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solution.js
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: qwe and weqrty. weqrty will be the longest one.
Examples
getLongestLength('abcdeef'); // 5
getLongestLength('jabjcdel'); // 7
getLongestLength(''); // 0
Tips
- To get an array index of an element, use .indexOf() method
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