JS Type Casting, Converting, and Coercion

Basic conversion between strings and Numbers is a simple task most of the time. However, there is actually a lot going on behind the scenes when working with different JavaScript operators, their precedence, and converting, casting, and coercing values and objects between different primitive values.

[aakashsingh]

I have learned a lot by coming to your channel. Thanks a lot for it!

[rmnkot]

Very important core knowledge! Thanks, as always!

[serhii]

Thanks!

A couple of nuances ;)

+{} // NaN
+[1] // 1
+[1, 2] // NaN

"If an object has no primitive value, valueOf returns the object itself."
(c) MDN

[BrendanMetcalfe]

Looks like you put in a lot of work on this! Good work man

[Robert-cwev]

Thanks for video!
I've also looked at other explanations on internet and I found out that:
- "" to number is 0;
- [] to number is 0, because it first converts to string which is "", then it converts "" to number which is 0;
- "" == 0 its true. So equals operator converts both to number, which means that "" to number is 0.

[tracyadams]

Great video. Any chance you could post the link to the operator precedence reference?

[joaovaz]

Great video, always!
A question: isn't an empty array a falsy value?

[siddharthapothan]

Your videos are really helpfull, learnt a lot. But is Number({}) value 0? Thanks!!!

[guignolguignol]

is there in ASP classic or javascript function like CURL in PHP

[jassihambran]

hey steve. Could you help us in how to setup terminal to run javascript files without any extension?Thanks in advance

[NairiKhachatryan]

let emptyStr = '' Number(emptyStr) // 0