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Basic Array Indexing

EasyNumPy Indexing

Problem Statement

Access elements from a NumPy array using basic indexing.

Background

NumPy supports powerful indexing:

  • arr[i] - single element
  • arr[i, j] - element at row i, column j (for 2D)
  • Negative indices count from end

Your Task

Write a function get_elements(arr) that returns a dictionary with:

  • "first": First element
  • "last": Last element
  • "middle": Middle element (use len//2 for index)

Output Format

Return a dictionary with exactly these three keys.

Example:

Input:
[10, 20, 30, 40, 50]
Output:
{'first': 10, 'last': 50, 'middle': 30}
Reasoning:

Index 0 for first, -1 for last, len//2 for middle

Constraints:

  • Use standard indexing arr[i]
  • Use negative indexing for last element
  • Array will have at least 1 element
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Test Results

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Run code to see test results.