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Basic TypeScript

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In Praxis Tutor in Visual Studio Code, complete the first two categories: Basic TypeScript and Numbers & Strings. After you have done these categories, your Praxis Tutor pane in Visual Studio Code should show the categories fully checked off with a green checkmark: It will be useful for us to draw pictures of what’s happening at runtime, in order to understand subtle questions. Snapshot diagrams represent the internal state of a program at runtime: its stack (methods in progress and their local variables) and its heap (objects that currently exist). Here’s why we use snapshot diagrams in 6.102: Although the diagrams in this course use examples from TypeScript, the notation can be applied to any modern programming language, e.g., Python, Java, C++, Ruby. The simplest kind of snapshot diagram shows a variable name with an arrow pointing to the variable’s value: When we want to show the type of the value, or show more of its internal structure, we use a circle labeled by its type: Snapsho

Basic TypeScript Basic TypeScript Objectives Learn basic JavaScript and TypeScript syntax and semantics Transition from writing Python to writing TypeScript Getting started with TypeScript In Praxis Tutor in Visual Studio Code, complete the first two categories: Basic TypeScript and Numbers & Strings. You may want to make the Praxis Tutor pane larger . Make it wider by dragging the splitter bar on the right edge of the Explorer pane, and make it taller by making sure all the other tabs in the Explorer pane are collapsed, as shown in the image below. (Later, when you are not using the Tutor, yo

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