codejump
EasyPythonJavaScriptTypeScript

Unique Array

ArraysFunctions

Implement solve(arr) that returns a new array containing only the
first occurrence of each element, preserving the original order.

Examples

  • solve([1,2,1,3,2]) → [1,2,3]
  • solve([]) → []
  • solve(['a','b','a']) → ['a','b']

Constraints

  • Elements are compared by value (primitives only).
  • Maintain insertion order.

Sample tests

Test #1Empty array
Input: [[]]
Output: []
Test #2Numbers with duplicates
Input: [[1,2,1,3,2]]
Output: [1,2,3]
Test #3All identical
Input: [[1,1,1,1]]
Output: [1]
Test #4Strings
Input: [["a","b","a","c","b"]]
Output: ["a","b","c"]
Test #5Multiple duplicates scattered throughout
Input: [[3,1,4,1,5,9,2,6,5,3]]
Output: [3,1,4,5,9,2,6]
← All challenges