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[1]: 94 These rules may be applied by the type system to determine if a program is well-typed and what type expressions have. A prototypical example of the use of typing rules is in defining type inference in the simply typed lambda calculus, which is the internal language of Cartesian closed categories. [2]
The process of verifying and enforcing the constraints of types—type checking—may occur at compile time (a static check) or at run-time (a dynamic check). If a language specification requires its typing rules strongly, more or less allowing only those automatic type conversions that do not lose information, one can refer to the process as strongly typed; if not, as weakly typed.
Person typing on a laptop keyboard Video of typing on a notebook computer keyboard. Typing is the process of writing or inputting text by pressing keys on a typewriter, computer keyboard, mobile phone, or calculator. It can be distinguished from other means of text input, such as handwriting and speech recognition. Text can be in the form of ...
Smalltalk, Ruby, Python, and Self are all "strongly typed" in the sense that typing errors are prevented at runtime and they do little implicit type conversion, but these languages make no use of static type checking: the compiler does not check or enforce type constraint rules. The term duck typing is now used to describe the dynamic typing ...
Sentence spacing concerns how spaces are inserted between sentences in typeset text and is a matter of typographical convention. [1] Since the introduction of movable-type printing in Europe, various sentence spacing conventions have been used in languages with a Latin alphabet. [2]
The amendment 1 of ISO/IEC 9995-2:2009, which was published in 2012, specifies two ways of the emulation of a numeric keypad within the alphanumeric section of a keyboard. One way, with mappings to keys in the left half of the alphanumeric section (shown green in the diagram above), emulates a numeric keypad with the digits 1,2,3 in the upper row.
In type theory, a typing environment (or typing context) represents the association between variable names and data types. More formally, an environment Γ {\displaystyle \Gamma } is a set or ordered list of pairs x , τ {\displaystyle \langle x,\tau \rangle } , usually written as x : τ {\displaystyle x:\tau } , where x {\displaystyle x} is a ...
Competitive typist Albert Tangora demonstrating his typing in 1938. Touch typing (also called blind typing, or touch keyboarding) is a style of typing.Although the phrase refers to typing without using the sense of sight to find the keys—specifically, a touch typist will know their location on the keyboard through muscle memory—the term is often used to refer to a specific form of touch ...