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https://www.w3schools.com/jsref/jsref_obj_array.asp
The includes()
method determines whether an array contains a specified element and returns a boolean response.
This method returns true if the array contains the element, and false if not. Note: The includes() method is
case sensitive. ECMAScript 7+.
myArray.includes({element}, {start index (optional)})
https://www.w3schools.com/jsref/jsref_includes_array.asp
let fruits = ["Banana", "Orange", "Apple", "Mango"];
let demo1Response = fruits.includes("Pear");
document.getElementById("demo1").innerHTML = `Does fruits include Pear? Answer:
${(demo1Response.toString().toUpperCase())}.`;;
let demo2Response = fruits.includes("Apple");
document.getElementById("demo2").innerHTML = `Does fruits include Apple? Answer:
${(demo2Response.toString().toUpperCase())}.`;;
// with a starting position
let demo3Response = fruits.includes("Banana", 1);
document.getElementById("demo3").innerHTML = `Does fruits include Banana starting at position 2? Answer:
${(demo3Response.toString().toUpperCase())}.`;;