Lesson 023
Arrays
Indexing · Access · Operations
1:00How arrays store ordered elements in contiguous memory, why index-based access is O(1), and the real costs of inserting, searching, and resizing.
By the end, you can
- Define an array and explain why its elements must be the same type and stored contiguously.
- Apply zero-based indexing to identify any element by offset and determine valid index ranges.
- Compute the memory address of `arr[i]` using the formula `base + i × size`.
- Explain why indexed access is O(1) while middle insert, delete, and unsorted search are O(n).
- Distinguish length from capacity in a dynamic array and describe what triggers a resize.
- Identify real-world scenarios where an array is the right data structure choice.
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