121. Managing Recipes in a Recipe Service

Jul 15, 2026 05:14 · 4:07 · English · Whisper Turbo · 2 Звучници

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

What should our recipe service do for us?

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

I guess it makes sense if the recipe service is the

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place in our app where we manage our recipes.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Therefore,

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we should take our recipes,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

which we currently manage in our recipe list,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

and manage it in the recipe service.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

That's the first thing with which I'll start,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

so I'll simply copy it for now.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

and add it as a property in the recipe service.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Of course,

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we now have to add the import pointing to the recipe model file,

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which sits in the same folder as the service.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

So with that,

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we get an array of recipes in the recipe service.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

And I will actually make this private so that

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you can't directly access this array from outside.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Now with this added,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

I also want to add a getRecipes method,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

which will return this array so that we can get access to it from outside.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

If I were to return it like this,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

I actually return the direct reference to this array,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

and since arrays and objects are reference types in JavaScript,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

so it has nothing to do with Angular,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

but not JavaScript it is,

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

well,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

if we now change something on this array,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

we will change it on the array in this service.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Therefore,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

I will call slice with no arguments.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

This will simply return a new array,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

which is an exact copy of the one in this service file.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

So therefore,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

we really can't access the recipes array stored here from outside.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

We only get a copy.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

So that is a way to get our recipes.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Now with that,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

we can and we have to add our service,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

actually both services.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

to a place in our app to provide them so that we can inject them.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

Where should we provide both services?

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Well,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

let's start with providing the recipe service in

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

our recipe component.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

We can always put it somewhere else later if we recognize

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

that we want access to it from another part in our app.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

But for now,

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

I'll add providers,

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

this array,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

to the recipe component.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Therefore,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

this component and all other recipe -related components,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

since they are all child components to this component in the end,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

will share the same instance of this service,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

but you won't be able to access the service or at least not the same instance in

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

other components like the shopping list component.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

So here in providers,

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

I will...

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

list my recipe service.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Of course,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

you have to add an import at the top telling TypeScript where to find this

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

type. Now with this,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

we can use our recipe service here.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

Now let's use it in the recipe list component.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

Here right now,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

we already manage our recipe array.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Now,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

I don't want to do that here anymore.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

It will be undefined initially.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

We will get the value here in ngOnInit.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

And for this,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

we need to inject our service.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

Now, we can do this since we just provided it on the parent component.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

So here,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

I will provide my recipe service,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

which is of type recipe service.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

Of course, make sure to import recipe service from the appropriate

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file.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

And this should be private here to use this TypeScript shortcut of

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

instantly assigning a property with the same name.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

In ngon init,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

I can now say this recipes equals this recipe

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

service get recipes.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

And we will get this copy of recipes,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

this copy of that array.

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S… Speaker 1 (121. Managing Recipes in a Recipe Service)

Well,

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

let's see this in action.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

If we save this.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

We should and we do see the same as before.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

The app works just like before because the only thing we changed right now is

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

where and how we manage our array of recipes.

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S… Speaker 2 (121. Managing Recipes in a Recipe Service)

An important first step.

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