uGcGefyG">NOP</a> instruction might be considered to be redundant code that has been explicitly inserted to pad out the <a href="/facts/Instruction_(computer_science)/8p8vwUeE">instruction</a> stream or introduce a time delay, for example to create a timing loop by "wasting time".  <a href="/facts/Identifier/pPaQPLhj">Identifiers</a> that are declared, but never referenced, are termed redundant declarations.
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Redundant code open-in-new

Redundant code