[Codewars] Remove consecutive duplicate words (7 kyu) / JavaScript

https://www.codewars.com/kata/5b39e91ee7a2c103300018b3

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DESCRIPTION:

Your task is to remove all consecutive duplicate words from a string, leaving only first words entries. For example:

"alpha beta beta gamma gamma gamma delta alpha beta beta gamma gamma gamma delta"

--> "alpha beta gamma delta alpha beta gamma delta"

Words will be separated by a single space. There will be no leading or trailing spaces in the string. An empty string (0 words) is a valid input.

 

코드

function removeConsecutiveDuplicates(string) {
  return string.split(' ').reduce((a, b) => {
    if(a[a.length - 1] !== b) a.push(b);
    return a;
  }, []).join(' ') || '';
}