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151. Frage
A developer needs to implement specific styling for a standard component on a single page of the B2B Commerce store using an Aura template. The component should use the default style on all other pages How should the developer implement the required changes over multiple instances?
Antwort: B
Begründung:
To implement specific styling for a standard component on a single page of the B2B Commerce store using an Aura template, a developer should create a custom theme layout Aura component that imports the custom CSS file and set up the page to use this theme layout. A theme layout is a type of Aura component that defines the header and footer of a page in the storefront. A theme layout can also import custom CSS files from static resources and apply them to the page. A developer can create a custom theme layout Aura component that imports the custom CSS file that contains the specific styling for the standard component and assign it to the page that needs the custom styling. This way, the custom styling will only affect the standard component on that page and not on other pages that use a different theme layout. Using a custom CSS file in a static resource and adding the import using the Edit Head Markup Editor in the Experience Builder is not a valid way to implement specific styling for a standard component on a single page, as it will affect all pages that use the same template. Creating a custom content layout Lightning web component that imports the custom CSS file and setting up the page to use this content layout is not a valid way either, as it will not affect the standard component that is outside of the contentlayout. Using the Override CSR Editor in the Experience Builder and adding the desired CSS to change the styles is not a valid way either, as it will affect all pages that use the same template. Salesforce References: B2B Commerce Developer Guide: Theme Layout Component, B2B Commerce Developer Guide: Content Layout Component, B2B Commerce Developer Guide: Override CSR Editor
152. Frage
Northern Tail Outfitters (NTO) is converting an existing aura component into a Lightning Web Component.
The aura component has the following source code:
What is the equivalent of this code in a Lightning Web Component?
Antwort: D
Begründung:
The equivalent of this code in a Lightning web component is option B. Option B uses the @api decorator to expose firstName as a public property of the Lightning web component and communicate it with other components or services. The @api decorator is a decorator that marks a property or method as public, which means that it can be accessed by other components or services that use or consume this component. The @api decorator also makes the property reactive, which means that it can track changes and update the component accordingly. In option B, firstName is exposed as a public property using the @api decorator and passed to the child element using an attribute. Option A is incorrect because it uses an invalid syntax for exposing firstName as a public property. The @api decorator should be used before the property declaration, not after it. Option C is incorrect because it uses an invalid syntax for exposing firstName as a public property. The @api decorator should be used with parentheses, not without them. Option D is incorrect because it uses an invalid syntax for exposing firstName as a public property. The @api decorator should be used with camel case, not with hyphens. Salesforce References: Lightning Web Components Developer Guide: Communicate with Properties, Lightning Web Components Developer Guide: Decorators
153. Frage
A developer has just deployed a new Lightning Web Component to an authorized org. What should the developer do next to use the new component on apage?
Antwort: D
Begründung:
After deploying a new Lightning Web Component (LWC) to an org, the typical next step to use the component on a page involves navigating to that page, entering the edit mode (usually through App Builder or a similar interface), and then dragging the new component from the components palette onto the desired location on the page. This process is consistent with Salesforce's modular design approach, allowing for easy integration and configuration of components within the Salesforce ecosystem.
154. Frage
Which two blocks of code are needed to implement a custom getter in a Lightning web component?
Antwort: C,D
Begründung:
Explanation
custom getter in a Lightning web component is a JavaScript function that executes logic each time a public property is accessed. A custom getter must start with the keyword get and be followed by a name for the property. A custom getter must also have a corresponding custom setter, which is a function that executes logic each time a public property is assigned a value. A custom setter must start with the keyword set and have the same name as the getter. One of the getter or setter functions must be annotated with @api, which makes the property public and reactive.
Option A and Option D show the correct syntax for defining a custom getter and setter for a public property called name. Option A shows the getter function, which returns the value of a private property called _name.
Option D shows the setter function, which assigns the value of the parameter value to the private property _name. The getter function is annotated with @api, which makes the name property public and reactive.
Option B and Option C are incorrect because they do not follow the syntax for a custom getter and setter.
Option B shows a regular function declaration, not a getter function. Option C shows a regular assignment statement, not a setter function. Neither option uses the @api decorator, which is required for a public property. References:
* Getters and Setters
* Understand getter in Lightning Web component
155. Frage
How should data for Lightning web components be provided?
Antwort: A
Begründung:
Data for Lightning web components should be provided as independent properties that take simpler, primitive values (e.g. String, Number, Boolean, Array). Providing data as independent properties allows the developer to expose data as public or private properties of the Lightning web component and communicate data between components or services. Providing data as simpler, primitive values allows the developer to use data types that are supported by JavaScript and Lightning web components and avoid unnecessary or complex conversions or transformations. Providing data as a few properties that contain sets (objects) of data is not a good way to provide data for Lightning web components, as it can create confusion or inconsistency in data structure and access. Providing data as one property that contains all data in one set (object) is not a good way either, as it can create complexity or inefficiency in data management and manipulation. Providing data as a single property object that contains sets (objects) of data is not a good way either, as it can create redundancy or duplication in data storage and retrieval. Salesforce References: Lightning Web Components Developer Guide: Communicate with Properties, Lightning Web Components Developer Guide: Data Types
156. Frage
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