str . indexOf(pattern) searches the string str for pattern , which can be either

Question

str.indexOf(pattern) searches the string str for pattern, which can be either a character or a string. The search starts at the beginning of the string. The method returns the first index at which pattern occurs, or -1 if it is not found before the end of the string.

The second form of the method indexOf allows you to start the search at a given index.

str.indexOf(pattern, k) searches the string str for pattern, starting at index k and searching through the rest of the string till the end. If the pattern is found, it returns the index where it is first found, or -1 if it is not found before the end of the string.

1.

String str = "hello, world";

      str.length() returns _________________

     str.indexOf(‘h’) returns _______________

     str.indexOf(‘o’) returns _______________

     str.indexOf(‘o’, 5) returns _______________

     str.indexOf(‘o’, 9) returns _______________

Explanation / Answer

What is your question, please clarify? Do you just need the answers or you need to write a function that returns that? If you need just answers to above function, they are as follows:

str = "hello, world";

str.length()   returns 12

str.indexOf(‘h’)   returns 0

str.indexOf(‘o’)   returns 4

str.indexOf(‘o’, 5)   returns 8

If you need a function that will return above answers, please specify the language in which you need it, I hope we will be able to help you.

Thanks

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