find string in array javascript

var fruits = ["Banana", "Orange", "Apple", "Mango"];

var n = fruits.includes("Mango");
 

var colors = ["red", "blue", "green"];
if(colors.indexOf("blue") !== -1){
	//colors contains the string "blue"
}else{
	//colors does not contain the string "blue"
}

var fruits = ["Banana", "Orange", "Apple", "Mango"];

var n = fruits.includes("Mango");

var myarr = ["I", "like", "turtles"];
var arraycontainsturtles = (myarr.indexOf("turtles") > -1);

var fruits = ["Banana", "Orange", "Apple", "Mango"];

var a = fruits.indexOf("Apple");
 

search = (arr, item) => { return arr.indexOf(item); }

function checkInput(input, words) {
 return words.some(word => input.toLowerCase().includes(word.toLowerCase()));
}

console.log(checkInput('"Definitely," he said in a matter-of-fact tone.', 
["matter", "definitely"]));

function checkInput(input, words) {
 return words.some(word => new RegExp(word, "i").test(input));
}

console.log(checkInput('"Definitely," he said in a matter-of-fact tone.', 
["matter", "definitely"]));