Anonymous lambdas can be okay, but I often create a named function to make things a bit more clear. For example, here you could write something like:
const strs = ['hello', 'goodbye', 'farewell', 'aloha']
const longerOfPair = (str1, str2) => str1.length >= str2.length ? str1 : str2
const longest = strs.reduce(longerOfPair, '') // > farewell
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