Is a single for-loop always O(N)?
Almost always, assuming it iterates from 0 to N. If the loop increments by multiplying (i *= 2), it is logarithmic, not linear.
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More FAQs in Understanding O(N) Linear Time Complexity
It means the runtime of the algorithm grows directly and proportionally with the size of the input data.
Methods like 'indexOf' or 'includes' cannot magically find data; they run a hidden for-loop through the array to check each element, which takes O(N) time.
Yes, because Big O classifies the algorithm based on its worst-case potential, which would be searching the entire array without finding the item until the end.
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