Write and export as default a function that takes a string as input and returns the length of the longest sequence of unique characters. A substring may contain a single character. For instance, from the
qweqrty string you can get the following substrings:
weqrty will be the longest one.
getLongestLength('abcdeef'); // 5 getLongestLength('jabjcdel'); // 7 getLongestLength(''); // 0
- To get an array index of an element, use .indexOf() method
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