How many bytes in a family emoji?

f2.js

let family = '👨‍👨‍👧‍👧'

let codePoints = [...family]
// [ '👨', '‍', '👩', '‍', '👧', '‍', '👦' ]

let bytes = codePoints.map(cp => [...Buffer.from(cp)])
// [ [ 240, 159, 145, 168 ],
//   [ 226, 128, 141 ],
//   [ 240, 159, 145, 169 ],
//   [ 226, 128, 141 ],
//   [ 240, 159, 145, 167 ],
//   [ 226, 128, 141 ],
//   [ 240, 159, 145, 166 ] ]

family_emoji.js

let pipe = (...fns) => init => fns.reduce((val, fn) => fn(val), init)

let bytes = str => [...Buffer.from(str)]
let len = arr => arr.length
let nBytes = pipe(bytes, len)

let add = (a, b) => a + b

console.log(
  [... '👨‍👨‍👧‍👧'].map(nBytes).reduce(add, 0)
)