1773. Count Items Matching a Rule

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.

Example 1:

```Input: items = [["phone","blue","pixel"],["computer","silver","lenovo"],["phone","gold","iphone"]], ruleKey = "color", ruleValue = "silver"
Output: 1
Explanation: There is only one item matching the given rule, which is ["computer","silver","lenovo"].
```

Example 2:

```Input: items = [["phone","blue","pixel"],["computer","silver","phone"],["phone","gold","iphone"]], ruleKey = "type", ruleValue = "phone"
Output: 2
Explanation: There are only two items matching the given rule, which are ["phone","blue","pixel"] and ["phone","gold","iphone"]. Note that the item ["computer","silver","phone"] does not match.```

Constraints:

• `1 <= items.length <= 104`
• `1 <= typei.length, colori.length, namei.length, ruleValue.length <= 10`
• `ruleKey` is equal to either `"type"`, `"color"`, or `"name"`.
• All strings consist only of lowercase letters.

1773. Count Items Matching a Rule
``````struct Solution;

impl Solution {
fn count_matches(items: Vec<Vec<String>>, rule_key: String, rule_value: String) -> i32 {
let i = match rule_key.as_str() {
"type" => 0,
"color" => 1,
"name" => 2,
_ => panic!(),
};
items
.into_iter()
.filter(|item| item[i] == rule_value)
.count() as i32
}
}

#[test]
fn test() {
let items = vec_vec_string![
["phone", "blue", "pixel"],
["computer", "silver", "lenovo"],
["phone", "gold", "iphone"]
];
let rule_key = "color".to_string();
let rule_value = "silver".to_string();
let res = 1;
assert_eq!(Solution::count_matches(items, rule_key, rule_value), res);
let items = vec_vec_string![
["phone", "blue", "pixel"],
["computer", "silver", "phone"],
["phone", "gold", "iphone"]
];
let rule_key = "type".to_string();
let rule_value = "phone".to_string();
let res = 2;
assert_eq!(Solution::count_matches(items, rule_key, rule_value), res);
}
``````