Add 1 to each element using .map

Question

I have an array created and I would like to know how to use the.map function to add 1 to each element of the array

 function range(n){ let arr= [...Array(n).keys()]; }

Answer 1

JS arrays are zero index based, so keys will return values starting from zero, you need to manually add the 1 so either add .map(i=> i+1) after arr, or you can simply use Array.from instead,

 function range(n) { let arr = Array.from({ length: n }, (_, i) => i + 1) return arr } console.log(range(9))