javascript在数组中查找单词

const words = ["apple", "banana", "orange"];
const index = words.indexOf("banana");
if (index !== -1) {
  console.log("单词存在于数组中");
} else {
  console.log("单词不存在于数组中");
}

const words = ["apple", "banana", "orange"];
if (words.includes("banana")) {
  console.log("单词存在于数组中");
} else {
  console.log("单词不存在于数组中");
}

const words = ["apple", "banana", "orange"];
const foundWord = words.find(word => word === "banana");
if (foundWord) {
  console.log("单词存在于数组中");
} else {
  console.log("单词不存在于数组中");
}

const words = ["apple", "banana", "orange"];
const foundWords = words.filter(word => word.includes("a"));
if (foundWords.length > 0) {
  console.log("单词存在于数组中");
} else {
  console.log("单词不存在于数组中");
}

const words = ["apple", "banana", "orange"];
const capitalizedWords = words.map(word => word.toUpperCase());
console.log(capitalizedWords);