Study prototypes, this keyword binding ( call , apply , bind ), and ES6 class translations.
This problem tests string manipulation, array transformation, and conditional logic. javascript
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Problem: Remove duplicates from an array while preserving order. Solution sketch:
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What is the difference between var , let , and const ?Var is function-scoped and hoisted. Let and const are block-scoped. Const prevents reassignment, while let allows it.
Don't just read the answers. Explain them aloud as if you are in the interview. Study prototypes, this keyword binding ( call ,
How objects inherit properties.
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