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iamp;#39;ve got a puzzle for you iamp;#39;ve got three letters at the top here that are all expressed as a union so this letter can be either one of a b or c and i want to create a type helper to remove one of the letters so how do i do that because you think of like when something is an object or something is an array you can usually kind of map over it thereamp;#39;s some kind of iterator you can use but whatamp;#39;s the iterator when it comes to unions how do i map over each member of the union well it turns out that typescript does this automatically and this is whatamp;#39;s called distributivity in typescript and the way this works is we can actually treat these letters as though they were one thing as though they were for instance just c letamp;#39;s say and the way weamp;#39;re going to do that is weamp;#39;re just going to check t type so weamp;#39;re going to check if t type extends c and if not weamp;#39;re going to return never because never means that itamp;#39