Vue.js is a progressive JavaScript framework that has gained immense popularity for its simplicity and flexibility in building user interfaces. With its elegant design and ease of integration into projects, Vue.js allows developers to create interactive and dynamic web applications. Vue.js follows a component-based architecture, making it easy to develop and maintain complex applications. Whether you're building single-page applications (SPAs), progressive web apps (PWAs), or incorporating Vue.js into existing projects, it empowers you to craft responsive and feature-rich user experiences with ease and efficiency.
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Practice Test
61. What are computed properties in Vue used for?
A. To store data properties
B. To perform asynchronous tasks
C. To cache and compute derived data
D. To watch for changes in data
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Answer: To cache and compute derived data
62. How do you define a computed property in a Vue component?
A. Using the computed option
B. Using the methods option
C. Using the data option
D. Using the props option
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Answer: Using the computed option
63. In Vue, when are computed properties recalculated?
A. Whenever a method is called
B. Whenever a data property changes
C. When the component is created
D. When explicitly triggered
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Answer: Whenever a data property changes
64. What is the main advantage of using computed properties in Vue?
A. They improve code organization
B. They provide real-time updates
C. They prevent data mutation
D. They are easier to define
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Answer: They improve code organization
65. What happens when a computed property depends on a data property that changes?
A. The computed property is updated
B. An error is thrown
C. The data property is deleted
D. The computed property is ignored
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Answer: The computed property is updated
66. What is the primary use case for using watchers in Vue?
A. To perform complex calculations
B. To cache frequently used data
C. To monitor changes in data
D. To define methods in a component
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Answer: To monitor changes in data
67. How do you define a watcher in a Vue component?
A. Using the watch option
B. Using the computed option
C. Using the methods option
D. Using the data option
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Answer: Using the watch option
68. What is the difference between a computed property and a watcher in Vue?
A. Computed properties are asynchronous
B. Watchers are used for data mutation
C. Computed properties are cached
D. Watchers can return new values
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Answer: Computed properties are cached
69. In Vue, when does a watcher function get executed?
A. When a computed property changes
B. When a data property changes
C. When explicitly triggered
D. When the component is created
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Answer: When a data property changes
70. What is the primary role of the immediate option in a Vue watcher?
A. To execute the watcher immediately
B. To delay the watcher execution
C. To watch for changes in data
D. To cancel the watcher
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Answer: To execute the watcher immediately
