Generate an array in a particular range

generate_range.js

const start = 5;
const end = 20;
let myArray = Array.from(new Array(end - start)).map((_, index) => start + index);
console.log(myArray); // -> 5,6,7,8,9,10,11,12,13,14,15,16,17,18,19
//alernative
myArray = [...(new Array(end - start))].map((_, index) => start + index);
console.log(myArray); // -> 5,6,7,8,9,10,11,12,13,14,15,16,17,18,19
//alternative: arrayFrom takes optional map function parameter to avoid intermediate creation
myArray = Array.from(new Array(end - start),((_, index) => start + index)); // -> 5,6,7,8,9,10,11,12,13,14,15,16,17,18,19

function range(start=0, stop=0, step = 1) {
    if (!stop) {
        stop = start || 0;
        start = 0;
    }

    var length = Math.max(Math.ceil((stop - start) / step), 0)
    return Array.from({length}, (x, i) => (i * step) + start);
}