arrays

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How to Find the Product of All Elements in an Array Except Self? You must write an algorithm that runs in O(n) time and without using the division operation.
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Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[I]. The product of any prefix or suffix of nums is guaranteed to fit in a 32-bit integer. You must write an algorithm that runs in O(n) time and without using the division operation.

In this episode of Syntax, Scott and Wes talk about what is new in Javascript — a whole bunch of new stuff that you can use now and in the next sixth months or so.

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Show Notes

ES2019

04:03 - Array.flatMap()
05:30 - Array.flat()
07:37 - Array.fromEntries()
09:50 - String.trimStart() and String.trimEnd()
11:23 - Function.toString()
11:57 - Object Key Order

1. Integer keys in ascending order (and strings like “1” that parse as ints)
2. String keys, in insertion order (ES2015 guarantees this and all browsers comply)
3. Symbol names, in insertion order (ES2015 guarantees this and all browsers comply)

ES2020

14:50 - Big int
18:09 - Nullish coalescing
20:57 - Optional Chaining
24:55 - promise.allSettled
25:33 - Dynamic import
27:14 - string.matchAll(regex) and string.replaceAll
29:30 - globalThis
30:44 - Module Namespace Exports
33:11 - Navigator.share() API
36:34 - Async Hooks
37:39 - Pipline Operator
39:59 - Top Level Await

Links

• https://twitter.com/wesbos/status/1181584047144878080
• https://twitter.com/wesbos/status/1238472679893671938
• https://twitter.com/wesbos/status/1230515254687301635
• Regex101
• Regexr
• https://developer.mozilla.org/en-US/docs/Web/API/Navigator/canShare
• Sketch
• CloudApp
• Figma
• https://nodejs.org/api/async_hooks.html
• Gulp
• https://v8.dev/features/top-level-await
• https://github.com/tc39/proposal-pipeline-operator

××× SIIIIICK ××× PIIIICKS ×××

• Scott: Sapper
• Wes: Dewalt Oscillating Multitool

Shameless Plugs

• Scott: Level Up Tutorials Pro - Sign up for the year and save 25%!
• Wes: All Courses - Use the coupon code ‘Syntax’ for $10 off!

Tweet us your tasty treats!

• Scott’s Instagram
• LevelUpTutorials Instagram
• Wes’ Instagram
• Wes’ Twitter
• Wes’ Facebook
• Scott’s Twitter
• Make sure to include @SyntaxFM in your tweets

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

Freshbooks - Sponsor

This is episode Wes mentions the free book Breaking The Time Barrier. Get a 30 day free trial of Freshbooks at freshbooks.com/syntax.

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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

• Object.assign() - no longer needed because you can object spread

• Reference vs Copy in JavaScript

  ×SICK×PICKS×

• Scott: Tea Haus

• Wes: SOG Folding Knife
• Wes: Sharpening Stone

Shameless Plugs

• Vue.js for Everyone
• Wes' Course
• SMASH that Subscribe Button on Wes' YouTube

Tweet us your tasty treats!

• Scott's Instagram
• LevelUpTutorials Instagram
• Wes' Instagram
• Wes' Twitter
• Wes' Facebook
• Scott's Twitter
• Make sure to include @SyntaxFM in your tweets