Generate ranges in javascript

ranges.js

const range1 = len => Object.keys(new Int8Array(len)).map(parseFloat);

const range2 = len => Array.apply(null, {length: len}).map(Number.call, Number);

const range3 = (start, end) => Array.apply(null, Array(end - start)).map((_, i) => start + i);

const range4 = (start, end) => [...Array(end - start)].map((_, i) => start + i);

const range5 = len => Object.keys(Array.apply(null, Array(len)));

const range6 = (start, end) => Array.from(Array(end - start), (_, i) => start + i);

@shvaikalesh's is most efficient, outside of possibly using a for loop.

@xgrommx looks like range4 and range6 are identical

@yairhaimo getting errors on range8 and range9 [ts] Supplied parameters do not match any signature of call target.