23) Explain what is Map Reduce?
Map-reduce is a framework to process large data sets, splitting them into subsets, processing each subset on a different server and then blending results obtained on each.
11) Mention what are the missing patterns that are generally observed?
The missing patterns that are generally observed are
12) Explain what is KNN imputation method?
In KNN imputation, the missing attribute values are imputed by using the attributes value that are most similar to the attribute whose values are missing. By using a distance function, the similarity of two attributes is determined.
3 What is the abbreviation of ARC?
ARC stands for Automatic Reference Counting.
3 Explain the lazy property in Swift?
A lazy stored property is one that does not determine its initial value until it is used for the first time. The lazy modifier is written before the declaration of a lazy stored property.
1 What is GCD?
The GCD stands for Grand Central Dispatch. It is a low-level API that allows you to manage multiple concurrent operations. It will assist you in increasing the responsiveness of your app by deferring computationally intensive tasks to the context. It’s a simpler concurrency model than locks and threads to deal with.
2 Explain a singleton class.
When only one instance of a class is created in the application, that class is called a singleton class. See below:
29) What are hash table collisions? How is it avoided?
A hash table collision happens when two different keys hash to the same value. Two data cannot be stored in the same slot in array.
To avoid hash table collision there are many techniques, here we list out two
It uses the data structure to store multiple items that hash to the same slot.
It searches for other slots using a second function and store item in first empty slot that is found
Which are the top 5 skills you need to become a data architect?
Here are the essential competences every data architect must demonstrate:
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Advanced Interview Questions
Top Answers to iOS Interview Questions
Below are the three categories into which this iOS Interview Questions and Answers blog is divided: 1. Basic
25) What are some of the statistical methods that are useful for data-analyst?
Statistical methods that are useful for data scientist are