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Implement the JavaScript Array.concat function in the type system. A type takes the two argument

Implement the built-in Exclude<T, U>

Exclude from T those types that are assignable to U

Implement a generic First<T> that takes an Array T and returns its first element's type.

For

Implement the util type If<C, T, F> which accepts condition C, a truthy value T, and a falsy

Implement the JavaScript Array.includes function in the type system. A type takes the two argume

Returns true if all elements of the list are equal to the second parameter passed in, false if the

Implement type AllCombinations<S> that return all combinations of strings which use characte

Implement Python liked any function in the type system. A type takes the Array and returns `true

Find the elements in the target array that appear only once. For example：input: `[1,2,2,3,3,4,5,6,

For given function type Fn, and any type A (any in this context means we don't restrict the ty