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Features introduced by I
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'''I''' is an experimental language by [[Marshall Lochbaum]], based on the concept of extending the implicit mapping used by array languages to all datatypes including functions. Lochbaum has described the language as "not usable" and stated that he tried to avoid the constraining nature of I's design decisions in his later language [[BQN]].<ref>[[Marshall Lochbaum]]. [https://mlochbaum.github.io/BQN/commentary/history.html "BQN's development history"].</ref> | '''I''' is an experimental language by [[Marshall Lochbaum]], based on the concept of extending the implicit mapping used by array languages to all datatypes including functions. Lochbaum has described the language as "not usable" and stated that he tried to avoid the constraining nature of I's design decisions in his later language [[BQN]].<ref>[[Marshall Lochbaum]]. [https://mlochbaum.github.io/BQN/commentary/history.html "BQN's development history"].</ref> New I features that later appeared in other languages (not always by direct influence) include the 2-[[train]] meaning [[Atop]], [[Hook]] operators, the ambivalent [[Pair]] function, and the [[Constant]] operator. | ||
Like [[K]], the language uses nested lists rather than arrays in order to simplify the design. Although a related paper defines mapping over [[Dictionary|associative arrays]], references, and sets, as of 2021 the I implementation only supports lists and functions as datatypes. I uses a left-to-right syntax that allows whitespace to indicate [[precedence]] in addition to parentheses. Every value can be called as a function, and every function takes two arguments, with the function <code>.</code> used to call functions of one argument. Primitive functions are written with single ASCII characters, while identifiers are surrounded with single quotes. I has no function definition syntax; instead functions must be defined using [[tacit programming]]. As a result there is only a single global scope for variables. | Like [[K]], the language uses nested lists rather than arrays in order to simplify the design. Although a related paper defines mapping over [[Dictionary|associative arrays]], references, and sets, as of 2021 the I implementation only supports lists and functions as datatypes. I uses a left-to-right syntax that allows whitespace to indicate [[precedence]] in addition to parentheses. Every value can be called as a function, and every function takes two arguments, with the function <code>.</code> used to call functions of one argument. Primitive functions are written with single ASCII characters, while identifiers are surrounded with single quotes. I has no function definition syntax; instead functions must be defined using [[tacit programming]]. As a result there is only a single global scope for variables. | ||