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Explanation

Function Declaration:

The function containsSubstring is declared with two parameters: mainStr (the main string to search within) and subStr (the substring to search for).

Input Validation:

The function first checks if both mainStr and subStr are valid strings using the typeof operator.

If either mainStr or subStr is not a string, the function returns false.

Using includes Method:

The includes method is used to check if subStr is found within mainStr.

mainStr.includes(subStr) returns true if subStr is found within mainStr, and false otherwise.

Return Result:

The function returns the result of mainStr.includes(subStr).

Example Usage:

containsSubstring(“Hello, world!”, “world”) returns true because “world” is a substring of “Hello, world!”.
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