27_string_interpolation

Jul 13, 2026 07:16 · 5:19 · English · Whisper Turbo · 2 സ്പീക്കറുകള്‍

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Let's start by having a closer look at string interpolation.

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Here in the server component,

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I don't want to output this here in the HTML code

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like this.

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I don't want to hard code the output here.

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It would be realistic that our server component contains

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information about a specific server.

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So maybe here in the template file,

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we want to output server with ID

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and then some

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dynamic id here is and

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then the status like offline so we have two dynamic fields here

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now it would make sense to kind of derive them

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in typescript code in a real app that might be derived from http

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request you make to some back end or some calculation for

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now i will hard code it in here so we might have a server

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And I will assign a value of,

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let's say, 10,

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so a number.

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And I might also have a server status,

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which is a string offline.

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So two different types,

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a string and a number.

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And though not necessary,

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you could also be very explicit by assigning the type with TypeScripts

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feature here of adding a colon after the property name and then the type.

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It will infer it automatically though,

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so this is not required.

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I'm just doing this here for demo purposes.

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So now I want to output these two properties in

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my template.

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And to get this connection,

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we need data binding because you learned it's all about the communication between your types

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root code and the template.

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So,

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string interpolation is a typical use case here or a typical solution

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for this task here.

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Instead of the placeholder,

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I use my double curly braces,

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opening and closing.

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This is the string interpolation syntax.

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And in between these double curly braces,

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you can now write a TypeScript expression.

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So the easiest expression is to simply reference a property

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like the server ID.

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And this is a common use case that you only output

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a property here or the value of the property.

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However,

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it's not the only use case.

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You could also,

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for example,

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here for server,

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simply hardcode a string in there.

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Any expression which can be resolved to a string in

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the end.

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That's the only condition for a string interpolation syntax here.

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So whatever you have between the curly braces,

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in the end,

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it somehow has to return a string.

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So you could also call a method here which returns a string in the end.

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The only other restriction is you...

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can't write multi -line expressions here.

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You can't write block expressions in here.

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So you can't add a if or a for control

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structure in here.

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You could use a ternary expression though.

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So this is what you can do.

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Now let's also replace the last placeholder.

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And here I will again just reference a property,

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the server status.

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Now, this is string interpolation in usage and

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you see that we have an expression which is a string itself and then two other expressions

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which simply point to properties.

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And again,

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you could also call a method here which returns a string.

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Now,

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interesting,

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the server ID is not a string but a number.

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And I just said that string interpolation has to resolve

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to a string in the end,

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has to get a string in the end.

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So let's see if this works.

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If we save this with ng serve still running,

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let's also change app server back to app servers to

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make this work again.

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We see server with ID 10 is offline.

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We see it twice because we repeat this component and each component of course has the same

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content, but we see that string interpolation is working and

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that it especially

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is also working here for our number.

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So ID 10,

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that is not an issue.

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That is working fine because a number can be easily converted

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into a string.

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So yes,

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you have to get a string in the end or something which can be converted

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to a string to really be correct here.

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This is how you can use string interpolation.

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And now to really complete the example,

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let's say the server status here.

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is somehow returned in a method get server status

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could be the method name this is how you define a method in typescript

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so you might know this kind of method definition from other languages

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and here we simply return this server status

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So we return the property here.

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We could, of course,

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have accessed as it directly as we already did.

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But just to demonstrate that you can call a method,

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here I am calling a method.

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GetServerStatus,

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of course,

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leads to the same output because,

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again, all this method does is it returns us a string

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in the end or something which can be converted to a string.

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That is string interpolation in action.

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