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Exercises

Hoisting

  1. Implement function containing local variable with hoisting.
  • Commit example to github.
  • Use eslint to find this problem.
  • Fix example manually and commit it to github.

Scalar value vs Reference

Prepare two implementations of inc function:

  1. First with signature inc(n: number): number, call example: const a = 5; const b = inc(a); console.dir({ a, b });
  2. Second with signature inc(num: Num) where Num is object with field n, so function will change field of the object passed by reference, call example: const obj = { n: 5 }; inc(obj); console.dir(obj);

Types

  1. Count different type values in array.
  • Prepare array with values of different types, for example: [true, 'hello', 5, 12, -200, false, false, 'word'] but preferably longer and more varied.
  • Prepare collection-object (hash) with type names as keys and 0 as values, for example: { number: 0, string: 0, boolean: 0 }
  • Iterate array with for..of loop and increment occurrence counter there to get collection of types occurrences count for all types in array.
  • Modify this example: remove all keys from initial collection literal and add all keys dynamically from the loop.