The longest word

Problem

Write a function that takes a phrase and returns its longest word. The words come separated by one space, with no commas or periods.

If two words are the same length, you return the first of them: with "cat dog" you return "cat".

If the phrase is empty, you return an empty text.

Examples

• "the cat sleeps" → "sleeps"

• A tie, the first one wins

  "cat dog" → "cat"

• A single word

  "python" → "python"

Besides these, the challenge has hidden tests that are revealed when you submit your solution.

You start with this

def longest_word(phrase):
    pass

function longestWord(phrase) {
}