# 1816. Truncate Sentence

## 題目概要

給定一個字串(句子)，並給定一個正整數 k，將字串中的前 k 個單字輸出。

Example 1:

Input: s = "Hello how are you Contestant", k = 4
Output: "Hello how are you"
Explanation:
The words in s are ["Hello", "how" "are", "you", "Contestant"].
The first 4 words are ["Hello", "how", "are", "you"].
Hence, you should return "Hello how are you".

Example 2:

Input: s = "What is the solution to this problem", k = 4
Output: "What is the solution"
Explanation:
The words in s are ["What", "is" "the", "solution", "to", "this", "problem"].
The first 4 words are ["What", "is", "the", "solution"].
Hence, you should return "What is the solution".

Example 3:

Input: s = "chopper is not a tanuki", k = 5
Output: "chopper is not a tanuki"

## 解題技巧

- 用 `splice` 來解，第一個參數為插入或刪除的索引位置，第二個參數為要刪除的元素數量，第三個參數為要插入的元素內容。這邊我們只是用 splice 來獲取前 k 個單字而已。

## 程式碼

/**
 * @param {string} s
 * @param {number} k
 * @return {string}
 */
var truncateSentence = function(s, k) {
    return s.split(' ').splice(0, k, '').join(' ');
};