Q61. How does the CAP theorem affect microservice design?
CAP states that during a network partition a distributed system must choose between consistency (every read sees the latest write) and availability (every request gets a ...
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Q62. 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...
Q63. What is Simpson paradox?
Simpson's paradox is when a trend appears in several groups but reverses or disappears when the groups are combined. It happens because a confounding variable is unevenly...
Q64. What are the conditional directives?
VueJS provides set of directives to show or hide elements based on conditions. The available directives are: **v-if, v-else, v-else-if and v-show** **1. v-if:** The v-if ...
Q65. What is the difference between v-show and v-if directives?
Below are some of the main differences between **v-show** and **v-if** directives, 1. v-if only renders the element to the DOM if the expression passes whereas v-show ren...
Q66. What is Dict and List comprehensions are?
**List and Dictionary comprehensions** provide a concise, declarative syntax to construct new lists and dictionaries from existing iterables: ### 1. List Comprehension: S...
Q67. What is the purpose of v-for directive?
The built-in v-for directive allows us to loop through items in an array or object. You can iterate on each element in the array or object. 1. **Array usage:** ```javascr...
Q68. Why should not use if and for directives together on the same element?
It is recommended not to use v-if on the same element as v-for. Because v-if directive has a higher priority than v-for. There are two cases where developers try to use t...
Q69. Why do you need to use key attribute on for directive?
In order to track each node's identity, and thus reuse and reorder existing elements, you need to provide a unique `key` attribute for each item with in `v-for` iteration...
Q70. How do you use v-for directive with a range?
You can also use integer type(say 'n') for `v-for` directive which repeats the element many times. ```javascript {{ n }} ``` It displays the number 1 to 20. ****