Question

How to create a range of numbers in Node.js

Answer 1

const n = 10;
 
let rng = [...Array(n).keys()];
 
console.log(rng);
 
 
 
/*
run:
    
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
    
*/

 

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Answer 2

function range(start, end) {
    if (start === end) return [start];
     
    if (start > end) {
        throw Error(`"Error: start (${start}) >= end (${end})"`);
    }
     
    return [start, ...range(start + 1, end)];
}
 
let rng = range(2, 8);
 
console.log(rng);
 
 
 
/*
run:
    
[2, 3, 4, 5, 6, 7, 8]
    
*/

 

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