study-guide | important algorithms and data structures | Learning library
kandi X-RAY | study-guide Summary
kandi X-RAY | study-guide Summary
By now it should be week 14 for those who are reading this guide. This study guide outlines the major data structures and algorithms needed to succeed in technical interviews. The official guide was first written by Haseeb Qureshi, titled How To Break Into The Tech Industry - a Guide to Job Hunting and Interviews on his personal blog site. This guide focuses on implementation details of the materials. However, please read Haseeb's guide at least once and follow his advice.
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Lines of Code : 38License : Permissive (MIT License)
Copydef main():
x = 1
x_add_two = x + 2
# This condition is obviously true
ran_1 = False
if x_add_two == 3: # skip: else
ran_1 = True # run
assert ran_1 is True
# A negated condition can also be true
ran_2 = Fa def main():
# Running `search` with "Hello" has a match for first Hello
assert re.search(r"Hello", _TEXT_HELLO).start() == 6
# Running `search` with "Hello$" has a match for last Hello
assert re.search(r"Hello$", _TEXT_HELLO).start() def sum_until(fn, n):
"""Sum function results from 0 until n - 1.
This expects a function to be provided as its first input and an integer
as its second input. Like `add`, `sum_until` returns a value.
The fact that a function can be Community Discussions
Trending Discussions on study-guide
QUESTION
I a writing a shipping plugin for WooCommerce, and when I try to get the values of a protected key ([key:protected]) it returns empty. How do we get the value of a protected key from an array or an object?
Specifically, in the calculate_shipping function of the woocommerce_shipping_init it passes in $package, which is an array which also contains some objects, and some of the object keys are protected. So $package looks something like this (this is a simplified version):
...ANSWER
Answered 2020-Feb-02 at 23:16Protected properties cannot be accessed from outside of the object's internal context, much like private properties. What differentiates protected and private properties, however, is that an extending object may view the parent's protected properties, but not the private properties.
If you must access the protected properties directly for whatever reason, then extend the target object and provide a getter method:
QUESTION
I am getting ready to take my Spring Certification v5.0 and there appears to be a question: Do you use Spring in a unit test? Link to Exam Guide questions.
From Spring reference guide I know this:
The POJOs that make up your application should be testable in JUnit or TestNG tests, with objects simply instantiated using the new operator, without Spring or any other container.
From my study as well I can tell that we only are using Spring when testing controllers (like below), repositories or when creating integration tests and maybe some other cases. We would need the TestContext in these cases which is part of org.springframework.* package.
@RunWith(SpringRunner.class)
@WebMvcTest(HelloWorldController.class)
So, is the correct answer of this question: No we do not use Spring? or that, Yes we do need it. Because we obviously use it in some cases.
...ANSWER
Answered 2018-May-15 at 13:35The first paragraph you mentioned is the answer to your question, you don't need Spring to write unit tests for the classes you wrote, even when they're Spring beans.
The other cases you mentioned aren't really unit tests. When testing a repository using SpringRunner and a mock database, you're no longer writing a unit test, but an integration test. The same applies to writing tests for your controller using MockMvc. In both cases you're testing the integration between the Spring framework (Spring MVC or Spring Data) with your code (and a database).
However, you can write unit tests for your controller, but in that case, you would rather do something like this:
QUESTION
I'm almost taking the Java SE 8 Programmer I exam (1Z0-808). I'm using this study guide: https://www.selikoff.net/java-oca-8-programmer-i-study-guide/. When answering the review questions in chapter 5 (Class Design) i failed at this question:
Which of the following is true about a concrete subclass? (Choose all that apply)
- A concrete subclass can be declared as abstract.
- A concrete subclass must implement all inherited abstract methods.
- A concrete subclass must implement all methods defined in an inherited interface.
- A concrete subclass cannot be marked as final.
- Abstract methods cannot be overridden by a concrete subclass.
My answers were 2 and 5. But only the 2nd was correct. I selected the 5th answer because i thought that it is true you cannot override an abstract method from an abstract class, but you can implement it, like inferfaces, which are almost like abstract classes since Java 8.
Knowing that interfaces abstract methods are implemented, not overriden, when talking about abstract classes: is it correct to say "Abstract methods can be overriden by a concrete subclass" instead of "Abstract methods can be implemented by a concrete subclass"?
If we pay attention to the second answer (which is the right one) they used the word "implement".
...ANSWER
Answered 2017-Jul-01 at 02:12This is how the specification uses this terminology:
If a non-
abstractmethodmCoverrides an abstract methodmAfrom a classC, thenmCis said to implementmAfromC.An instance method
mCdeclared in or inherited by classC, overrides fromCanother methodmIdeclared in an interfaceI, iff all of the following are true: [...]
Note that it does use the term "overrides" in reference to overriding interface methods.
In more plain terms, if a method overrides an abstract method (either from an abstract class or interface), then the overriding method implements the abstract method. It's still considered an override, though.
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