Solutions: Longest run
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// Here's the explanation of the challenge -- when you're done reading it,
// click on `main.js` above to get started with the challenge!
// Have you ever sat by the road and counted the cars as they pass by?
// Sometimes coincidences happen and you see three yellow cars in a row.
// Let's use code to keep track of the cars!
// ## Description
// In this challenge, you will write a `longestRun` function that receives a
// list (array) as an argument. Each element in the list is a string
// containing a color. The list represents the colors of the different cars
// you see running down the road.
// For example, if you see a red car, then two blue cars and then a yellow
// car, your function would be invoked like:
// longestRun(["red", "blue", "blue", "yellow"])
// Your function should return the name of the color that has the longest run.
// That is, the color that appears the most times in a row, next to itself,
// without other colors in between.
// For example, if you see two blue cars, then four red cars,
// and then three blue cars, the red cars are the ones that had the longest
// run, as there was a run of four red cars. Even if there were more blue
// cars _in total_, the longest **uninterrupted** run was that of the red cars.
// You can assume that the list will not be empty, and that a single color
// appears the most times in a row.
JavaScript
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