javascript check number against undefined

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Thais
11 Oct 2020
1let id;
2
3if(typeof id === 'undefined') {
4    console.log("id is undefined...");
5}
Deedee
30 Jan 2020
1
2function divisors(integer) {
3    let  i, flag = true; 
4       let arr=[];       
5           
6            
7            for(i = 2; i <= integer - 1; i++) {
8                if (integer % i == 0) { 
9                    flag = false; 
10                     arr.push(i)
11                } 
12            }
13            if (flag == true) 
14              console.log(integer + " is prime"); 
15            else
16                console.log(arr)
17}
18console.log(divisors(15))
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