X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs-website;a=blobdiff_plain;f=node_modules%2Fgenerate-function%2FREADME.md;fp=node_modules%2Fgenerate-function%2FREADME.md;h=693bff87cfe9008536b005d032ba100e99fde12b;hp=0000000000000000000000000000000000000000;hb=a2bd1bf0c2c1f1a17d188f4dc0726a45494cefae;hpb=57c063afa3f66b07c4bbddc2d6129a96d90f0aad diff --git a/node_modules/generate-function/README.md b/node_modules/generate-function/README.md new file mode 100644 index 000000000..693bff87c --- /dev/null +++ b/node_modules/generate-function/README.md @@ -0,0 +1,72 @@ +# generate-function + +Module that helps you write generated functions in Node + +``` +npm install generate-function +``` + +[![build status](http://img.shields.io/travis/mafintosh/generate-function.svg?style=flat)](http://travis-ci.org/mafintosh/generate-function) + +## Disclamer + +Writing code that generates code is hard. +You should only use this if you really, really, really need this for performance reasons (like schema validators / parsers etc). + +## Usage + +``` js +var genfun = require('generate-function') + +var addNumber = function(val) { + var fn = genfun() + ('function add(n) {') + ('return n + %d', val) // supports format strings to insert values + ('}') + + return fn.toFunction() // will compile the function +} + +var add2 = addNumber(2) + +console.log('1+2=', add2(1)) +console.log(add2.toString()) // prints the generated function +``` + +If you need to close over variables in your generated function pass them to `toFunction(scope)` + +``` js +var multiply = function(a, b) { + return a * b +} + +var addAndMultiplyNumber = function(val) { + var fn = genfun() + ('function(n) {') + ('if (typeof n !== "number") {') // ending a line with { will indent the source + ('throw new Error("argument should be a number")') + ('}') + ('var result = multiply(%d, n+%d)', val, val) + ('return result') + ('}') + + // use fn.toString() if you want to see the generated source + + return fn.toFunction({ + multiply: multiply + }) +} + +var addAndMultiply2 = addAndMultiplyNumber(2) + +console.log('(3 + 2) * 2 =', addAndMultiply2(3)) +``` + +## Related + +See [generate-object-property](https://github.com/mafintosh/generate-object-property) if you need to safely generate code that +can be used to reference an object property + +## License + +MIT \ No newline at end of file