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In [[computer programming]], '''self-modifying code''' is code that modifies itself. This is straightforward to write when using [[assembly language]] and is also supported by some high level language interpreters such as [[SNOBOL4]] or the [[Lisp programming language]]. It is more difficult to implement on compilers but compilers such as [[Clipper programming language|Clipper]] and [[Spitbol]] make a fair attempt at it. Batch programming scripts often involve self modifying code as well. Use of self-modifying code is not recommended where alternatives exist. This is because such code can be difficult to understand and maintain.
Self-modifying code was used in the early days of computers in order to save memory space in computers with very small main memory sizes.
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