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// You will be given an array of objects (associative arrays in PHP) representing data about developers who have signed up to attend the next coding meetup that you are organising.
// Your task is to return:
// true if at least one Ruby developer has signed up; or
// false if there will be no Ruby developers.
// For example, given the following input array:
// your function should return true.
//P: array of object
//R: return true if at least one Ruby developer has signed up;or return false if there will be no Ruby developers.