ABCnagrams

In this puzzle, you're given 26 scrambled clues, each representing a JS term (keyword, function, API name, etc.) with one missing letter. Your task is to figure out the missing letter, add it back, and unscramble the result to reveal the correct JS term. All missing letters are unique and don't repeat. The words and letters are not in alphabetical order. Some of the JS terms may be deprecated, some others may be experimental.