JavaScript(JS) string method - includes

The includes() method is a string method in JavaScript that is used to check whether a given string contains a specified substring or not.

Here is the syntax for the includes() method:

str.includes(searchString[, position])

Here, str is the original string you want to search in, and searchString is the substring you want to search for. The optional position parameter specifies the position within the str to start the search from, and if not specified, it starts from the beginning of the string.

The includes() method returns a boolean value true if the string contains the specified substring, and false otherwise.

Here is an example of using includes() method:

let str = "Hello World";
console.log(str.includes("World")); // true
console.log(str.includes("o")); // true
console.log(str.includes("o", 5)); // false

In the first console.log(), the includes() method returns true because the str contains the substring "World". In the second console.log(), it returns true because the str contains the substring "o". In the third console.log(), it returns false because the str does not contain the substring "o" starting from the 5th position of the string.