All Pro Web Designs > > Learning Tutorials > Programming Languages > JavaScript > Data Types – Beau teaches JavaScript
Data Types – Beau teaches JavaScript
- January 15, 2024
- Posted by: MainInstructor
- Category: JavaScript
Video Title: Data Types – Beau teaches JavaScript
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The real question is how many people from The odin project are here? 🤔 TOP RULES!
Hey thanks for this I've been studying javascript till I got up to this thanks for clarifying these.
<3
Objects in JS seem to work like how I guess you would use a dictionary in Python
Need more explanation on symbol and objects
Bean means beautiful in French ! Where did you get that name you lucky guy
GRAND SUMMARY
Booleans – Watch in video.
Null – means nothing or zero if you do math with it ! Use when some variable has no value assigned to them.
Undefined – is not similar to null. means that a variable has either not been declared at all OR has been declared but holds no value. yield NaN if you do math with it. Is NOT zero.
Number – Watch in video.
Symbols – Their instances are unique and immutable. so if two symbols,
sym1 = Symbol ("foo") and sym2 = Symbol ("foo") are compared; sym1 === sym2 , it will give false.
if you typecast them both to string, it will give true ! but typecasting to string also means that it will print like "Symbol(foo)" in console …
Object – It is a collection of properties. Properties themselves are key-value pairs.
console.log("algo que seria genial, es que tuviera subtitulo en español.");
Q: At 6mins, are .make and .model the properties of the Object?
Thank you for your videos!
Guys I have also started my new channel JavaScript World, recently I have released a new video in data types , kindly watch and post comment if you want to give some suggestion .
Below is my link:
https://www.youtube.com/watch?v=A0r63v_MX8k
What's the point of:
var myNumber = null;
when:
var myNumber = 0;
takes fewer keystrokes?
Your name is very hard…………… what a difficult name? I can not synonym it though…………….
When do we use Symbol..exactly..? Excuse me could you write a brief example, please??
In the first example you did have to say….if(data === true) {….. I guess it just assumes true first???
Didn’t understand symbols
<script type="text/javascript">
var name1 = Symbol("Description 1");
var name2 = Symbol("Description 2");
name1 = "John"
name1 = "Smith"
console.log(name1);
</script>
If the value are unique than why John is overwriting Smith What is the use of Symbol in this code?
Thanks for these tutorials, big fan of FCC. Ok, the undefined and Null is not, ahem, well defined. :). Speaking from what I have learnt from FCC itself, here is an e.g. of undefined -a bit different from Null.
var test = function(a,b) {
a+b;
}
console.log(test(1,2)); //this will give you undefined
great tutorial
but i think it is a lot much easier to understand Object type:
var myCar = {
make = "Ford",
model = "Mustang"
};
Hi, nice video, I wonder what text editor are you using?
Great Tutorials! i like them
var a = function(){}; console.log(typeof a);
Hi Beau. Thanks for putting so much effort into this . This tutorial is just amazing.
I have a question. Why does plus operator and multiplication operator behave differently when used with a null value.
1 + null = 1;
but
1 * null = 0;
Do these videos follow along with the original JS track or the new beta JS track better?
any code editor will do just fine for Javascript
Hi, there is no data type null in javascript. If you declare a variable without initialization, it's type is "undefined". But if you initialize the variable to null, it's type is "object". As you said, null is a value that means "no value". Null is not a data type.
which code editor are you using?
Great tutorial!