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April 25th, 2018 ×

20 JavaScript Array and Object Methods to make you a better developer

Wes Bos

Wes Bos Host

Scott Tolinski

Scott Tolinski Host

or
Show Notes Transcript

Wes and Scott rattle through ~20 different Object and Array Methods that will make you a better JavaScript developer.

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Show Notes

For the docs for all these, just google mdn and the method you are looking for 😃

3:00

  • Why are these great?
  • They are chainable
  • Immutable

5:30

  • .filter()
  • Truthy or Falsy

8:00

  • .map()

10:00

  • .reduce() - returns any shape! filter, create a new shape, add up numbers...

14:30

  • .forEach()
  • Side effects

16:00

  • .some()
  • can be used as a short circuit forEach

25:00

  • .every()
  • .includes() (why not contains?)

26:00

  • Array.from()
  • Array.from() takes a secondary map arg
  • Array.of()

29:00

  • Object.values()
  • Object.keys()
  • Object.entries()

32:00

  • Array spread - converts iterable to array
  • Array spread - Concats arrays
  • Array Spread + Slice. Don't splice - remove an item from an array.

34:00

  • Object Spread

37:00

  • Function Rest

39:00

  • Object.freeze()

40:00

  • Object.seal()

41:00

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