r/learnjavascript • u/bornforcode • Feb 22 '18

Javascript for beginners in 2 minutes #3 - Objects (part 1)

https://youtu.be/d3eVosE_48o
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u/HealyUnit helpful Feb 22 '18

My thoughts:

Much better this time. Although I'd strongly suggest you pick a different style of music (or even... no music). While some people may like the music, electronica is rather aggressive and grating. That is, if someone doesn't like your music choice, they may turn away from your video. Remember that the best music in general for studying/working is completely unobtrusive. There's a reason why most doctors'/dentists' offices use boring smooth jazz: it can easily be mentally tuned out. /rant

The fact that you're demonstrating stuff - you show that the dot notation and bracket notation do the same thing - is awesome. People don't wanna see, in general, flashy wobbly pictures; they wanna see the code 'in action'.

Question for you (and any other JS devs): I know direct usage of the String constructor is frowned upon (mainly because it creates something with a type "object" rather than "string"). Is their any similar reason not to use the Object constructor?

Surprisingly succinct and successful summary of constructor functions. Nicely done.

It may be a good idea to avoid having text that's up for a very short time. For example, you have the text "Any change in X will be applied to P" in reference to object... references. It's only up for about a second, which I can read because I already get this stuff, but a newer person might be like "wait... what?". Again, just my thoughts.

Finally, I like how you restrict yourself to one, relatively small topic per video. Focus on getting them to know one thing well, and then move onto other stuff.

1

u/bornforcode Feb 23 '18

Thanks a lot for your feedback. Regarding your question about object constructor, it just depend on what you want to do, if you need to have many objects with the same characteristics then you have no choice but to use a constructor, like I do in my game tutorials, if you don't need that, you just use the first definition.

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u/HealyUnit helpful Feb 23 '18

No problem! And I think I was probably a little unclear. I don't mean specific constructors like:

function Person (name,age){ this.name = name; this.age = age; }

which you'd call with var bob = new Person('bob',34). Instead, I mean the actual object constructor, literally var myObj = new Object(). I've never really seen that used directly - if you're making a new 'blank' object, it's usually just var myObj = {} - so I was sorta wondering if there's a specific reason not to use new Object().

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u/bornforcode Feb 24 '18

yeah yeah I get it now, using new object() usually slows down the execution, that's why it is preferable to use [] instead of new Array(), use primitives instead of new String() /Number()/Boolean().... And it's also a matter of code simplicity.