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< title > – Wren< / title >
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< h1 > < a href = "./" > wren< / a > < / h1 >
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< h2 > a classy little scripting language< / h2 >
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< / div >
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< a href = "./" > < img src = "./wren.svg" class = "logo" > < / a >
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< ul >
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< li > < a href = "getting-started.html" > Getting Started< / a > < / li >
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< li > < a href = "contributing.html" > Contributing< / a > < / li >
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< li > < a href = "blog" > Blog< / a > < / li >
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< h2 > guides< / h2 >
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< li > < a href = "syntax.html" > Syntax< / a > < / li >
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< li > < a href = "method-calls.html" > Method Calls< / a > < / li >
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< li > < a href = "variables.html" > Variables< / a > < / li >
< li > < a href = "functions.html" > Functions< / a > < / li >
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< li > < a href = "concurrency.html" > Concurrency< / a > < / li >
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< h2 > reference< / h2 >
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< li > < a href = "modules" > Modules< / a > < / li >
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< li > < a href = "embedding" > Embedding< / a > < / li >
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< li > < a href = "performance.html" > Performance< / a > < / li >
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< div > < a href = "getting-started.html" > Getting Started< / a > < / div >
< div > < a href = "contributing.html" > Contributing< / a > < / div >
< div > < a href = "blog" > Blog< / a > < / div >
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< tr >
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< td colspan = "2" > < h2 > guides< / h2 > < / td >
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< td > < h2 > reference< / h2 > < / td >
< / tr >
< tr >
< td >
< ul >
< li > < a href = "syntax.html" > Syntax< / a > < / li >
< li > < a href = "values.html" > Values< / a > < / li >
< li > < a href = "lists.html" > Lists< / a > < / li >
< li > < a href = "maps.html" > Maps< / a > < / li >
< li > < a href = "method-calls.html" > Method Calls< / a > < / li >
< li > < a href = "control-flow.html" > Control Flow< / a > < / li >
< / ul >
< / td >
< td >
< ul >
< li > < a href = "variables.html" > Variables< / a > < / li >
< li > < a href = "functions.html" > Functions< / a > < / li >
< li > < a href = "classes.html" > Classes< / a > < / li >
< li > < a href = "concurrency.html" > Concurrency< / a > < / li >
< li > < a href = "error-handling.html" > Error Handling< / a > < / li >
< li > < a href = "modularity.html" > Modularity< / a > < / li >
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< li > < a href = "modules" > Modules< / a > < / li >
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< li > < a href = "embedding" > Embedding< / a > < / li >
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< li > < a href = "performance.html" > Performance< / a > < / li >
< li > < a href = "qa.html" > Q & A< / a > < / li >
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< main >
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< h2 > < / h2 >
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< h2 > Wren is a small, fast, class-based concurrent scripting language < a href = "#wren-is-a-small,-fast,-class-based-concurrent-scripting-language" name = "wren-is-a-small,-fast,-class-based-concurrent-scripting-language" class = "header-anchor" > #< / a > < / h2 >
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< hr / >
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< p > Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in
a familiar, modern < a href = "syntax.html" > syntax< / a > . < / p >
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< div class = "codehilite" > < pre > < span class = "vg" > System< / span > < span class = "o" > .< / span > < span class = "n" > print< / span > < span class = "p" > (< / span > < span class = "s" > " Hello, world!" < / span > < span class = "p" > )< / span >
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< span class = "k" > class< / span > < span class = "vg" > Wren< / span > < span class = "p" > {< / span >
< span class = "n" > flyTo< / span > < span class = "p" > (< / span > < span class = "n" > city< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "vg" > System< / span > < span class = "o" > .< / span > < span class = "n" > print< / span > < span class = "p" > (< / span > < span class = "s" > " Flying to < / span > < span class = "si" > %(< / span > < span class = "n" > city< / span > < span class = "si" > )< / span > < span class = "s" > " < / span > < span class = "p" > )< / span >
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< span class = "p" > }< / span >
< span class = "p" > }< / span >
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< span class = "k" > var< / span > < span class = "n" > adjectives< / span > < span class = "o" > =< / span > < span class = "vg" > Fiber< / span > < span class = "o" > .< / span > < span class = "n" > new< / span > < span class = "p" > {< / span >
< span class = "p" > [< / span > < span class = "s" > " small" < / span > < span class = "p" > ,< / span > < span class = "s" > " clean" < / span > < span class = "p" > ,< / span > < span class = "s" > " fast" < / span > < span class = "p" > ]< / span > < span class = "o" > .< / span > < span class = "n" > each< / span > < span class = "p" > {< / span > < span class = "o" > |< / span > < span class = "n" > word< / span > < span class = "o" > |< / span > < span class = "vg" > Fiber< / span > < span class = "o" > .< / span > < span class = "n" > yield< / span > < span class = "p" > (< / span > < span class = "n" > word< / span > < span class = "p" > )< / span > < span class = "p" > }< / span >
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< span class = "p" > }< / span >
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< span class = "k" > while< / span > < span class = "p" > (< / span > < span class = "o" > !< / span > < span class = "n" > adjectives< / span > < span class = "o" > .< / span > < span class = "n" > isDone< / span > < span class = "p" > )< / span > < span class = "vg" > System< / span > < span class = "o" > .< / span > < span class = "n" > print< / span > < span class = "p" > (< / span > < span class = "n" > adjectives< / span > < span class = "o" > .< / span > < span class = "n" > call< / span > < span class = "p" > ())< / span >
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< / pre > < / div >
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< ul >
< li >
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< p > < strong > Wren is small.< / strong > The VM implementation is under < a href = "https://github.com/wren-lang/wren/tree/master/src" > 4,000 semicolons< / a > .
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You can skim the whole thing in an afternoon. It’ s < em > small< / em > , but not
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< em > dense< / em > . It is readable and < a href = "https://github.com/wren-lang/wren/blob/46c1ba92492e9257aba6418403161072d640cb29/src/wren_value.h#L378-L433" > lovingly-commented< / a > . < / p >
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< / li >
< li >
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< p > < strong > Wren is fast.< / strong > A fast single-pass compiler to tight bytecode, and a
compact object representation help Wren < a href = "performance.html" > compete with other dynamic
languages< / a > . < / p >
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< / li >
< li >
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< p > < strong > Wren is class-based.< / strong > There are lots of scripting languages out there,
but many have unusual or non-existent object models. Wren places
< a href = "classes.html" > classes< / a > front and center. < / p >
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< / li >
< li >
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< p > < strong > Wren is concurrent.< / strong > Lightweight < a href = "concurrency.html" > fibers< / a > are core to the execution
model and let you organize your program into an army of communicating
coroutines. < / p >
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< / li >
< li >
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< p > < strong > Wren is a scripting language.< / strong > Wren is intended for embedding in
applications. It has no dependencies, a small standard library,
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and < a href = "embedding" > an easy-to-use C API< / a > . It compiles cleanly as C99, C++98
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or anything later. < / p >
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< / li >
< / ul >
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< hr / >
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< p > If you like the sound of this, < a href = "getting-started.html" > let’ s get started< / a > . You can even try
it < a href = "http://ppvk.github.io/wren-nest/" > in your browser< / a > ! Excited? Well, come on and < a href = "contributing.html" > get
involved< / a > ! < / p >
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< / main >
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< / div >
< footer >
< div class = "page" >
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< div class = "main-column" >
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< p > Wren lives
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< a href = "https://github.com/wren-lang/wren" > on GitHub< / a >
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— Made with ❤ by
< a href = "http://journal.stuffwithstuff.com/" > Bob Nystrom< / a > and
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< a href = "https://github.com/wren-lang/wren/blob/master/AUTHORS" > friends< / a > .
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< / p >
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