What is a String?
A string is similar to an Array, but uses different syntax.
string.includes(searchvalue, start)
searchvalue This is required and is the string to search for.
start this is optional and the default is set at 0. This is the position to start your search.
The return value is also a Boolean -- a.k.a. true or false
Example of fromIndex with String:
Ex.1:
// var arr = ['red', 'blue', 'yellow'];
--> When the default index sets at 0
arr.includes('yellow', 3); // false
arr.includes('yellow', 100) // false
Ex.2:
var str = "Hello world, welcome to the universe.";
var n = str.includes("world");
--> the result of 'n' will be: true
Ex.3:
var arr = ['a','b','c'];
var str = "abc";
console.log(arr.length); // 3
console.log(str.length); // 3
console.log(arr[0]); // a
console.log(str[0]); // a
console.log(arr === str); // false
console.log(typeof str); // string
console.log(typeof arr); // object