TCS iON Senior Software Developer Interview Questions and Answers

Q1. What is lifecycle hook of Angular
Ans. 
Lifecycle hooks in Angular are methods that allow you to tap into the lifecycle of a component or directive.
• Lifecycle hooks include ngOnInit, ngOnChanges, ngDoCheck, ngOnDestroy, etc.

• ngOnInit is used to initialize data in a component after Angular has initialized the component.

• ngOnChanges is called when the input properties of a component change.

• ngDoCheck is used for detecting and acting on changes that Angular doesn't...read more
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Q1. Why functional interface when we have interface
Ans. 
Functional interfaces provide a single abstract method for functional programming in Java.
• Functional interfaces allow for lambda expressions and method references to be used as instances of the interface.

• Interfaces with multiple abstract methods cannot be used for lambda expressions.

• Example: java.util.function.Function is a functional interface with a single abstract method apply().
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Q2. Java 8 explain all features in short
Ans. 
Java 8 introduced new features like lambda expressions, streams, functional interfaces, and default methods.
• Lambda expressions: Allows writing concise code by enabling functional programming.

• Streams: Provides a way to work with sequences of elements efficiently.

• Functional interfaces: Interfaces with a single abstract method, used for lambda expressions.

• Default methods: Allows adding new methods to interfaces without br
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Q3. If one functional interface can extend another interface
Ans. 
Yes, one functional interface can extend another interface in Java.
• Functional interfaces can extend other functional interfaces in Java.

• The child interface can have only one abstract method, but can inherit default methods from the parent interface.

• Example: interface Parent { void method1(); } interface Child extends Parent { void method2(); }
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Q1. Array based basic easy level questions
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Q2. Reverse an array
Ans. 
Reverse an array of strings
• Use a loop to iterate through half of the array

• Swap the elements at the corresponding positions from both ends

• Continue swapping until the middle of the array is reached
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Q3. Find the second largest element in an array
Ans. 
Find the second largest element in an array
• Sort the array in descending order and return the element at index 1

• Iterate through the array and keep track of the largest and second largest elements

• Use a priority queue to find the second largest element
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Q1. Past Experience
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Q1. No of divisions in cobol?
Ans. 
There are four divisions in COBOL: Identification Division, Environment Division, Data Division, and Procedure Division.
• Identification Division: Contains program name, author, and date.

• Environment Division: Specifies the hardware and software environment.

• Data Division: Defines the data structures used in the program.

• Procedure Division: Contains the actual program logic.
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Q2. What is GDG in JCL?
Ans. 
GDG stands for Generation Data Group in JCL, used to manage related datasets as a single unit.
• GDG is used in JCL to group related datasets together for easier management.

• It allows for easy referencing of datasets within the group using relative generation numbers.

• Example: MYDATA.GDG(+1) refers to the most recent generation in the GDG.

• Example: MYDATA.GDG(-1) refers to the previous generation in the GDG.
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Q1. Javascript basics, class and functional components, basic es6
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Q1. Promises, context api, redux and rest API
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