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Add new extension method rindexOf #25

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Add new extension method rindexOf #25

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@enix223 enix223 commented Oct 8, 2016

rindexOf is used to get the last occurrence of the given substring. It is a reverse version of indexOf.

Sample usage as below:
rindexOf(substring)

"hello".rindexOf("hell"), // 0
"helloll".rindexOf("ll"), // 5
"hello".rindexOf("world") // nil

Test case for the new method is provided.

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