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vi (pronounced as distinct letters, / ˌ v iː ˈ aɪ / ⓘ) [1] is a screen-oriented text editor originally created for the Unix operating system. The portable subset of the behavior of vi and programs based on it, and the ex editor language supported within these programs, is described by (and thus standardized by) the Single Unix Specification and POSIX.
Vim (/ v ɪ m / ⓘ; [5] vi improved) is a free and open-source, screen-based text editor program. It is an improved clone of Bill Joy's vi.Vim's author, Bram Moolenaar, derived Vim from a port of the Stevie editor for Amiga [6] and released a version to the public in 1991.
Most basically, applications use code folding to outline source code, collapsing each block to a single line. This can be only top-level blocks like functions and classes, nested blocks like nested functions and methods, or all blocks, notably control-flow blocks. This allows one to get an overview of code, easily navigating and rearranging it ...
Elvis was the pioneering vi clone, widely admired in the 1990s for its conciseness, and many features. [2] [3] It influenced the development of Vim until about 1997.[4] [5]It was the first to provide color syntax highlighting (and to generalize syntax highlighting to multiple file types), first to provide highlighted selections via keyboard.
A block is a grouping of code that is treated collectively. Many block syntaxes can consist of any number of items (statements, expressions or other units of code) – including one or zero. Languages delimit a block in a variety of ways – some via marking text and others by relative formatting such as levels of indentation.
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Many languages allow generic copying by one or either strategy, defining either one copy operation or separate shallow copy and deep copy operations. [1] Note that even shallower is to use a reference to the existing object A, in which case there is no new object, only a new reference. The terminology of shallow copy and deep copy dates to ...
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