@nick/is/has-methods

hasMethods

Signature

function hasMethods<T, K extends readonly PropertyKey[]>(it: T, ...keys: K): it is Extract<T, {
     [P in [object Object]]:
    P extends keyof T ? T[P] extends Fn ? T[P] : never : Fn
  }>;

Checks if the given value contains methods for all of the specified keys. No other properties or traits are checked by this guard, such that the target value may be even be a primitive value like a string or number.

Parameters

Name	Info
it	The object to check.
keys	The keys to check for.

Returns

true if the object has all the specified keys, and each key is a callable method; otherwise, false.

Category

Guards

Examples

import { hasMethods } from "@nick/is/has-methods";

const obj = { foo: () => "foo", bar: () => "bar", baz: 42 };

console.assert(hasMethods(obj, "foo", "bar")); // OK

import { hasMethods } from "@nick/is/has-methods";

const ab = new ArrayBuffer(8);

console.assert(hasMethods(ab, "slice")); // OK

// checking if resizable array buffer methods are available
if (hasMethods(ab, "resize", "transfer")) {
  console.log("Great news - the RAB proposal is supported!");
}

hasMethods

Signature

function hasMethods<K extends readonly PropertyKey[]>(
  it: unknown,
  ...keys: K
): it is {
  [P in undefined]: Fn;
};

hasMethods

Signature

function hasMethods(it: unknown, ...keys: PropertyKey[]): boolean;

hasMethods

Signature

function hasMethods(it: unknown, ...keys: PropertyKey[]): boolean;