Docly Developers
Function Updated 17 Oct 2026

Array.includes(value, [fromIndex])

Checks whether the array contains a value.

See also Array.indexOf Array.some Array.find

Parameters

valueanyrequired

Value to search for.

fromIndexnumberoptional

Index to start searching from. A negative value counts from the end of the array.

Returns

true if the value is found, otherwise false.

Values are compared with .NET equality, without type conversion: "1" does not match 1, and an object matches only if it is the same instance. NaN is found.

Example

Normal JavaScript, running in the browser or on the Docly™ server.
const roles = ["editor", "admin"];
write(roles.includes("admin"));   // true
write("\n");
write(roles.includes("Admin"));   // false - the comparison is case-sensitive
write("\n");
write([1, 2, 3].includes(1, 1));  // false - the search starts at index 1