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3bb13f0f update lbmref. Added info on set! git-subtree-dir: lispBM/lispBM git-subtree-split: 3bb13f0fe3661326054122f3e4390b422d2df036
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Benjamin Vedder
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doc/lbmref.md
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doc/lbmref.md
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# LispBM language reference
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* [LispBM language reference](#lispbm-language-reference)
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* [Arithmetic](#arithmetic)
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* [-](#-)
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* [*](#-1)
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* [/](#-2)
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* [mod](#mod)
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* [Comparisons](#comparisons)
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* [eq](#eq)
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* [=](#-3)
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* [>](#-4)
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* [<](#-5)
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* [Boolean operators](#boolean-operators)
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* [and](#and)
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* [or](#or)
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* [not](#not)
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* [Bit level operations](#bit-level-operations)
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* [shl](#shl)
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* [shr](#shr)
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* [bitwise-and](#bitwise-and)
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* [bitwise-or](#bitwise-or)
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* [bitwise-xor](#bitwise-xor)
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* [bitwise-not](#bitwise-not)
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* [Low level operations](#low-level-operations)
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* [encode-i32](#encode-i32)
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* [encode-u32](#encode-u32)
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* [encode-float](#encode-float)
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* [decode](#decode)
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* [nil and t](#nil-and-t)
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* [nil](#nil)
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* [t](#t)
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* [Quotes and Quasiquotation](#quotes-and-quasiquotation)
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* [quote](#quote)
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* [`](#-6)
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* [,](#-7)
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* [,@](#-8)
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* [Built-in operations](#built-in-operations)
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* [eval](#eval)
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* [eval-program](#eval-program)
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* [type-of](#type-of)
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* [sym-to-str](#sym-to-str)
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* [str-to-sym](#str-to-sym)
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* [sym-to-u](#sym-to-u)
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* [u-to-sym](#u-to-sym)
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* [is-fundamental](#is-fundamental)
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* [Special forms](#special-forms)
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* [if](#if)
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* [lambda](#lambda)
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* [closure](#closure)
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* [let](#let)
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* [define](#define)
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* [progn](#progn)
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* [read](#read)
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* [read-program](#read-program)
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* [Lists and cons cells](#lists-and-cons-cells)
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* [car](#car)
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* [cdr](#cdr)
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* [cons](#cons)
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* [.](#-9)
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* [list](#list)
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* [append](#append)
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* [ix](#ix)
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* [set-car](#set-car)
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* [set-cdr](#set-cdr)
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* [Arrays](#arrays)
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* [array-read](#array-read)
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* [array-write](#array-write)
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* [Pattern-matching](#pattern-matching)
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* [match](#match)
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* [_](#_)
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* [?](#-10)
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* [?i28](#i28)
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* [?u28](#u28)
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* [?float](#float)
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* [Concurrency](#concurrency)
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* [spawn](#spawn)
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* [wait](#wait)
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* [yield](#yield)
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* [Message-passing](#message-passing)
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* [send](#send)
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* [recv](#recv)
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* [Macros](#macros)
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* [macro](#macro)
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* [Call With Current Continuation](#call-with-current-continuation)
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* [Unparsable symbols](#unparsable-symbols)
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* [no_match](#no_match)
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* [read_error](#read_error)
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* [type_error](#type_error)
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* [eval_error](#eval_error)
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* [out_of_memory](#out_of_memory)
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* [fatal_error](#fatal_error)
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* [out_of_stack](#out_of_stack)
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* [division_by_zero](#division_by_zero)
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* [variable_not_bound](#variable_not_bound)
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* [Types](#types)
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* [type-list](#type-list)
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* [type-i28](#type-i28)
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* [type-u28](#type-u28)
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* [type-float](#type-float)
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* [type-i32](#type-i32)
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* [type-u32](#type-u32)
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* [type-array](#type-array)
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* [type-symbol](#type-symbol)
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* [type-char](#type-char)
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* [type-ref](#type-ref)
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* [type-stream](#type-stream)
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## Arithmetic
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### +
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@ -734,6 +627,42 @@ Example
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```clj
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(define apa 10)
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```
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---
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### set!
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The `set!` form is used to change the value of some variable in an environment.
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You can use `set!` to change the value of a global definition, a local definition
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or a variable defintion (`#var`). An application of the `set!` form looks like
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`(set! var-expr val-expr)` where `var-expr` should evaluate to a symbol. The `val-expr` is evaluated before
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rebinding the variable.
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Examples:
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```clj
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(define a 10)
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```
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The variable `a` is now `10` in the global environment.
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```clj
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(set! 'a 20)
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```
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Now, the value of `a` will be 20. Note that `a` is quoted in the `set!` form application
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while it is not in the `define` form. This is because `define` requires the first
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argument to be a symbol while the `set!` form requires the first argument to evaluate
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into a symbol.
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You can also set the value of a let bound variable.
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```clj
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(let ((a 10)) (set! 'a 20))
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```
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And you can change the value of a `#var`.
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```clj
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(define #a 10)
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(set '#a 20)
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```
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`#a` is now 20.
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---
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