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forIn.html
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forIn.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>For In</title>
</head>
<body>
</body>
<script>
let array = [10, 20, 30];
for (let value in array) {
console.log(value);
}
// for (let value in array) {
// console.log(array[value]);
// }
// for (let value of array) {
// console.log(value); // 10, 20, 30
// }
const str = "mickey";
for (const char of str) {
console.log(char); //
}
// const map = new Map([["a", 1], ["b", 2]]);
// for (const [key, value] of map) {
// console.log(`${key}: ${value}`); // 'a: 1', 'b: 2'
// }
// for (const key of map) {
// console.log(key);
// }
// for (const value of map) {
// console.log(map);
// }
// const set = new Set([1, 2, 3, 7, 8]);
// for (const value of set) {
// console.log(value);
// }
// const obj = { a: 1, b: 2, c: 3 };
// for (const key in obj) {
// console.log(`${key}: ${obj[key]}`); // 'a: 1', 'b: 2', 'c: 3'
// }
</script>
</html>