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Given the declarations below, using the substr function, which ... | Filo

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(Check substrings) You can check whether a string is a substring of another string by using the f ind method in the str class. Write your own function to implement find. Write a program that prompts the user to enter two strings and then checks whether the first string is a substring of the second string. | Numerade

How do you check if one string contains a substring in JavaScript?