`String.prototype.includes()`

Determines whether a string contains the given substring.

Since ES2015 Spec ↗

Syntax

str.includes(searchString, position)

Name	Type	Required	Description
`searchString`	`string`	Yes	The substring to search for.
`position`	`number`	No	Position within the string to begin searching. Defaults to 0.

boolean — true if the substring is found; otherwise false.

console.log('hello world'.includes('world'));

Output

true

console.log('hello'.includes('H'));

Output

false

Case-sensitive. Cannot be used with a regular expression (throws TypeError if given one). Returns true when searching for an empty string.