What is the output of the following JavaScript code?
var x = 10;
var y = 5;
console.log(x += y);
a)
10
b)
15
c)
5
d)
Error
Correct answer is option 'B'. Can you explain this answer?

Question

What is the output of the following JavaScript code?var x = 10;var y = 5;console.log(x += y);a)10b)15c)5d)ErrorCorrect answer is option 'B'. Can you explain this answer?

Answer

The += operator is used for addition and assignment. It adds the value of y to x and assigns the result back to x, resulting in x being 15.

Answer

Explanation:

The given JavaScript code assigns the value of variable `y` to variable `x` and then logs the value of `x` to the console.

Here is the step-by-step explanation of the code:

1. Variable `x` is declared and assigned a value of 10.
2. Variable `y` is declared and assigned a value of 5.
3. The assignment operator `=` is used to assign the value of `y` to `x`. This means that the value of `x` will be updated to 5.
4. The `console.log()` function is used to output the value of `x`, which is now 5, to the console.

Output:
The output of the code will be:
```
5
```

Explanation:
- The given code assigns the value of `y` to `x` using the assignment operator `=`.
- The assignment operator in JavaScript not only assigns the value but also returns the assigned value.
- Therefore, the expression `x = y` will evaluate to the value of `y`, which is 5.
- The `console.log()` function then outputs this value, 5, to the console.

Conclusion:
The output of the given JavaScript code is `5`.

Similar Software Development Doubts

What will be the output of the following JavaScript code?var x = 5;function updateX() { var x = 10;}updateX();console.log(x);

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