KeyMap

KeyMap[f,<|key1->val1,key2->val2,…|>] maps f over the keys in an association, giving <|f[key1]->val1,f[key2]->val2,…|>.

KeyMap[f] represents an operator form of KeyMap that can be applied to an expression.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.