Unique Characters with Set

Easy

Set

Map

String

10 min

78.5%

Description

Solution

Given a string, find the number of unique characters using JavaScript Set and Map data structures.

Example 1:

Input: s = "hello"

Output: 4

Explanation: The unique characters are 'h', 'e', 'l', 'o'. Note that 'l' appears twice but is counted once.

Example 2:

Input: s = "programming"

Output: 8

Explanation: The unique characters are 'p', 'r', 'o', 'g', 'a', 'm', 'i', 'n'.

Code Editor

Shyam Kunwar