Check if String contains given Substring | JavaScript Basics to Advance
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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