2185. Counting Words With a Given Prefix

#### QUESTION:

You are given an array of strings words and a string pref.

Return the number of strings in words that contain pref as a prefix.

A prefix of a string s is any leading contiguous substring of s.

Example 1:

``````Input: words = ["pay","attention","practice","attend"], pref = "at"
Output: 2
Explanation: The 2 strings that contain "at" as a prefix are: "attention" and "attend".
``````

Example 2:

``````Input: words = ["leetcode","win","loops","success"], pref = "code"
Output: 0
Explanation: There are no strings that contain "code" as a prefix.
``````

Constraints:

``````1 <= words.length <= 100
1 <= words[i].length, pref.length <= 100
words[i] and pref consist of lowercase English letters.
``````

#### EXPLANATION:

easy的题目, 直接一个for循环判断就可以.

#### SOLUTION:

``````class Solution {
func prefixCount(_ words: [String], _ pref: String) -> Int {
var result:Int = 0
for word in words {
if word.hasPrefix(pref) {
result += 1
}
}
return result
}
}
``````
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