Javascript Framework Interview Questions
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Michael Zippo
04.11.2021
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If you’re into web development, you’ve probably heard of Angular. This framework is currently a hot topic: Forbes, Indiegogo, and Delta Airlines all use Angular for their sites. Today, there are many career opportunities in web applications that require a good working knowledge of Angular.
As a result, you may run into questions during the interview to make sure you have the Angular Intelligence you say you have. We’ve put together a list of Angular Interview FAQs to help you hone your understanding of Angular and improve your next interview.
What is Angular ?
Angular is an open source TypeScript framework and is a complete rewrite of AngularJS (a JavaScript framework). A framework is a skeleton on which to rely; it’s almost a full web page that requires a bit of setup and customization to make it work. It works other than a JavaScript library , which is just a set of features.
Angular is also the A in the widely used MEAN stack, which includes MongoDB, Express.js, Angular application, and Node.js.
Angular interview questions
Q: Which architecture uses Angular ?
A: Angular uses the Model View Controller (MVC) architecture.
Q: What does each aspect of MVC represent in Angular ?
A: In Angular:
- The model, the main data structure, is Angular itself.
- The view is what is displayed on the client side, written in HTML.
- The controller is the logic that responds to input and executes the model, written in JavaScript.
Q: What is dependency injection ?
A: Dependency injection is a design method Angular uses to determine how properly components are dependent to use.
Q: What is two-way data binding ?
A: Two-way data binding indicates that the model and view influence each other, as opposed to one-way binding where the model affects the view and not the other way around.
D: What is ng-content ?
A: The ng-content directive is used for content projection, where a value can be supplied later to corner. It is very useful for creating reusable components.
Q: What are Angular services ?
A: Angular services are singleton objects that remain active for the duration of the program. They typically provide logic or controller services and can be called from any component.
Q: How is application data related to HTML ?
A: You do this with Angular expressions, which are snippets of code in an association with double braces.
D: What is string interpolation ? h4>
A: String interpolation is a single syntax that uses double braces. The code inside is executed by Angular and the output is displayed as HTML. This is also called the mustache syntax.
Q: How are promises and observables different ?
A: Observables handle a flow of events and are not executed unless a subscription is made. The promises organize a single event on site.
Q: What is a supplier ?
A: A provider is a special service that can be configured. It provides a way for the dependency injection system to find the required values.
D: What is an annotation ?
A: The annotations come from Traceur and create an "annotation" table . A: Decorators come from TypeScript and are functions that get a decorated object and make changes to it.
Q: What are Angular directives ?
A: Directives are used for DOM manipulation. They can be used to bind behaviors or transform DOM elements. Angular directives start with " ng- " and some of the most popular are listed here:
- Ng-controller, which connects the controller to the view.
- Ng-content, which is used for content projection.
- Ng-model, a directive used for two-way data binding.
- Ng-bind, which binds the properties of the model and the results of ng-model.
- Ng-app, which initializes Angular
D: What is Angular Material?
A: Material is a library of UI Components that allow Angular to use material design.
Q: What is AOT ?
A: The AOT is for compiler anticipation. This mean s that Angular compiles the code before anything is needed, but not all once.
Q: What are the different filters used in Angular ?
A: Angular supports the following filters:
- Filter - Get a subset of elements from an array.
- Currency - Format numbers as currency.
- Date - Format numbers as a date.
- Restrict - Place a limit on an array or string.
- Uppercase - Creates an all lowercase string.
- Upper Case - Creates an all upper case string.
- Number - Formats a number as a string.
- Sort by - Rearranges an array with an expression.
- Json - Formats an object into a JSON string
Q: What is the difference between TypeScript and JavaScript ?
A: TypeScript is a superset of JavaScript. TypeScript is just JavaScript with the input (and a few other things). JavaScript is fully compatible with TypeScript, and TypeScript is compiled into JavaScript.
Q: What is the summary loop ?
A: The summary loop is triggered when a value in the model or view is changed in angular. It usually runs automatically and uses observers to keep the same data between the model and the view. If a change is made outside of Angular, it must be done manually.
Q: If you use or ?
A: The tag should be used if you are using Angular 6 or higher, while should be used for older versions of Angular.
Q: What does REST mean ?
A: REST stands for REpresental State Transfer.
Conclusion
Although this list of questions is not complete, we hope it served as an update to prepare you for your next one. the most important concepts of Angular, although for the smallest details that may be needed, you may need to rely on your knowledge of Angular.
If you don’t know If you don’t already know Angular, now is the best time to learn. Take advantage of the large number of opportunities available to learn and enter the web development industry, such as a programming bootcamp.
👻 Read also: what is the best laptop for engineering students?
Javascript Framework Interview Questions __del__: Questions
How can I make a time delay in Python?
5 answers
I would like to know how to put a time delay in a Python script.
2973
Answer #1
import time
time.sleep(5) # Delays for 5 seconds. You can also use a float value.
Here is another example where something is run approximately once a minute:
import time
while True:
print("This prints once a minute.")
time.sleep(60) # Delay for 1 minute (60 seconds).
Javascript Framework Interview Questions __del__: Questions
How to delete a file or folder in Python?
5 answers
How do I delete a file or folder in Python?
2639
Answer #1
Path objects from the Python 3.4+ pathlib module also expose these instance methods:
Removing white space around a saved image in matplotlib
2 answers
I need to take an image and save it after some process. The figure looks fine when I display it, but after saving the figure, I got some white space around the saved image. I have tried the "tight" option for savefig method, did not work either. The code:
import matplotlib.image as mpimg
import matplotlib.pyplot as plt
fig = plt.figure(1)
img = mpimg.imread(path)
plt.imshow(img)
ax=fig.add_subplot(1,1,1)
extent = ax.get_window_extent().transformed(fig.dpi_scale_trans.inverted())
plt.savefig("1.png", bbox_inches=extent)
plt.axis("off")
plt.show()
I am trying to draw a basic graph by using NetworkX on a figure and save it. I realized that without a graph it works, but when added a graph I get white space around the saved image;
import matplotlib.image as mpimg
import matplotlib.pyplot as plt
import networkx as nx
G = nx.Graph()
G.add_node(1)
G.add_node(2)
G.add_node(3)
G.add_edge(1,3)
G.add_edge(1,2)
pos = {1:[100,120], 2:[200,300], 3:[50,75]}
fig = plt.figure(1)
img = mpimg.imread("image.jpg")
plt.imshow(img)
ax=fig.add_subplot(1,1,1)
nx.draw(G, pos=pos)
extent = ax.get_window_extent().transformed(fig.dpi_scale_trans.inverted())
plt.savefig("1.png", bbox_inches = extent)
plt.axis("off")
plt.show()
228
Answer #2
I cannot claim I know exactly why or how my “solution” works, but this is what I had to do when I wanted to plot the outline of a couple of aerofoil sections — without white margins — to a PDF file.
(Note that I used matplotlib inside an IPython notebook, with the -pylab flag.)
plt.gca().set_axis_off()
plt.subplots_adjust(top = 1, bottom = 0, right = 1, left = 0,
hspace = 0, wspace = 0)
plt.margins(0,0)
plt.gca().xaxis.set_major_locator(plt.NullLocator())
plt.gca().yaxis.set_major_locator(plt.NullLocator())
plt.savefig("filename.pdf", bbox_inches = "tight",
pad_inches = 0)
I have tried to deactivate different parts of this, but this always lead to a white margin somewhere. You may even have modify this to keep fat lines near the limits of the figure from being shaved by the lack of margins.
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