Explain the use of the 'this' keyword in TypeScript classes and functions.
Instruction: Provide examples to illustrate how 'this' behaves in different contexts within TypeScript.
Context: Tests the candidate's understanding of the 'this' keyword in TypeScript, including its use in classes and functions, and how to type 'this' for method chaining or callback functions.
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Thank you for posing such an insightful question. It really gets to the core of understanding the nuances of TypeScript, especially when it comes to the use of the 'this' keyword in various contexts...