Elancer It Solutions Interview Questions and Answers

Semantic tags in HTML are specific tags that provide meaning to the content they enclose.

• Semantic tags help search engines and screen readers understand the structure of a webpage.

• Examples of semantic tags include <header>, <footer>, <nav>, <article>, <section>, <aside>, <main>, <figure>, <figcaption>.

• Using semantic tags improves SEO and accessibility of a website.

Currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of nested functions, each taking a single argument.

• Currying helps in creating reusable functions and partial application.

• It allows you to create new functions by fixing some parameters of an existing function.

• Example: const add = (a) => (b) => a + b; add(2)(3) will return 5.

Map is used to transform each element of an array, while Filter is used to select elements based on a condition.

• Map returns a new array with the same length as the original array, but with each element transformed based on a provided function.

• Filter returns a new array with only the elements that pass a provided condition function.

• Example for Map: [1, 2, 3].map(num => num * 2) will result in [2, 4, 6].

• Example for Fi...read more

Map creates a new array with the results of calling a provided function on every element, while forEach executes a provided function once for each array element.

• Map returns a new array with the same length as the original array, while forEach does not return anything.

• Map does not mutate the original array, while forEach can mutate the original array.

• Map is more suitable for transforming data and creating a new array, w...read more

Authentication verifies the identity of a user, while authorization determines the user's access rights.

• Authentication confirms the user's identity through credentials like username and password.

• Authorization determines what actions the authenticated user is allowed to perform.

• Authentication precedes authorization in the security process.

• Example: Logging into a website (authentication) and then accessing specific pages

Local storage persists even after the browser is closed, while session storage is cleared when the browser is closed.

• Local storage has no expiration date, while session storage expires when the browser is closed.

• Local storage stores data with no limit, while session storage has a limit of around 5MB.

• Local storage data is available across all windows/tabs for that domain, while session storage data is only available wit...read more

Correlation is the process of extracting dynamic values from server responses and passing them to subsequent requests. Parameterization is the process of replacing hard-coded values in scripts with variables.

• Correlation involves identifying and capturing dynamic values like session IDs or tokens from server responses.

• Parameterization involves replacing hard-coded values in scripts with variables to make them reusable a...read more

Load testing is to test the system under normal and peak load conditions, stress testing is to test the system beyond its limits, and all testing is a combination of both.

• Load testing checks the system's ability to handle expected load levels, ensuring performance under normal conditions.

• Stress testing pushes the system beyond its limits to identify breaking points and measure performance degradation.

• All testing combin...read more

PTLC stands for Performance Testing Life Cycle, which is a set of activities involved in the performance testing process.

• PTLC involves planning, preparation, execution, analysis, and reporting of performance tests.

• It includes defining performance goals, creating test scenarios, setting up test environments, running tests, analyzing results, and making recommendations.

• Example: In PTLC, performance engineers work closely...read more

Issues faced in Loadrunner scripting, execution, and reports

• Scripting: faced issues with correlation, parameterization, and dynamic data handling

• Execution: encountered problems with test environment setup, resource constraints, and test data management

• Reports: struggled with result analysis, performance bottlenecks identification, and report customization

LG calculation and workload modelling process involves determining the number of Load Generators required and creating a realistic simulation of user behavior.

• Calculate the number of Load Generators needed based on expected user load and performance goals.

• Create workload models by analyzing user behavior patterns, transaction volumes, and system usage.

• Consider factors like peak load times, user distribution, and transa...read more

NFR scenarios refer to non-functional requirements that define the quality attributes of a system.

• NFR scenarios focus on aspects like performance, scalability, reliability, and security.

• Examples include load testing to assess system performance under expected load, stress testing to evaluate system behavior under extreme conditions, and security testing to identify vulnerabilities.

• NFR scenarios help ensure that the sys...read more