Immutable array methods

immutable-arrays.js

const clone = x => [...x]
const push = y => [...x, y]
const pop = x = > x.slice(0, -1)
const unshift = y => x => [y, ...x]
const shift = x => x.slice(1)
const sort = f => x => [...x].sort(f)
const delete = i => x => [...x.slice(0, i), ...x.slice(i+1)]
const splice = (s, c, ...y) => x => [...x.slice(0, s), ...y, ...x.slice(s + c)]