count-items-matching-a-rule.js

// You are given an array items, where each items[i] = [typei, colori, namei] describes the type, color, and name of the ith item. You are also given a rule represented by two strings, ruleKey and ruleValue.
// The ith item is said to match the rule if one of the following is true:
// ruleKey == "type" and ruleValue == typei.
// ruleKey == "color" and ruleValue == colori.
// ruleKey == "name" and ruleValue == namei.
// Return the number of items that match the given rule.

// Link: https://leetcode.com/problems/count-items-matching-a-rule/description/

//1st soln O(n)

var countMatches = function(items, ruleKey, ruleValue) {
    let count = 0;

    for(let i=0; i< items.length; i++) {
        if(ruleKey === "type" && ruleValue === items[i][0]) count++;
        else if(ruleKey === "color" && ruleValue === items[i][1]) count++;
        else if(ruleKey === "name" && ruleValue === items[i][2]) count++;
    }

    return count;
};