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authorJoel Kronqvist <joel.h.kronqvist@gmail.com>2022-03-05 19:02:27 +0200
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+# 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
+const genfun = require('generate-function')
+const { d } = genfun.formats
+
+function addNumber (val) {
+ const gen = genfun()
+
+ gen(`
+ function add (n) {')
+ return n + ${d(val)}) // supports format strings to insert values
+ }
+ `)
+
+ return gen.toFunction() // will compile the function
+}
+
+const add2 = addNumber(2)
+
+console.log('1 + 2 =', add2(1))
+console.log(add2.toString()) // prints the generated function
+```
+
+If you need to close over variables in your generated function pass them to `toFunction(scope)`
+
+``` js
+function multiply (a, b) {
+ return a * b
+}
+
+function addAndMultiplyNumber (val) {
+ const gen = genfun()
+
+ gen(`
+ function (n) {
+ if (typeof n !== 'number') {
+ throw new Error('argument should be a number')
+ }
+ const result = multiply(${d(val)}, n + ${d(val)})
+ return result
+ }
+ `)
+
+ // use gen.toString() if you want to see the generated source
+
+ return gen.toFunction({multiply})
+}
+
+const addAndMultiply2 = addAndMultiplyNumber(2)
+
+console.log(addAndMultiply2.toString())
+console.log('(3 + 2) * 2 =', addAndMultiply2(3))
+```
+
+You can call `gen(src)` as many times as you want to append more source code to the function.
+
+## Variables
+
+If you need a unique safe identifier for the scope of the generated function call `str = gen.sym('friendlyName')`.
+These are safe to use for variable names etc.
+
+## Object properties
+
+If you need to access an object property use the `str = gen.property('objectName', 'propertyName')`.
+
+This returns `'objectName.propertyName'` if `propertyName` is safe to use as a variable. Otherwise
+it returns `objectName[propertyNameAsString]`.
+
+If you only pass `gen.property('propertyName')` it will only return the `propertyName` part safely
+
+## License
+
+MIT