This post shows the notable difference between for..of VS for..in loop in TypeScript with an example.
Difference between for..of vs. for..in statements
Both for..of and for..in statements iterate over lists; the values iterated on are different though, for..in returns a list of keys on the object being iterated, whereas for..of returns a list of values of the numeric properties of the object being iterated.
Here is an example that demonstrates this distinction:
let list = [4, 5, 6];
for (let i in list) {
console.log(i); // "0", "1", "2",
}
for (let i of list) {
console.log(i); // "4", "5", "6"
}
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