How can I very simply convert an number into an array without doing a for loop?
Something like this:
var days = 30;
var days = days.toArray(); // Output - [1, 2, 3, 4, 5, 6, 7, 8, 9, ...]
What I currently do is following:
var days = 30;
var days = 30;
var array = [];
for(var i = 1;i <= 30;i++) {
array.push(i);
}
console.log(array);
Array.from()has an optional parametermapFn, which allows you to execute amapfunction on each element of the array (or subclass object) that is being created. More clearly,Array.from(obj, mapFn, thisArg)has the same result asArray.from(obj).map(mapFn, thisArg), except that it does not create an intermediate array.
Try Array.from() by passing an object with length property as the first parameter and map function as the second parameter:
var days = 30;
var days = Array.from({length: days}, (v, i) => i+1);
console.log(days)
var array = [...Array(30]
i+1, to let your answer exactly the same as asker desired result :D
You can use spread syntax.
Reference Document: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax
array = [...Array(30).keys()]
console.log(array);
rangemethod stand for. Now I do though. I was searching like so on SO and google:convert number to arrayandconvert number to array without loop.