feat(chapter_hashing): Add js and ts codes for chapter hashing (#675)
* refactor(chapter_hashing): Remove unnecessary chaining operator
* feat(chapter_hashing): Add js and ts codes for chapter 6
* refactor(chapter_hashing): Optimize the remove function logic
* refactor(chapter_hashing): Remove unnecessary chaining operator
* refactor(chapter_hashing): use const instead of let
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