• Formal Mechanised Semantics of CHERI C: Capabilities, Undefined Behaviour https://dl.acm.org/doi/10.1145/3617232.3624859?af=&ai=&ui= 18 comments 18/4/2024
• Goodbye “undefined is not a function” https://plus.google.com/+AddyOsmani/posts/DdWkiKsvbA2 65 comments 22/2/2015

• Jim Rogers http://undefined/#.tfta7wxlh3y;reddit 6 comments 12/6/2011 reddit.com
• reddt http://undefined 5 comments 5/5/2010 reddit.com
• TearDrop and Papillon Cakes Team Up to Offer Stylish Brides More Modern Wedding Options http://undefined 34 comments 27/3/2007 reddit.com
• Why `flycheck` warns me about undefined `cl-parse-integer` but code works? https://github.com/EmilySeville7cfg/personal-editor-configs/blob/main/Emacs/.emacs 5 comments 22/8/2022 emacs
• Why does accessing an element in an array with [] not give undefined as a possible type? https://www.typescriptlang.org/play#code/MYewdgzgLgBGCuBbARgUwE4QFxyW9A2gLowC8MxA3AFDWiSxhm4oYQEAMRNA9DzAJgA9APxA 14 comments 7/8/2022 typescript
• sveltekit endpoint request.headers.authorization undefined https://github.com/sveltejs/kit/pull/3384 2 comments 15/6/2022 sveltejs
• How to properly assign values to a dynamically constructed Object ? Typescript throws "Object is possibly undefined" https://www.typescriptlang.org/play#code/JYOwLgpgTgZghgYwgAgMIAsD2UAmBldOABxQG9lkAoCqTTMPMKUAcwC5kQBXAWwCNoAbmqc4PCBwDOTVsIpgAniQ4ByTCRArkAH2QqemAG5w+AGwgq5yGFAhgACpknAwwTCElSZIFlZitoR2dXd09kOBAFK2NmCLAAfg4IqMoAX0pKUEhYRBQASQJiCElkUhEAbQBrCAUObn5oAF0ODGx8QhJyxuF0rOh4JGQCjogAeT4AK1KRdQgQRKHCkkkrA2MzCAXhopW0jIRQsGQIAA8mRAYRgBUlYo4ACkkRsNbcJYgugEpkAF4APkWI3GUx+yEez2+-2mFAOHiOTx2wN+pVS4RK2xIwKsCOWADoYNgAKKIdD3cFFSEAsoUGGHZC0eiMZg+ZE4j4AIgZDG8LHZ3REtLhyEUJFZI1xIogVgobMkwPKksaYsRkwVtyV2l0pFS0uQAHo9XpZfLFVoALTIYEQBBHYAlIhOZxmBR6LggHAQfwgCA4FQC5DG1WK8pcpmsJWgwMTNUkRohujc5ksDW6Lq6qMxiBx0M8xq4ohcJ7kkifKypUsiWxgLhQEAB55YtKCIA 3 comments 25/5/2022 typescript
• Typescript says object is possibly 'undefined' for an object property, even after checking/narrowing if the property exists. https://www.typescriptlang.org/play#code/JYOwLgpgTgZghgYwgAgJIAVoGcD2JkDeAUMqclgNbAA21WA-AFyEllshwC2EzWYUoAOYBuVqQC+AbQC6otgAscAIyXAIDZsTbsuPcvyFyyU2UXFEiCPH2QAHbHmYYH+ALwsFy1euaSx2gmQObmYAclsoHEEoLk4hUORxABp-NkDgvVDBLnjElLZpM1FLazByCDgoBHlMKFw3ZAAKQLAAT3sk8srqxM1kNvtmCghWnBg0WvrOrAqq+V4DEEFEgEpkVwA+DzJgccaBlFcj5FDFFTUsULWtbVJdpvs6vEkD6WvU27sXF-aIaQA6GCgAAmjTOSla6y24Na-wy62OM268hWRlu5jY5nEwiAA 13 comments 10/2/2022 typescript
• Undefined behavior in C is a reading error. https://www.yodaiken.com/2021/05/19/undefined-behavior-in-c-is-a-reading-error/ 26 comments 20/5/2021 c_programming
• Does this code snippet lead to undefined behavior? https://www.reddit.com/r/cpp/comments/ja6xnq/does_this_code_snippet_lead_to_undefined_behavior/ 18 comments 13/10/2020 cpp
• rails aborted! NoMethodError: undefined method `split' for nil:NilClass https://www.reddit.com/r/rails/comments/iasufk/rails_aborted_nomethoderror_undefined_method/ 7 comments 16/8/2020 rails
• How to resolve Error: TypeError: Cannot read property 'forEach' of undefined? https://stackoverflow.com/questions/62721284/how-to-resolve-error-typeerror-cannot-read-property-foreach-of-undefined 3 comments 3/7/2020 node
• Handling null and undefined in JavaScript https://medium.com/javascript-scene/handling-null-and-undefined-in-javascript-1500c65d51ae 20 comments 12/1/2020 javascript
• Optional chaining helps to avoid "undefined is not a function" exceptions https://www.stefanjudis.com/today-i-learned/optional-chaining-helps-to-avoid-undefined-is-not-a-function-exceptions/ 45 comments 13/12/2019 javascript
• Russian opposition activist Alexei Navalny suffering from "undefined chemical substances" — not allergic reaction https://www.axios.com/alexei-navalny-vladimir-putin-allergic-reaction-bce8ccc8-753c-43d4-ac2b-4d677f4679c1.html 16 comments 28/7/2019 worldnews
• Iteration order on map is undefined, not random https://twitter.com/cafxx/status/1135190309514620928 24 comments 3/6/2019 golang
• Undefined function or variable problem in battle ships guessing game https://www.reddit.com/r/matlab/comments/b7mubh/undefined_function_or_variable_problem_in_battle/ 6 comments 31/3/2019 matlab
• Undefined method 'status' (class from another file) https://www.reddit.com/r/ruby/comments/ay031j/undefined_method_status_class_from_another_file/ 6 comments 6/3/2019 ruby
• Accessing Neptune in Lambda : Cannot read property 'reader' of undefined https://docs.aws.amazon.com/neptune/latest/userguide/access-graph-gremlin-node-js.html 3 comments 13/2/2019 aws
• The Undefined: A weekly motherforkin podcast about JavaScript hosted by Jared Palmer and Ken Wheeler https://theundefined.io 23 comments 25/11/2018 reactjs
• Adding a key/value pair to state makes my state variables values undefined ! https://repl.it/@aenkirch/MiniatureLeanOperatingsystem 12 comments 9/11/2018 reactjs
• Limits of undefined functions https://www.reddit.com/r/math/comments/9tbgcd/limits_of_undefined_functions/ 11 comments 1/11/2018 math
• CLang's UndefinedBehaviorSanitizer modifies C programs at compile time to catch various kinds of undefined behavior during program execution http://clang.llvm.org/docs/undefinedbehaviorsanitizer.html 9 comments 24/9/2018 programming
• null vs undefined https://codeburst.io/javascript-null-vs-undefined-20f955215a2 43 comments 13/1/2018 javascript
• Why is this variable undefined? https://www.reddit.com/r/learnprogramming/comments/6r9a31/why_is_this_variable_undefined/ 4 comments 3/8/2017 learnprogramming
• Undefined Behavior in 2017 https://blog.regehr.org/archives/1520 299 comments 5/7/2017 programming
• [rust] TIL 1 / 0 is infinity in Rust, instead of undefined https://doc.rust-lang.org/std/f64/constant.INFINITY.html 31 comments 26/6/2017 programmertil
• Do Expressive Programming Languages Always Have Undefined Behavior? http://blog.regehr.org/archives/1476 17 comments 7/3/2017 programming
• Kremlin critic in coma was 'poisoned by undefined substance' https://www.theguardian.com/world/2017/feb/07/kremlin-critic-in-coma-was-poisoned-by-undefined-substance 4 comments 7/2/2017 worldnews
• Portugal cab drivers block Lisbon airport in anti-Uber protest. The duration is still undefined. http://www.reuters.com/article/us-portugal-protests-uber-iduskcn12a1yx 74 comments 10/10/2016 europe
• A Differential Approach to Undefined Behavior Detection http://cacm.acm.org/magazines/2016/3/198849-a-differential-approach-to-undefined-behavior-detection/fulltext 9 comments 6/3/2016 programming
• Bumping an SO question - "Cannot call method 'toUpperCase' of undefined" in jest test of component http://stackoverflow.com/questions/32745129/cannot-call-method-touppercase-of-undefined-in-simple-react-jest-test 5 comments 15/12/2015 reactjs
• What Every C Programmer Should Know About Undefined Behavior (2011) http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html?repost! 100 comments 13/1/2014 programming
• Less Wrong identifies a common but previously undefined fallacy - "The noncentral fallacy" http://lesswrong.com/lw/e95/the_noncentral_fallacy_the_worst_argument_in_the/ 4 comments 1/10/2012 philosophy
• Contest: Craziest Compiler Output due to Undefined Behavior http://blog.regehr.org/archives/759 31 comments 12/7/2012 programming
• What is an indeterminate rule in C++ ? How is it different from an undefined rule? - Stack Overflow http://stackoverflow.com/q/11240484/267025 5 comments 6/7/2012 cpp
• "A-C-H-M-S-s-u is undefined": .Xmodmap to make Alt, Control, Hyper, Meta, Shift, Super available to Emacs. http://stackoverflow.com/a/10061777/16240 3 comments 8/4/2012 emacs
• What Every C Programmer Should Know About Undefined Behavior #2/3 http://blog.llvm.org/2011/05/what-every-c-programmer-should-know_14.html 70 comments 14/5/2011 programming
• A Guide to Undefined Behavior in C and C++ http://blog.regehr.org/archives/213 21 comments 18/8/2010 coding
• On Undefinable Numbers http://lshap.blogspot.com/2008/03/on-undefinable-numbers.html 23 comments 31/3/2008 math
• Undefined behavior in Perl and other languages http://blog.plover.com/prog/perl/undefined.html 25 comments 29/10/2007 programming

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