Get the length of the longest item in an array.
base on jonschlinkert/longest
import longest from "https://deno.land/x/longest/mod.ts";
longest(['a', 'abcde', 'abc']);
//=> 'abcde'
longest(['a', 'abcde', 'abc']).length;
//=> 5
deno_longest is released under the MIT License. See the bundled LICENSE file for details.