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EasyPythonJavaScriptTypeScript

List Comprehension — Squares Filter

PythonListsFunctional

Given a list of integers, return a new list containing the square of each number that is strictly positive, using a single list comprehension.

Examples

  • solve([1, -2, 3, 0, -4, 5]) → [1, 9, 25]
  • solve([-1, -2, -3]) → []
  • solve([2, 4, 6]) → [4, 16, 36]

Constraints

  • Return an empty list if no positive number is found.
  • Do not mutate the input.
  • Your implementation must use a list comprehension (single expression, no for loop body).

In JavaScript / TypeScript — Chain filter and map in a single expression — JavaScript's equivalent of a list comprehension. Do not mutate the input.

Sample tests

Test #1Mixed positive, negative and zero
Input: [[1,-2,3,0,-4,5]]
Output: [1,9,25]
Test #2All negative — empty result
Input: [[-1,-2,-3]]
Output: []
Test #3All positive
Input: [[2,4,6]]
Output: [4,16,36]
Test #4Empty input
Input: [[]]
Output: []
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