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Here.

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You can see I opened my Visual Studio Code editor, and I also create a HTML file.

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And I open this HTML file using live server extension in this browser.

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First I'm going to type script tag.

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Inside the script tag, I am going to create a symbol.

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So I'm going to create a variable.

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Let ID equal to S should be capital symbol.

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Let's print this symbol in our console.

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So I'm going to type console dot log inside the parentheses id.

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If I save this file you can see in my console it print.

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It's a symbol.

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And I'm going to assign a identifier to the symbol.

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So I'm going to type hello.

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It may be string, may be number, whatever.

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And if I set this file you can see my console.

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It's print.

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Hello.

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And if I show you the data type.

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So I'm going to duplicate this line.

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And I'm going to print.

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Type of ID.

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And if I save this file, you can see it's been symbol.

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Symbols mean one unique value.

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Let's try to prove it.

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How it is a unique value.

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So I'm going to duplicate this line and change the name ID to.

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You can see it's looking same and their value is same.

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But if I compare this to variable it's return false.

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Let's compare it.

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ID equals to equals to id two.

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If I save this file you can see it returns false.

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Its mean these two variables values are not same.

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Its look pretty similar but it is not same.

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But if we use string let me show you that.

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So I'm going to duplicate this line.

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And I'm going to change the name as tr one and str two.

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Now they are string, not symbols.

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So I'm going to remove this symbol keyword.

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And also I'm going to remove this one.

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And now I'm going to compare this to value.

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So inside console dot log section I'm going to type T, r1 and str2 and I'm going to comment out this

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one.

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If I save this file you can see it returned true because in that case they are not symbol.

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They are string.

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And two variables.

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Values are same.

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They are not unique value.

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One thing remember we cannot use symbol value directly in our document.

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Let me show you that.

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So I'm going to remove this lines.

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I don't need this lines for now.

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And also I'm going to remove these lines.

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As I say, we cannot print symbol value in our document.

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If I try to print.

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So I'm going to use a alert.

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Alert inside the parentheses I'm going to print ID.

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If I run this code it's written error.

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So I'm going to save this code.

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And you can see type error.

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And also it print cannot convert a symbol value to a string.

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If you want to convert symbol value into a string then you need to use some method to convert symbol

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value into a string.

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Let me show you that.

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So we need to use two string method id dot two string.

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Using this method we can convert symbol variable into a string.

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If I save this file now, it's work properly.

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You can see in my alert symbol.

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Hello.

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So we need to use two string method to convert symbol into a string.

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And then we can use this symbol value in our document.

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And if you want to see the exact value of symbol then we need to use a different method.

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In that case we do not use two string method.

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So I'm going to remove it and I'm going to type id dot description.

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It's a not a function, so we don't need to use round braces.

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It is just a simple method.

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So if I save this file, you can see in my alert section.

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Now it is just print.

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Hello means our message.

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In the next part of this video I am going to show you how can we use symbol into a object?