I'm a bit confused as to why a1 is evaluated as false while a2 is considered to be of type boolean. Can someone explain the reasoning behind this discrepancy?
type Includes<T extends readonly any[], U> = U extends T[number] ? true : false;
type a1 = boolean extends [true, 2, 3, 5, 6, 7] ? true : false;
type a2 = Includes<[true, 2, 3, 5, 6, 7], boolean>
when you verify the value at position T[number]
[number] signifies the index in the array
if you only check the type T, you will obtain the same outcome
type Includes<T extends readonly any[], U> = U extends T? true : false;
type a1 = boolean extends [true, 2, 3, 5, 6, 7] ? true : false;
type a2 = Includes<[true, 2, 3, 5, 6, 7], boolean>
refer to the example for better understanding
type IsExtends<T extends any[] >=T[0] extends number ? true : false;
type b1 = IsExtends<[ true ,2,3]> // b1 = false
type b2 = IsExtends<[ 1 ,2,3]> // b2 = true
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