Q61. How would you scale a relational database as traffic grows?
Scaling relational databases follows a progression, because a single node eventually hits CPU, memory or I/O limits. 1. Optimise first: fix queries, add indexes, tune the...
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Q62. How would you refactor a god class into a maintainable design?
A god class is large, does many unrelated things, has many dependencies and is touched by most changes. Treat the refactor as a series of safe, behaviour-preserving steps...
Q63. What is a metric tree and why does metric definition governance matter?
A metric tree decomposes a top-level business goal into the drivers that influence it. For example, revenue equals active customers times purchase frequency times average...
Q64. What is the transactional outbox pattern and why is it needed?
A service often must both change its database and publish an event. Writing to the database and then to the broker is a dual write: a crash between the two loses the even...
Q65. What are HTML ARIA attributes and how are they used?
| Attribute | Description | Example | | ------------------ | -------------------------------------------------------------------------------------------------------------...
Q66. What are variables in SASS?
Variables in Sass (SCSS) store reusable styling values (colors, spacing units, fonts) identified by a dollar sign (**`$`**) prefix: ```scss // Definition $primary-blue: #...
Q67. How do you use CSS variables to create more flexible and dynamic designs, and what are some use cases where variables are particularly useful?
CSS variables can improve maintainability and reduce repetition. Variables are particularly useful for theming, creating responsive designs, and making changes to global ...
Q68. Can you explain the concept of instance variables in a class in JavaScript?
In JavaScript, instance variables are properties of an object that are specific to an instance of a class. When we create a new instance of a class using the `new` keywor...
Q69. What does the variable environment in JavaScript's function execution context contain, and what is its purpose?
The variable environment contains all the variables, function declarations, and function arguments specific to that function. It keeps track of the function's local varia...
Q70. What is variable shadowing in JavaScript?
If there is a variable in the global scope, and you'd like to create a variable with the same name in a function. The variable in the inner scope will temporarily shadow ...