Meaning of “value is t”












1















When using describe-variable, often the value for a variable is listed as:



Its value is t



What does that mean and why specifically t?






help







share|improve this question





























    1















    When using describe-variable, often the value for a variable is listed as:



    Its value is t



    What does that mean and why specifically t?






    help







    share|improve this question



























      1












      1








      1








      When using describe-variable, often the value for a variable is listed as:



      Its value is t



      What does that mean and why specifically t?






      help







      share|improve this question
















      When using describe-variable, often the value for a variable is listed as:



      Its value is t



      What does that mean and why specifically t?






      help




      help






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 8 hours ago









      Drew

      48k463105




      48k463105










      asked 12 hours ago









      ChaimKutChaimKut

      1077




      1077






















          1 Answer
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          7














          To quote the Emacs Lisp Manual,




          t is the preferred way to represent the truth value true. When you
          need to choose a value that represents true, and there is no other
          basis for choosing, use t. The symbol t always has the value t.




          t stands for "True".



          This is important because it is used for decision making. It is used in decisions such as "If this condition is true, do this. Otherwise, do that." The statement Its value is t means that the variable you're describing holds the value t. The consequence of the variable being t depends on the variable.



          For example, 



          (setq inhibit-startup-message t)


          When the value of inhibit-startup-message is t, Emacs doesn't show the startup screen. To enable the startup screen, you would use a nil value. nil is the opposite of t and means "False".



          Generally speaking, the concepts of t and nil are part of what's called Boolean Algebra, a method of logic named after mathematician George Boole.



          Boolean Algebra is a topic important to computer programming, and many, many other fields of study. It's also quite fun and interesting. Unfortunately, it's too broad to explain in detail here.






          share|improve this answer

























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            1 Answer
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            active

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            1 Answer
            1






            active

            oldest

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            active

            oldest

            votes






            active

            oldest

            votes









            7














            To quote the Emacs Lisp Manual,




            t is the preferred way to represent the truth value true. When you
            need to choose a value that represents true, and there is no other
            basis for choosing, use t. The symbol t always has the value t.




            t stands for "True".



            This is important because it is used for decision making. It is used in decisions such as "If this condition is true, do this. Otherwise, do that." The statement Its value is t means that the variable you're describing holds the value t. The consequence of the variable being t depends on the variable.



            For example, 



            (setq inhibit-startup-message t)


            When the value of inhibit-startup-message is t, Emacs doesn't show the startup screen. To enable the startup screen, you would use a nil value. nil is the opposite of t and means "False".



            Generally speaking, the concepts of t and nil are part of what's called Boolean Algebra, a method of logic named after mathematician George Boole.



            Boolean Algebra is a topic important to computer programming, and many, many other fields of study. It's also quite fun and interesting. Unfortunately, it's too broad to explain in detail here.






            share|improve this answer






























              7














              To quote the Emacs Lisp Manual,




              t is the preferred way to represent the truth value true. When you
              need to choose a value that represents true, and there is no other
              basis for choosing, use t. The symbol t always has the value t.




              t stands for "True".



              This is important because it is used for decision making. It is used in decisions such as "If this condition is true, do this. Otherwise, do that." The statement Its value is t means that the variable you're describing holds the value t. The consequence of the variable being t depends on the variable.



              For example, 



              (setq inhibit-startup-message t)


              When the value of inhibit-startup-message is t, Emacs doesn't show the startup screen. To enable the startup screen, you would use a nil value. nil is the opposite of t and means "False".



              Generally speaking, the concepts of t and nil are part of what's called Boolean Algebra, a method of logic named after mathematician George Boole.



              Boolean Algebra is a topic important to computer programming, and many, many other fields of study. It's also quite fun and interesting. Unfortunately, it's too broad to explain in detail here.






              share|improve this answer




























                7












                7








                7







                To quote the Emacs Lisp Manual,




                t is the preferred way to represent the truth value true. When you
                need to choose a value that represents true, and there is no other
                basis for choosing, use t. The symbol t always has the value t.




                t stands for "True".



                This is important because it is used for decision making. It is used in decisions such as "If this condition is true, do this. Otherwise, do that." The statement Its value is t means that the variable you're describing holds the value t. The consequence of the variable being t depends on the variable.



                For example, 



                (setq inhibit-startup-message t)


                When the value of inhibit-startup-message is t, Emacs doesn't show the startup screen. To enable the startup screen, you would use a nil value. nil is the opposite of t and means "False".



                Generally speaking, the concepts of t and nil are part of what's called Boolean Algebra, a method of logic named after mathematician George Boole.



                Boolean Algebra is a topic important to computer programming, and many, many other fields of study. It's also quite fun and interesting. Unfortunately, it's too broad to explain in detail here.






                share|improve this answer















                To quote the Emacs Lisp Manual,




                t is the preferred way to represent the truth value true. When you
                need to choose a value that represents true, and there is no other
                basis for choosing, use t. The symbol t always has the value t.




                t stands for "True".



                This is important because it is used for decision making. It is used in decisions such as "If this condition is true, do this. Otherwise, do that." The statement Its value is t means that the variable you're describing holds the value t. The consequence of the variable being t depends on the variable.



                For example, 



                (setq inhibit-startup-message t)


                When the value of inhibit-startup-message is t, Emacs doesn't show the startup screen. To enable the startup screen, you would use a nil value. nil is the opposite of t and means "False".



                Generally speaking, the concepts of t and nil are part of what's called Boolean Algebra, a method of logic named after mathematician George Boole.



                Boolean Algebra is a topic important to computer programming, and many, many other fields of study. It's also quite fun and interesting. Unfortunately, it's too broad to explain in detail here.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 11 hours ago









                NickD

                2,6011515




                2,6011515










                answered 12 hours ago









                Lorem IpsumLorem Ipsum

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