javascript undefined
if (typeof myVariable === 'undefined'){
//myVariable is undefined
}if(myVar === null) {
console.log("Element is undefined");
}var x;
if (typeof x === 'undefined') {
// these statements execute
}//detecting undefined object property
if (typeof person.last_name === "undefined") {
console.log("person last_name is undefined");
}
//detecting undefined variable
if (typeof myVar === "undefined") {
console.log("myVar is undefined");
}function divisors(integer) {
let i, flag = true;
let arr=[];
for(i = 2; i <= integer - 1; i++) {
if (integer % i == 0) {
flag = false;
arr.push(i)
}
}
if (flag == true)
console.log(integer + " is prime");
else
console.log(arr)
}
console.log(divisors(15))
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