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What will be the output of the following code?
let obj = { a: 1, b: 2, c: 3 };
for (let value of obj) {
console.log(value);
}
let obj = { a: 1, b: 2, c: 3 };
for (let value of obj) {
console.log(value);
}
- a)a b c
- b)1 2 3
- c)undefined undefined undefined
- d)The output cannot be determined
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
What will be the output of the following code?let obj = { a: 1, b: 2, ...
The for...of loop cannot be used to iterate over an object directly. It can only iterate over iterable objects like arrays or strings.
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Community Answer
What will be the output of the following code?let obj = { a: 1, b: 2, ...
Explanation:
The code snippet is trying to iterate over the values of an object using a for...of loop. However, this will not work because objects are not iterable in JavaScript.
Objects are not iterable:
In JavaScript, objects are not iterable by default. Iterables are objects that implement the iterable protocol, which means they define a method called `Symbol.iterator`. This method is used by language constructs such as `for...of` loops to iterate over the values of the object.
The `for...of` loop can only be used with objects that are iterable, such as arrays, strings, and sets. When you try to use it with an object that is not iterable, it will throw a TypeError.
Solution:
If you want to iterate over the values of an object, you can use a `for...in` loop instead. This loop iterates over the keys of an object, and you can use the keys to access the corresponding values.
Here's an example of how you can modify the code to achieve the desired result:
```
let obj = { a: 1, b: 2, c: 3 };
for (let key in obj) {
console.log(obj[key]);
}
```
This will output the values of the object: `1 2 3`.
The code snippet is trying to iterate over the values of an object using a for...of loop. However, this will not work because objects are not iterable in JavaScript.
Objects are not iterable:
In JavaScript, objects are not iterable by default. Iterables are objects that implement the iterable protocol, which means they define a method called `Symbol.iterator`. This method is used by language constructs such as `for...of` loops to iterate over the values of the object.
The `for...of` loop can only be used with objects that are iterable, such as arrays, strings, and sets. When you try to use it with an object that is not iterable, it will throw a TypeError.
Solution:
If you want to iterate over the values of an object, you can use a `for...in` loop instead. This loop iterates over the keys of an object, and you can use the keys to access the corresponding values.
Here's an example of how you can modify the code to achieve the desired result:
```
let obj = { a: 1, b: 2, c: 3 };
for (let key in obj) {
console.log(obj[key]);
}
```
This will output the values of the object: `1 2 3`.
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