https://repl.it/NAgw/9

pipe.example.06.js

const pipe = (...fns ) => 
  fns.reduce( ( f, g ) => (...args ) => g( f(...args ) ) )

const add = ( before ) => [ before, ( x, y ) => x + y  ]

const id = ( x ) => x
const other = ( x, y ) => y
const square = ( x ) => x * x
const cube = ( x ) => x * x * x

const startFn = ( x, y ) => x + y
const fx1 = ( x ) => ( [ before = 0, op = startFn ] ) => op( before, id( x ) )
const fx2 = ( x ) => ( [ before = 0, op = startFn ] ) => op( before, square( x ) )
const fx3 = ( x ) => ( [ before = 0, op = startFn ] ) => op( before, cube( x ) )
const start = () => []

const result = ( x ) => 
  pipe(
    start,
    fx3( x ),
    add,
    fx2( x ),
    add,
    fx1( x )
  )()

console.log( result( 2 ) )