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Top 50 Julia Interview Questions
Entry Junior Mid Senior Expert
Julia Theoretical Questions
Q1:
What's the advantage of using struct vs mutable struct's composite objects?
struct vs mutable struct's composite objects? Entry
Q2:
How to create an Anonymous Function in Julia?
Entry
Q3:
What's the difference between => and -> operators in Julia?
=> and -> operators in Julia? Junior
Q4:
How to modify the given dataframe?
dataframe? Junior
Q5:
How to get access to a dataframe column?
dataframe column? Junior
Q6:
What are the differences between Zero-dimensional arrays and Scalars in Julia?
Junior
Q7:
How to combine two vectors into a matrix?
Junior
Q8:
When would you use :: vs <: operators in types?
:: vs <: operators in types? Junior
Q9:
What does an exclamation mark (!) mean after the name of a function in Julia?
!) mean after the name of a function in Julia? Junior
Q10:
What does the slat operator (...) do?
...) do? Junior
Q11:
What's the difference between Array and Vector in Julia?
Array and Vector in Julia? Junior
Q12:
When would you use == vs === vs isequal?
== vs === vs isequal? Junior
Q13:
What is the difference between == and === comparison operators in Julia?
== and === comparison operators in Julia? Junior
Q14:
How are Positional Arguments different from Keyword Arguments in Julia functions?
Mid Q15:
What are the pros and cons of defining functions with Untyped Arguments?
Mid Q16:
What's the difference between semijoin and antijoin?
semijoin and antijoin? Mid Q17:
How do you implement Object-Oriented Model in Julia?
Mid Q18:
What's the difference between Hard and Soft scope in Julia?
Mid Q19:
Are there any troubles when using Global Variables in Julia?
Mid Q20:
What does the :: operator do?
:: operator do? Mid Q21:
What is the purpose of do-syntax?
do-syntax? Mid Q22:
What does Type-Stable mean in Julia?
Mid Q23:
What's the difference between Macro vs Functions?
Mid Q24:
How do you ensure that the same concrete type is passed to a function in a parametric method?
Mid Q25:
Can you create a class in Julia?
Mid Q26:
What's the difference between missing, Nothing and NaN in Julia?
missing, Nothing and NaN in Julia? Mid Q27:
What's the difference between Primitive types and Composite types?
Mid Q28:
Why would you a Macro instead of a regular function?
Senior Q29:
What is a symbol in Julia?
Senior Q30:
What's the difference between push!() and append()!?
push!() and append()!? Senior Q31:
What is the difference between ::Type{T} and ::T in a function definition?
::Type{T} and ::T in a function definition? Senior Q32:
What's the difference between Outer and Inner constructor methods in Julia?
Senior Q33:
Why would you use the Ref() function?
Ref() function? Senior Q34:
How do we implement Traits, and how are traits useful?
Expert Q35:
What are Traits? How can you implement it in Julia?
Expert Q36:
Why are Abstract Types useful?
Expert Julia Practical Challenges
Q1:
How to concatenate arrays in Julia?
Junior Q2:
How to remove rows from a DataFrame?
DataFrame? Junior Q3:
How can I obtain the complement of list of indexes in Julia?
Junior Q4:
How to select elements from array in Julia Matching Predicate?
Junior Q5:
How to select a random item from a weighted array in Julia?
Mid Q6:
Challenge: Compute the mean grade of each student
Mid Q7:
Create a function to count all unique character frequency in a string
Mid Q8:
How to check if elements from one vector are within another vector?
Mid Q9:
How to convert an array of array into a matrix in Julia?
Mid Q10:
How to obtain indices of an array that satisfy boolean condition?
Mid Q11:
How to do One-Hot Encoding in Julia?
Mid Q12:
How to create a function in Julia that saves its own internal state?
Mid Q13:
What is the meaning of ! in this code sample? What will be the output?
! in this code sample? What will be the output? Mid Q14:
What is ".==" in Julia? What will be the output of the code snippet?
.==" in Julia? What will be the output of the code snippet? Mid 
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