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FULL STACK JUNIOR

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Given the following array of integers, sort it in ascending order using the quick sort algorithm

Input: arr = [5, 3, 7, 1, 9, 2]

Output: [1, 2, 3, 5, 7, 9]

None

Given the following password check if it meets the following requirements:

It has at least 6 characters.
It contains at least one digit.
It contains at least one lowercase character.
It contains at least one uppercase character.
Contains at least one special character. Special characters are: !@#$%^&*()-+

Returns the number of characters that must be added for the password to meet all requirements.

Input: n = 11 password = “#HackerRank”.

Output: 1

Explanation: The password meets all requirements except 1 has no digits.

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Given the following SOS string, certain letters are altered and do not give the SOS message, return the number of SOS letters that have been altered.

Input: s = “SOSSPSSQSSOR”.

Output: 3

Explanation: In some SOS of the string there is a letter that has been modified which are “P, Q, R” so there are 3 letters that modified the SOS.

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SQL clause used to filter the records in a table based on a specific condition.

GROUP BY

WHERE

SET

INNER JOIN

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Given the following array of integers sort them in descending order.

Input: arr = [10, 5, 2, 8, 7, 1, 9, 6, 3, 4]

Output: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1]

None

Given the following array and an integer, return the indices of 2 numbers that sum to the given integer.

Input: nums = [2,7,11,15] target = 9

Output: [0,1]

Explanation: The sum of position 0 and 1 of the array return as result 9. 2 + 7 = 9

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What is the difference between a class and an object in OOP?

The class is a template for the object.

A class is a blueprint or template that defines the structure and behavior of objects, while an object is a concrete instance of that class.

An object is the methods of the class.

An object is the template that defines methods and attributes and the class is the instance.

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Reverses the following string.

Input: “Hello World”.

Output: “dlroW olleH”.

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What is the SQL query to select all records in a table named "customers"?

SELECT * FROM customers WHERE id = 1

SELECT FROM customers

SELECT * FROM customers

SELECT name FROM customers

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10.

Given the following array of integers, returns the smaller number.

Input: arr = [23,456,89,1,34]

Output: 1

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11.

Given an array of integers, returns a new array with unique elements eliminating duplicates.

Input: arr = [23,4,5,7,4,23,8]

Output: [23, 4, 5, 7, 8]

None

12.

What type of SQL queries are used to interact with data stored in a database, allowing operations such as inserting, updating and deleting data in tables?

DDL

UML

DML

DCL

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13.

What is the pillar of object-oriented programming that promotes code reuse?

Polymorphism

Inheritance

Abstraction

Encapsulation

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14.

Given two arrays, one with the exchange rates between two currencies and one with the amounts in the original currency, return an array with the amounts converted to the final currency.

Input: rates = [1.15, 0.85] currencies = [100, 200]

Output: [115, 170]

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15.

What is inheritance in object-oriented programming and what is its purpose?

It allows a class to inherit properties and methods from another class, which encourages code reuse and the creation of class hierarchies

It allows the attributes and methods of a class to be protected.

Allows classes to inherit responsibilities from another class.

It allows overwriting methods from one class to another.

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16.

What is the function of the constructor method in OOP?

It has the main function of initializing an object when an instance of a class is created and it is called automatically when we instantiate the class.

It has the function of assigning static values of an object that will never change.

It allows to destroy the object when the class is instantiated.

It has the function of overwriting a method of another class.

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17.

What is polymorphism in OOP?

Polymorphism allows working only the most relevant part of a class.

Polymorphism allows the actions of an object to be hidden.

Polymorphism is the inheritance between parent and child classes.

Polymorphism allows objects of different classes to respond uniformly to the same interface, which facilitates the creation of more flexible and extensible code.

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18.

What is an interface in object-oriented programming?

It is a contract that defines a set of methods that a class must implement, without providing a concrete implementation of those methods.

It is a contract that defines attributes and methods of a class that it must implement.

It is a class that cannot be instantiated.

It is a template describing what the concrete object will do.

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19.

What is a relational database?

It is a type of database that organizes data in tables related to specific fields and uses primary and foreign keys to establish relationships between them.

It is a set of data that is stored in a non-tabular form.

It is a database that allows redundant data.

It is a database that organizes data in JSON.

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20.

Given an array of countries and another array with capitals returns a new array with country-capital pairs.

Input: countries = [“Mexico”, “Spain”, “United States”]

capitals = [“Ciudad de México”, “Madrid”, “Washington D.C.”]

Output:

[ [ ‘Mexico’, ‘Ciudad de México’ ], [ ‘Spain’, ‘Madrid’ ], [ ‘United States’, ‘Washington D.C.’ ] ]

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