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Introduction to TypeScript

Getting Started

Run:

npm install -g typescript@latest
npm install

Most of the exercises in this repo don't compile properly (it's your job to fix them!), but to make sure your environment is set up properly, start by running the Frankenstein script: npm run frankenstein

If this succeeds, you can continue with the exercises. You can run them in the same way you brought Frankenstein to life, e.g.: npm run variableTypes

Once you've completed the first file, replace the filename with the next test file and keep going.

Linting

TypeScript works best in conjunction with linting. If you haven't used it before, linting is like the green underline in a Word document - it isn't a typo (won't break your code), but there's an issue nonetheless and it's a good idea to fix it.

To run the linter in this project: npm run lint

Some of the things the linter picks up (that the TypeScript compiler doesn't) include:

  • Missing return type on a function
  • Explicit 'any' type used (instead of using 'any', try union types.)

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Some exercises for learning the basics of TypeScript

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