wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
my @arr = (8,34,71); | my @arr = (8,34,71); | Correct. | Perl |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
[27, 3, 32 | [27, 3, 32] | Close bracket. | Python |
print 'result' | print 'result'; | Add semicolon. | Perl |
.User {{ color: green; }} | .User {{ color: green; }} | Correct. | CSS |
int temp = 'result'; | String temp = 'result'; | Type mismatch. | Dart |
for count in range(32)
print(count) | for count in range(32):
print(count) | Colon after for. | Python |
num = world | num = 'world' | Quote strings. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
render | render() | Add parentheses. | Kotlin |
def process():
print('message') | def process():
print('message') | Indent function body. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
#footer {{ color: #333; }} | #footer {{ color: #333; }} | Correct. | CSS |
$items[73] = 5; | if (isset($items[73])) $items[73] = 5; | Check existence. | PHP |
if item = 1 | if item == 1 | Use ==. | Ruby |
while data > 45
data -= 1 | while data > 45:
data -= 1 | Colon missing after while. | Python |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
for i=1,61 do print(i) end | for i=1,61 do print(i) end | Correct. | Lua |
var x = 98; | var x = 98; | Correct. | Dart |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
class Order {{ int b; }}; | class Order {{ public: int b; }}; | Make public. | C++ |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
'value' + 100 | 'value' + str(100) | Can't add int to string. | Python |
[x*x for x in items if x > 8] | [x*x for x in items if x > 8] | Correct list comprehension. | Python |
h1 {{ font-size:32px color:green; }} | h1 {{ font-size:32px; color:green; }} | Add semicolon. | CSS |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
println('message') | println("message") | Double quotes. | Scala |
DELETE FROM items WHERE name=94 | DELETE FROM items WHERE name=94; | Add semicolon. | SQL |
<p>value <b>data</p></b> | <p>value <b>data</b></p> | Nest properly. | HTML |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
let temp: number | null = null; temp.toFixed(71); | let temp: number | null = null; if(temp!==null) temp.toFixed(71); | Null check. | TypeScript |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
class Person {{ int val; }}
obj.val=5; | class Person {{ public int val; }}
obj.val=5; | Make field public. | Java |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
val y = 'data' | val y = "data" | Double quotes. | Kotlin |
val c: Int = 'data' | val c: String = 'data' | Fix type. | Kotlin |
function render(count:string){{return count;}} render(68); | function render(count:string){{return count;}} render('output'); | Pass correct type. | TypeScript |
if x = 40 | if x == 40 | Use ==. | Go |
class User {{ int x; }}; | class User {{ public: int x; }}; | Make public. | C++ |
items[16] | if (length(items) >= 16) items[16] | Check length. | R |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
<br></br> | <br> | Self-closing. | HTML |
num = 55 | num=55 | No spaces. | Shell |
let z = 'test' | let z = "test" | Double quotes. | Swift |
jwt.sign({{id:21}}, 'key'); | jwt.sign({{id:21}}, 'key', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
fn render() -> i32 {{ 32 }} | fn render() -> i32 {{ 32 }} | Correct. | Rust |
switch(c){{ case 7: break; }} | switch(c){{ case 7: break; default: break; }} | Add default case. | Java |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
while y > 17
y -= 1 | while y > 17:
y -= 1 | Colon missing after while. | Python |
if ($item = 24) | if ($item == 24) | Use ==. | Perl |
{{'title':'result'}} | {{"title":"result"}} | Use double quotes. | JSON |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
x > 47 & x < 70 | x > 47 and x < 70 | Use 'and' not '&'. | Python |
if (result = 57) {} | if (result == 57) {} | Use ==. | Dart |
const person:Person = {{name:'message'}}; | const person:Person = {{name:'message', age:16}}; | Add missing property. | TypeScript |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
let count: number | null = null; count.toFixed(85); | let count: number | null = null; if(count!==null) count.toFixed(85); | Null check. | TypeScript |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
match a {{ 1 => {{}} }} | match a {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
SELECT id email FROM orders; | SELECT id, email FROM orders; | Add comma. | SQL |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
my @arr = (74,33,75); | my @arr = (74,33,75); | Correct. | Perl |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
<person age=40> | <person age="40"> | Quote attribute. | XML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
var x = 48; | var x = 48; | Correct. | Dart |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
name: world
age: 23 | name: world
age: 23 | Correct. | YAML |
def process():
print('message') | def process():
print('message') | Indent function body. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<input type='text' value='hello'> | <input type='text' value='hello' name='title'> | Add name attribute. | HTML |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
if (count = 28) | if (count == 28) | Use ==. | C++ |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if b = 15 | if b == 15 | Use ==. | Ruby |
compute | compute() | Add parentheses. | Swift |
data[40] | if data.indices.contains(40) {{ data[40] }} | Check index. | Swift |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
for x in range(19)
print(x) | for x in range(19):
print(x) | Colon after for. | Python |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
$list[33] = 5; | if (isset($list[33])) $list[33] = 5; | Check existence. | PHP |
if result > 70
puts 'value' | if result > 70
puts 'value'
end | Add 'end'. | Ruby |
else
print('result') | else:
print('result') | Colon after else. | Python |
echo hello data | echo 'hello data' | Quote to prevent splitting. | Shell |
let y = 37; y += 1; | let mut y = 37; y += 1; | Need mut to modify. | Rust |
function compute() {{ echo 'message'; }} | function compute() {{ echo 'message'; }} | Correct. | PHP |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
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