immutable array examples
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const clone = x => [...x] | |
const push = y => x => [...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)] | |
const unique = arr => [...new Set(arr)] | |
const {0:first, length:l, [l - 1]:last} = [1,2,3,4,5] |
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usage: