I'm completely new to javascript and recently encountered an issue where I needed an array containing numbers from 1 to 20.
To achieve this, I used the following code:
var numberArray = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];
QUERY:
I can't help but wonder if this method is not the most efficient (and definitely not scalable). Is there a way to automatically generate an array with sequential values ranging between 1 and 20, or even up to 1000?
Check out this simple code:
let myArray = Array(20).join().split(',').map(function(a){return this.i++},{i:1});
Alternatively, a slightly shorter version:
let myArray = ('' + Array(20)).split(',').map(function(){return this[0]++;}, [1]);
Both techniques involve creating an empty Array with 20 undefined elements. The map method is not applicable directly to such an array, so the trick with join and split converts it into a usable format. Each iteration of the map callback increments the initial value (either {i:1} or [1]) for each element, resulting in myArray containing values from 1 to 20.
Additional Method using ES20xx:
[...Array(21).keys()].slice(1);
For more information on Array.map, refer to this resource
Explore a live example on StackBlitz.
1 Why does map not work directly? Find answers in these Stack Overflow posts: Explanation 1 and Explanation 2
If you're looking for a straightforward solution, consider using a basic loop like this:
var numbers = [];
for(var i = 1; i <= 20; i++){
numbers.push(i);
}
console.log(numbers);
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