What will be the output of the following JavaScript code snippet?
var txt1 = "Sanfoundry_";var txt2 = "Javascriptmcq";document.getElementById("demo").innerHTML = txt1 + txt2;a)errorb)Sanfoundry_ Javascriptmcqc)undefinedd)Sanfoundry_JavascriptmcqCorrect answer is option 'D'. Can you explain this answer?

Question

What will be the output of the following JavaScript code snippet?

var txt1 = "Sanfoundry_";var txt2 = "Javascriptmcq";document.getElementById("demo").innerHTML = txt1 + txt2;a)errorb)Sanfoundry_ Javascriptmcqc)undefinedd)Sanfoundry_JavascriptmcqCorrect answer is option 'D'. Can you explain this answer?

Answer

```javascript
const arr = [1, 2, 3, 4, 5];
const newArr = arr.splice(2, 1, 6, 7);
console.log(newArr);
console.log(arr);
```

Output:

```
[3]
[1, 2, 6, 7, 4, 5]
```

Explanation:

The `splice()` method is used to change the contents of an array by removing or replacing existing elements and/or adding new elements. In this code snippet, the `splice()` method is called on the `arr` array with the arguments `2` (the starting index), `1` (the number of elements to remove), `6` and `7` (the elements to add).

The `newArr` variable is assigned the value of the removed element(s), which in this case is `3` (the element at index `2`).

The first `console.log()` statement prints the value of `newArr`, which is `[3]`.

The second `console.log()` statement prints the value of `arr`, which has been modified by the `splice()` method. The elements at index `2` and `3` have been replaced with `6` and `7`, respectively. The resulting array is `[1, 2, 6, 7, 4, 5]`.

Answer

The + operator in javascript acts as a concatenation operator when used with string. The new string does not have any space between the two added strings.

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