mediumPythoninterning
What will this code print?
a = 256
b = 256
c = 257
d = 257
print(a is b, c is d)3,885 medium coding interview questions
Medium questions combine two ideas: scope plus timing, types plus inference, a method plus the edge case it does not handle.
This is where most real screening rounds sit. If you are preparing for an interview next week, start here.
Expect snippets where the obvious answer is wrong for a reason you can name once you see it.
Medium questions by language
Sample medium questions
Eighteen real medium questions from across the library, code snippet included. The answer options and explanations come after you attempt them.
mediumPythondecorators with arguments
What will this print?
def deco(f):
def wrapper():
return "Decorated " + f()
return wrapper
@deco
def say():
return "Hello"
print(say())mediumPythonlist ops and slicing
What is the output?
print(any([]), all([]))mediumJavaScript== vs equals
What is the result?
parseInt("5px")mediumPythonMRO and C3 linearization
What will this code print?
class A:
def hello(self):
return "A"
class B(A):
def hello(self):
return super().hello() + "B"
print(B().hello())mediumPythonmutable default trap
What will this output?
class A:
val = []
a1 = A()
a2 = A()
a1.val.append(1)
print(a2.val)mediumPythonidentity vs equality
What will this code output?
a = [1, 2, 3]
b = [1, 2, 3]
print(a == b, a is b)mediumJavaScriptlet const var and scope
What does the following code log?
for (var i = 0; i < 3; i++) {
setTimeout(() => console.log(i), 100);
}mediumHTMLcontent models
What does the following HTML create?
<ul>\n <li>Item 1</li>\n <li>Item 2\n <ul>\n <li>Subitem</li>\n </ul>\n </li>\n</ul>mediumPythonshallow vs deep copy
What is the output?
x = [[0]] * 3
x[0][0] = 99
print(x)mediumJavaScriptclosures and memory retention
What will be logged?
for (let i = 0; i < 3; i++) {
setTimeout(() => console.log(i), 100);
}mediumPythonint float bool str
What is the output?
print([] or "Hello")
print("" and "World")mediumJavaScriptprimitives and typeof
What does the following code return?
Number.isNaN("test")mediumJavaScriptarray map filter reduce
What will be the output?
let fruits = ["apple", "banana", "orange"];
let result = fruits.slice(1);
console.log(result);mediumPythonmutable default trap
What is the output of the following code?
def func(a, b=[]):
b.append(a)
return b
print(func(1))
print(func(2))mediumJavaScript== vs equals
What is the result?
async function test() {
return "Hello";
}
console.log(test());mediumHTMLaccessible tables scope caption
What does the following code create?
<table>\n <thead>\n <tr><th>Header</th></tr>\n </thead>\n <tbody>\n <tr><td>Data</td></tr>\n </tbody>\n</table>mediumReact
Order the lifecycle methods of a React class component.
// this has nothing to do with question, it's a test question
const Abc = () => {
const [a, v] = useState("abc");
return (
<div>
new abc
dkkdkd
<span>
Nice working
</span>
</div>
)
}