Johnson Controls Angular Developer Interview Questions and Answers

Q1. What is directive
Ans. 
A directive in Angular is a marker on a DOM element that tells Angular's HTML compiler to attach a specified behavior to that DOM element or transform the DOM element and its children.
• Directives are used to create reusable components or add behavior to existing elements.

• There are three types of directives in Angular: Component, Structural, and Attribute directives.

• Examples of directives include ngIf, ngFor, and ngStyle
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Q2. What is data binding
Ans. 
Data binding is the automatic synchronization of data between the model and view components in an Angular application.
• Data binding allows for the communication between the component class and its template.

• There are four types of data binding in Angular: Interpolation, Property binding, Event binding, and Two-way binding.

• Example: {{ title }} in HTML template binds the value of 'title' property from the component class.
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Q1. Can you explain the difference between a stack and a queue and provide a real-world example where each would be used.
Ans. 
A stack is a Last In First Out (LIFO) data structure, while a queue is a First In First Out (FIFO) data structure.
• Stack: LIFO - Last In First Out. Example: browser history where the last page visited is the first to be accessed.

• Queue: FIFO - First In First Out. Example: a line at a grocery store where the first person in line is the first to be served.
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Q2. Given an array of integers, write a function to find the two numbers that add up to a specific target. How would you optimize this solution?
Ans. 
Function to find two numbers in array that add up to target. Optimize solution.
• Use a hash map to store each number and its index as you iterate through the array.

• For each number, check if the difference between the target and the number exists in the hash map.

• Return the indices of the two numbers that add up to the target.
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Easy coding exercise with test cases

Q1. More about coding exercise
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Q2. Work experience
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