JavaScript related question.

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings. And Explain.

For example,

Given [[0, 30],[5, 10],[15, 20]],

return false.

Missing Ranges:

Given a sorted integer array where the range of elements are in the inclusive range [lower, upper], return its missing ranges. And explain.

For example, given [0, 1, 3, 50, 75], lower = 0 and upper = 99, return ["2", "4->49", "51->74", "76->99"].