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Hello friends.

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Nice to see you back.

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In this video we are going to use symbol inside the object.

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So I'm going to remove these lines.

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And I'm going to create a new symbol late age.

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Equal to symbol.

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For now.

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It's empty.

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And then I'm going to create an object.

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So I'm going to take a variable name for object.

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Late user.

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Equal to inside the curly braces.

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Here I'm going to create the object.

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And we know we need to use value and key to create an object.

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Our first object key is name.

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And its value is at one.

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And our second object is class and it its value is class ten.

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And now I want to use this symbol as a key.

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In that case first we need to use square braces.

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And then we need to type symbol variable.

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H.

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And we need to provide value.

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So I'm going to type 25.

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It's a numeric value when we need to use symbol as the key inside the object.

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Then we need to use square braces.

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And inside the square braces we need to provide symbol variable.

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Let's try to print this object inside the console.

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So I'm going to type console dot log inside the parentheses our object name user user semicolon.

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To end this line.

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If I save this file you can see in my console it's print the object for our first video.

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It's print name second value it's print class.

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But for our third value it's print symbol.

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And we do not provide any description to our symbol.

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If you want then you can as a symbol value I'm going to type H.

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If I save this file this time it print symbol H.

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And there is another method to use symbol in our object.

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So I'm going to remove it.

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And also I remove this comma.

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And now I'm going to use this symbol in this object.

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So outside the object first I'm going to type object name user.

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And inside the square braces I'm going to take symbol variable name age equal to.

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And I'm going to assign a value 23.

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So this is the another way we can use symbol with object.

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So if I save this file you can see in my console it print out proper value.

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And as you know if you want to see the exact value of any key, you can just you need to type user dot

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class.

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If I save this file, you can see it's written the exact value plus ten.

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And if I want to show the symbol value.

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We cannot use this method.

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Let me show you if we try.

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So I'm going to duplicate this line and I'm going to change this variable name H.

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And if I save this code.

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You can see it.

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Print undefined.

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Class is our key.

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Edge is our key, but it works with class.

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Then why it is not work with edge.

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If we want to show exact single value.

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In that case, we don't need to use dot.

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We need to use square braces.

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So we need to move this variable inside the square braces.

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If I save this code you can see now it's written the result.

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So you need to remember for normal data type we can use dot.

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But for simple data type we need to use square braces.

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As you know we can print every object key or value using foreign loop.

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So let's use foreign loop and try to print every key in our console.

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So I'm going to type four inside the parenthesis.

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Let key in user.

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User means our object name.

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Then inside the curly braces console dot log inside the parenthesis key.

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If I run this code it going to print student name user name user class.

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But it is going to skip user is because it is a symbol.

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So I'm going to save this file.

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Now you can see in my console it print name class but it doesn't print each key.

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So it's print only to key name in class.

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But if I duplicate this line and try to insert another key name gender and his gender is male.

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So I'm going to type male.

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If I save this file, you can see it prints three key from our object name, class and gender.

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But it escape key because it's a symbol.

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So we cannot use symbol inside the foreign loop.

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And you need to remember it always.

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And you know why we use JavaScript object?

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Because we convert JavaScript object into a Json object and try to send data to the server.

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And if I try to convert this user object into a Json, once again it skip this value.

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Let me show you this.

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You can see we have four value in our object name, class, age, and gender.

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So first I'm going to remove this.

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I don't need this for loop.

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And now I'm going to convert this object into a Json file.

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So I'm going to use console dot log.

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Inside the parentheses I'm going to use json Stringified method json dot Stringify.

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Inside the parentheses I'm going to provide our object name, which is user.

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If I save this file you can see it returns a Json object.

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But if you notice edge value is missing.

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But if I just print this object in our console let's see.

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So I'm going to remove this parenthesis.

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And if I save this file you can see you can see my console symbol value.

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But in my Json object there is no symbol value.

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So we need to remember whenever we use symbol value in our object, we cannot use this value in our

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foreign loop.

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And also we cannot convert this value into a Json object.

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And if you really want to convert it, then we need to convert this symbol value into a string.

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As I told you earlier, we use the description method to convert the symbol into a string, and then

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we can convert it into a Json object.

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We do not directly convert symbol into a Json object.

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So basically this is our new datatype symbol symbols mean unique value.

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It is rarely used.

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I hope now it's clear for you.

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What is symbol datatype?

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Thanks for watching this video.