String.prototype.includes

Returns true if searchString appears as a substring of the result of converting this object to a String, at one or more indexes that are greater than or equal to index; otherwise, returns false.

Syntax

includes(searchString, position?)

Parameters

• searchString

  The string to search for.

• index optional

  If index is undefined, 0 is assumed.

Return value

true if the given searchString occurs at least once within this string, otherwise false.

Examples

"international".includes("nation")

true

"team".includes("I")

false