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"id": "https://mathstodon.xyz/users/xameer/statuses/110876525009302164",
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"summary": "I am not fully convinced here , maybe lazy eval is a cult",
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"published": "2023-08-12T11:58:27Z",
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"content": "<p>In a lazy evaluation scheme, the evaluation of an expression is deferred until the<br />value of the expression is actually needed elsewhere in the computation. That<br />is, the expression is evaluated on demand. This contrasts with what is called<br />eager evaluation in which an expression is evaluated as soon as its inputs are<br />available.<br />For example, if eager evaluation is used, an argument (which may be an arbi-<br />trary expression) of a function call is evaluated before the body of the function.<br />If lazy evaluation is used, the argument is not evaluated until the value is actu-<br />ally needed during the evaluation of the function body. If an argument’s value<br />is never needed, then the argument is expression is never evaluated.<br />Why should we care? Well, this facility allows programmers to construct and<br />use data structures that are conceptually unbounded or infinite in size. As<br />long as a program never actually needs to inspect the entire structure, then a<br />terminating computation is still possible.<br />For example, we might define the list of natural numbers as a list beginning<br />with 0, followed by the list formed by adding one to each element of the list of<br />natural numbers.<br />Lazy evaluation thus allows programmers to separate the data from the control.<br />They can define a data structure without having to worry about how it is<br />processed and they can define functions that manipulate the data structure<br />without having to worry about its size or how it is created. This ability to<br />separate the data from the control of processing enables programs to be highly<br />modular<br /><a href=\"https://mathstodon.xyz/tags/haskell\" class=\"mention hashtag\" rel=\"tag\">#<span>haskell</span></a><br /><a href=\"https://john.cs.olemiss.edu/~hcc/csci450/notes/haskell_notes.pdf\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">john.cs.olemiss.edu/~hcc/csci4</span><span class=\"invisible\">50/notes/haskell_notes.pdf</span></a></p>",
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"en": "<p>In a lazy evaluation scheme, the evaluation of an expression is deferred until the<br />value of the expression is actually needed elsewhere in the computation. That<br />is, the expression is evaluated on demand. This contrasts with what is called<br />eager evaluation in which an expression is evaluated as soon as its inputs are<br />available.<br />For example, if eager evaluation is used, an argument (which may be an arbi-<br />trary expression) of a function call is evaluated before the body of the function.<br />If lazy evaluation is used, the argument is not evaluated until the value is actu-<br />ally needed during the evaluation of the function body. If an argument’s value<br />is never needed, then the argument is expression is never evaluated.<br />Why should we care? Well, this facility allows programmers to construct and<br />use data structures that are conceptually unbounded or infinite in size. As<br />long as a program never actually needs to inspect the entire structure, then a<br />terminating computation is still possible.<br />For example, we might define the list of natural numbers as a list beginning<br />with 0, followed by the list formed by adding one to each element of the list of<br />natural numbers.<br />Lazy evaluation thus allows programmers to separate the data from the control.<br />They can define a data structure without having to worry about how it is<br />processed and they can define functions that manipulate the data structure<br />without having to worry about its size or how it is created. This ability to<br />separate the data from the control of processing enables programs to be highly<br />modular<br /><a href=\"https://mathstodon.xyz/tags/haskell\" class=\"mention hashtag\" rel=\"tag\">#<span>haskell</span></a><br /><a href=\"https://john.cs.olemiss.edu/~hcc/csci450/notes/haskell_notes.pdf\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">john.cs.olemiss.edu/~hcc/csci4</span><span class=\"invisible\">50/notes/haskell_notes.pdf</span></a></p>"
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