difference between for of and for in statement

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Noelie
19 Feb 2019
1const arr = [3, 5, 7];
2arr.foo = 'hello';
3
4for (let i in arr) {
5   console.log(i); // logs "0", "1", "2", "foo"
6}
7
8for (let i of arr) {
9   console.log(i); // logs 3, 5, 7
10}
11
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