Problem: Count Items Matching a Rule

Statement

You are given an array items, where each items[i] = [type_i, color_i, name_i] represents the type, color, and name of the $i^{th}$ item. You are also given two strings, ruleKey and ruleValue, that together define a matching rule.

An item is considered a match if any of the following conditions holds:

• ruleKey == "type" and ruleValue == type_i

• ruleKey == "color" and ruleValue == color_i

• ruleKey == "name" and ruleValue == name_i

Return the total number of items in items that match the given rule.

Constraints:

• $1 \leq$ items.length $\leq 10^4$ ...