The ultimate guide to data science interviews. Developed by FAANG engineers, it covers Python, algorithms, ML concepts, and interview questions. Get interview-ready in just a few hours.

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This course will increase your skills to crack the data science or machine learning interview. You will cover all the most common data science and ML concepts coupled with relevant interview questions.
You will start by covering Python basics as well as the most widely used algorithms and data structures. From there, you will move on to more advanced topics like feature engineering, unsupervised learning, as well as neural networks and deep learning.
This course takes a non-traditional approach to interview prep, in that it focuses on data science fundamentals instead of open-ended questions.

In all, this course will get you ready for data science interviews. By the time you finish this course, you will have reviewed all the major concepts in data science and will have a good idea of what interview questions you can expect.

Data Science Interview Handbook

<h2> What is an array? </h2>

<li> An array is a contiguous area of memory. 
<li>This contiguous area contains elements of equal size. 
<li>These elements are indexed by contiguous integers. 

In different languages, arrays are indexed differently. In some languages, array indexing starts at 1. In others, it starts at 0. In Python, array indexing starts at 0.

Arrays provide constant-time access to read and write any item in an array. This is possible because of the properties of the array. Each element of the array is of the same size. So, by taking the address of the first element, we can get the address of the $i^{th}$ element by using a calculation.




<b>i<sup>th</sup> index element address = array first element address + size of elements * (i – first index of array) </b>

The above calculation is just to help you understand the concept. We don’t need to perform it at runtime. We directly access the element, and the calculation happens internally. 


We have an array of first element addresses as 2020. The size of the element is 16, and the first index is 0. What is the address of the 6th element?


<p>We have an array of first element addresses as 2020. The size of the element is 16, and the first index is 0. What is the address of the 6th element?</p>


Quiz: Understanding array address calculation

<p>Quiz: Understanding array address calculation</p>


Explanation: The correct answer is $2100$. Since our array is starting from index $0$, the $6th$ element address,  will appear at index $5$. So, putting our values into the formula:


Address = $2020 + 16* (5-0) = 2100$


Learn about arrays, an essential part of your  programming toolbox.


Are You Ready to Become a Data Scientist?

Python Basics

Python Libraries

More Data Science Tools

Data Structures and Algorithms - I

Data Structures and Algorithms - II

Statistics and Probability

Feature Engineering

Basics of Machine Learning

Regression

Classification

Unsupervised Learning

Advanced Topics in Machine Learning

Conclusion

Array

What is an array?