in and of in javascript code example
Example 1: for in and for of in js
Object.prototype.objCustom = function () {};
Array.prototype.arrCustom = function () {};
let iterable = [3, 5, 7];
iterable.foo = "hello";
for (let i in iterable) {
console.log(i); // logs 0, 1, 2, "foo", "arrCustom", "objCustom"
}
for (let i of iterable) {
console.log(i); // logs 3, 5, 7
}
Example 2: for in and for of in js
const iterable = [10, 20, 30];
for (const value of iterable) {
console.log("fef"+value);
}
// 10
// 20
// 30