27_string_interpolation

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

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

Here in the server component,

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

like this.

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

It would be realistic that our server component contains

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S… Speaker 1 (27_string_interpolation)

information about a specific server.

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S… Speaker 1 (27_string_interpolation)

So maybe here in the template file,

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S… Speaker 1 (27_string_interpolation)

we want to output server with ID

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S… Speaker 1 (27_string_interpolation)

and then some

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S… Speaker 1 (27_string_interpolation)

dynamic id here is and

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

now it would make sense to kind of derive them

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

request you make to some back end or some calculation for

0:52

S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

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S… Speaker 1 (27_string_interpolation)

And I will assign a value of,

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S… Speaker 1 (27_string_interpolation)

let's say, 10,

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S… Speaker 1 (27_string_interpolation)

so a number.

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S… Speaker 1 (27_string_interpolation)

And I might also have a server status,

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S… Speaker 1 (27_string_interpolation)

which is a string offline.

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S… Speaker 1 (27_string_interpolation)

So two different types,

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S… Speaker 1 (27_string_interpolation)

a string and a number.

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S… Speaker 1 (27_string_interpolation)

And though not necessary,

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

It will infer it automatically though,

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S… Speaker 1 (27_string_interpolation)

so this is not required.

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S… Speaker 1 (27_string_interpolation)

I'm just doing this here for demo purposes.

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S… Speaker 1 (27_string_interpolation)

So now I want to output these two properties in

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S… Speaker 1 (27_string_interpolation)

my template.

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S… Speaker 1 (27_string_interpolation)

And to get this connection,

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

root code and the template.

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S… Speaker 2 (27_string_interpolation)

So,

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

for this task here.

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S… Speaker 1 (27_string_interpolation)

Instead of the placeholder,

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S… Speaker 1 (27_string_interpolation)

I use my double curly braces,

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S… Speaker 1 (27_string_interpolation)

opening and closing.

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S… Speaker 1 (27_string_interpolation)

This is the string interpolation syntax.

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S… Speaker 1 (27_string_interpolation)

And in between these double curly braces,

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S… Speaker 1 (27_string_interpolation)

you can now write a TypeScript expression.

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S… Speaker 1 (27_string_interpolation)

So the easiest expression is to simply reference a property

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S… Speaker 1 (27_string_interpolation)

like the server ID.

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S… Speaker 1 (27_string_interpolation)

And this is a common use case that you only output

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S… Speaker 1 (27_string_interpolation)

a property here or the value of the property.

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S… Speaker 1 (27_string_interpolation)

However,

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S… Speaker 1 (27_string_interpolation)

it's not the only use case.

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S… Speaker 1 (27_string_interpolation)

You could also,

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S… Speaker 1 (27_string_interpolation)

for example,

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S… Speaker 1 (27_string_interpolation)

here for server,

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S… Speaker 1 (27_string_interpolation)

simply hardcode a string in there.

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S… Speaker 1 (27_string_interpolation)

Any expression which can be resolved to a string in

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S… Speaker 1 (27_string_interpolation)

the end.

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

So whatever you have between the curly braces,

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S… Speaker 1 (27_string_interpolation)

in the end,

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S… Speaker 1 (27_string_interpolation)

it somehow has to return a string.

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

The only other restriction is you...

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S… Speaker 1 (27_string_interpolation)

can't write multi -line expressions here.

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S… Speaker 1 (27_string_interpolation)

You can't write block expressions in here.

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

structure in here.

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S… Speaker 1 (27_string_interpolation)

You could use a ternary expression though.

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S… Speaker 1 (27_string_interpolation)

So this is what you can do.

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S… Speaker 1 (27_string_interpolation)

Now let's also replace the last placeholder.

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S… Speaker 1 (27_string_interpolation)

And here I will again just reference a property,

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S… Speaker 1 (27_string_interpolation)

the server status.

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S… Speaker 1 (27_string_interpolation)

Now, this is string interpolation in usage and

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

which simply point to properties.

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S… Speaker 1 (27_string_interpolation)

And again,

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 2 (27_string_interpolation)

Now,

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S… Speaker 1 (27_string_interpolation)

interesting,

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S… Speaker 1 (27_string_interpolation)

the server ID is not a string but a number.

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S… Speaker 1 (27_string_interpolation)

And I just said that string interpolation has to resolve

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S… Speaker 1 (27_string_interpolation)

to a string in the end,

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S… Speaker 1 (27_string_interpolation)

has to get a string in the end.

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S… Speaker 1 (27_string_interpolation)

So let's see if this works.

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S… Speaker 1 (27_string_interpolation)

If we save this with ng serve still running,

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

make this work again.

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S… Speaker 1 (27_string_interpolation)

We see server with ID 10 is offline.

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

content, but we see that string interpolation is working and

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S… Speaker 1 (27_string_interpolation)

that it especially

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S… Speaker 1 (27_string_interpolation)

is also working here for our number.

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S… Speaker 1 (27_string_interpolation)

So ID 10,

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S… Speaker 1 (27_string_interpolation)

that is not an issue.

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S… Speaker 1 (27_string_interpolation)

That is working fine because a number can be easily converted

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S… Speaker 1 (27_string_interpolation)

into a string.

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S… Speaker 1 (27_string_interpolation)

So yes,

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

to a string to really be correct here.

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S… Speaker 1 (27_string_interpolation)

This is how you can use string interpolation.

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S… Speaker 1 (27_string_interpolation)

And now to really complete the example,

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S… Speaker 1 (27_string_interpolation)

let's say the server status here.

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S… Speaker 1 (27_string_interpolation)

is somehow returned in a method get server status

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

and here we simply return this server status

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S… Speaker 1 (27_string_interpolation)

So we return the property here.

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S… Speaker 1 (27_string_interpolation)

We could, of course,

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S… Speaker 1 (27_string_interpolation)

have accessed as it directly as we already did.

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S… Speaker 1 (27_string_interpolation)

But just to demonstrate that you can call a method,

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S… Speaker 1 (27_string_interpolation)

here I am calling a method.

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S… Speaker 1 (27_string_interpolation)

GetServerStatus,

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S… Speaker 1 (27_string_interpolation)

of course,

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S… Speaker 1 (27_string_interpolation)

leads to the same output because,

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

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

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S… Speaker 1 (27_string_interpolation)

That is string interpolation in action.

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