range function for JavaScript. range is a function that's central to Python that I've implemented in JS. Here, it's a generator just like how it is in Python. Works with negative number arguments.

rangeForJavascript.js

function* range(start, stop, step=1) {
    if(typeof stop === 'undefined') [start, stop] = [0, start]
    for(let i = start; step > 0 ? i < stop : i > stop; i += step)
        yield i
}

/*
[...range(0, 10, 2)]
[0, 2, 4, 6, 8]

[...range(2, 2)]
[]

[...range(3, -1, -1)]
[3, 2, 1, 0]

for(let i of range(10))
    console.log(i)
*/