Angular Interview Practice

What is the primary advantage of using one-way data flow in Angular?

1. Increased complexity

2. Better performance and predictability

3. More frequent updates

4. Less maintainability

The correct answer is: Better performance and predictability

The primary advantage of using one-way data flow in Angular is better performance and predictability. One-way data flow means that data travels in a single direction, from the parent component down to the child components. This unidirectional flow makes it easier to understand how data changes affect the application’s state, as any changes to the data must originate from a specific point in the application. Because changes in one component do not directly affect other components, tracking and debugging the interactions becomes simpler. This clarity leads to improvements in performance, as Angular can effectively optimize rendering by minimizing the number of checks it has to perform for updates. Additionally, having a predictable data flow reduces the likelihood of bugs caused by unexpected side effects, which often occur in two-way data binding scenarios where the unpredictability of component interactions can create confusion. The other choices reflect disadvantages or misinterpretations of how data flow should work in Angular, focusing on complexities, updates, and maintainability, which are not the primary concerns when discussing the benefits of one-way data flow.