Senior Software Professional Interview Questions and Answers

Closure nested comparison with Dispatch group

• Use closures to handle asynchronous tasks in Swift

• Nested closures can be used for sequential tasks

• Dispatch groups can be used to wait for multiple asynchronous tasks to complete

Differ block is used in programming to execute a block of code based on a condition.

• Differ block is similar to if-else statements in programming.

• It allows the execution of different blocks of code based on different conditions.

• Example: if(condition1) { // code block 1 } else if(condition2) { // code block 2 } else { // default code block }

Optimizing SQL queries involves using indexes, avoiding unnecessary joins, and optimizing the query structure.

• Use indexes on columns frequently used in WHERE clauses

• Avoid using SELECT * and only retrieve necessary columns

• Minimize the use of functions in WHERE clauses

• Optimize joins by using INNER JOIN instead of OUTER JOIN when possible

• Consider denormalizing data for frequently accessed queries

The life cycle of an app refers to the stages it goes through from development to deployment and maintenance.

• 1. Planning and requirements gathering

• 2. Design and development

• 3. Testing and quality assurance

• 4. Deployment and release

• 5. Maintenance and updates