The file function_composer.js is for automatic function composition (AFC) in javascript. AFC is composing new functions from a list of function signatures, and a given target input type set and output type

It is well commented, and is hopefully very obvious

See findFunctions at the bottom of the file, primarily, to see how it works

Example usage:

const sigs = [
  {name: 'times2', output: 'O', inputs: ['Y'], func:(x)=>x*2},
  {name: 'add1', output: 'Y', inputs: ['X'], func:(x)=>x+1}
]
const fns = [...findFunctions(sigs, [{name:'x', type:'X'}], 'O', {})]
assertEquals(fns.length, 1)
assertEquals(fns[0](4), 10)