Store the minimum and maximum range in an object:

var a = {
    from: 0,
    to: 100
};

Numbers

[...Array(5).keys()];
 => [0, 1, 2, 3, 4]

Character iteration

String.fromCharCode(...[...Array('D'.charCodeAt(0) - 'A'.charCodeAt(0) + 1).keys()].map(i => i + 'A'.charCodeAt(0)));
 => "ABCD"

Iteration

for (const x of Array(5).keys()) {
  console.log(x, String.fromCharCode('A'.charCodeAt(0) + x));
}
 => 0,"A" 1,"B" 2,"C" 3,"D" 4,"E"

As functions

function range(size, startAt = 0) {
    return [...Array(size).keys()].map(i => i + startAt);
}

function characterRange(startChar, endChar) {
    return String.fromCharCode(...range(endChar.charCodeAt(0) -
            startChar.charCodeAt(0), startChar.charCodeAt(0)))
}

As typed functions

function range(size:number, startAt:number = 0):ReadonlyArray<number> {
    return [...Array(size).keys()].map(i => i + startAt);
}

function characterRange(startChar:string, endChar:string):ReadonlyArray<string> {
    return String.fromCharCode(...range(endChar.charCodeAt(0) -
            startChar.charCodeAt(0), startChar.charCodeAt(0)))
}

lodash.js _.range() function

_.range(10);
 => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
_.range(1, 11);
 => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
_.range(0, 30, 5);
 => [0, 5, 10, 15, 20, 25]
_.range(0, -10, -1);
 => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
String.fromCharCode(..._.range('A'.charCodeAt(0), 'D'.charCodeAt(0) + 1));
 => "ABCD"

Old non es6 browsers without a library:

Array.apply(null, Array(5)).map(function (_, i) {return i;});
 => [0, 1, 2, 3, 4]

console.log([...Array(5).keys()]);

(ES6 credit to nils petersohn and other commenters)

How to increment from 1 to 100

for(var i =1;i<=100;i++){
  console.log(i);
}

How to decrement from 100 to 1

for(var i =100;i>=1;i--){
  console.log(i);
}

Only the last 50 lines are shown in the console in Stack Overflow

Any previous output lines scroll off the top and are lost. So although the output may look incomplete, they were indeed all logged in the console.

You can efficiently achieve the result using a single loop.

For demo purposes, I've printed up to 20. You can add any number of your choice.

let lastTotal = 0;
let lastStr = "";

for (let i = 1; i <= 10; ++i) {
  const total = (lastTotal ?? 0) + i;
  const str = lastStr ? lastStr + " + " + i : i;
  console.log(`Iteration ${i}: ${str}${total === 1 ? "" : " = " + total}`);
  lastTotal = total;
  lastStr = str;
}

/* This is not a part of answer. It is just to give the output fill height. So IGNORE IT */
.as-console-wrapper { max-height: 100% !important; top: 0; }