difference

Returns the values which is included in the first array (xs) but not included in the second array (ys).

It checks if two values are equal by triple-equals operator (===).

function difference<T>(
  // First array
  xs: T[],
  // Second aray
  ys: T[]
): T[];

Example

difference([1, 2, 3], [1, 2]); // [3]