javascript create array from for loop

Question

I have a years range stored into two variables. I want to create an array of the years in the range.

something like:

var yearStart = 2000;
var yearEnd = 2040;
var arr = [];
for (var i = yearStart; i < yearEnd; i++) {
 var obj = {
 ... 
 };
 arr.push(obj);
}

What should I put inside the obj ?

The array I'd like to generate would be like:

arr = [2000, 2001, 2003, ... 2039, 2040]

• shivgre: I posted an answer which gives both highest number as well as all values if highest number is greater then your certain number

Answer 1

even shorter if you can lose the yearStart value:

var yearStart = 2000;
var yearEnd = 2040;
var arr = [];
while(yearStart < yearEnd+1){
 arr.push(yearStart++);
}

UPDATE: If you can use the ES6 syntax you can do it the way proposed here:

let yearStart = 2000;
let yearEnd = 2040;
let years = Array(yearEnd-yearStart+1)
 .fill()
 .map(() => yearStart++);

Answer 2

You need to push i

var yearStart = 2000;
var yearEnd = 2040;
var arr = [];
for (var i = yearStart; i < yearEnd+1; i++) {
 arr.push(i);
}

Then, your resulting array will be:

arr = [2000, 2001, 2003, ... 2039, 2040]

Hope this helps

Answer 3

var yearStart = 2000;
var yearEnd = 2040;
var arr = [];
for (var i = yearStart; i <= yearEnd; i++) {
 arr.push(i);
}

Answer 4

Remove obj and just do this inside your for loop:

arr.push(i);

Also, the i < yearEnd condition will not include the final year, so change it to i <= yearEnd.

Answer 5

If you like generators, then this might be a more elegant approach:

function* range(start, stop) {
 for (let i = start; i < stop; i++) yield i;
}
const years = range(2000, 2040).toArray();
console.log(years);