Helpers for creating class like functions that can be invoked without new

create-class-like-functions.js

const assoc = ( prop, value, obj ) => 
  Object.assign( {}, obj, { [prop]: value })

const reducer = ( $values, accumulate, [key,val] ) => assoc( key, val.bind( undefined, ...$values ), accumulate )

export const bindValuesToMethods = ( $methods, ...$values ) => 
  Object.entries( $methods ).reduce( reducer.bind( undefined, ...$values ), {} )

export const prepareInstance = (instanceMethods, staticMethods = ({}) ) => Object.assign(
  bindValuesToMethods.bind( undefined, instanceMethods ),
  staticMethods
)

New name suggestions for "prepareInstance" welcomed!

export const bindValuesToMethods = ( $methods, ...$values ) => 
  Object.entries( $methods ).reduce( reducer.bind( undefined, ...$values ), {} )

should be

export const bindValuesToMethods = ($methods, ...$values) =>
  Object.entries($methods).reduce(reducer.bind(undefined, $values), {})

else error will happed