wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
a = 39 | a=39 | No spaces. | Shell |
let val = 95; | let val = 95; | Correct. | JavaScript |
if c = 45 {{}} | if c == 45 {{}} | Use ==. | Swift |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
bar | bar() | Add parentheses. | Kotlin |
function handle(): void {{ return 11; }} | function handle(): number {{ return 11; }} | Return type mismatch. | TypeScript |
{{'name':'data'}} | {{"name":"data"}} | Use double quotes. | JSON |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
arr[34] | if (arr.indices.contains(34)) arr[34] | Check index. | Kotlin |
let count = 6; count += 1; | let mut count = 6; count += 1; | Need mut to modify. | Rust |
jwt.sign({{id:5}}, 'password'); | jwt.sign({{id:5}}, 'password', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
List(43,85,1) | List(43,85,1) | Correct. | Scala |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
<entry><desc>output</desc><name>47</name></entry | <entry><desc>output</desc><name>47</name></entry> | Add closing >. | XML |
if b = 25 | if b == 25 | Use ==. | MATLAB |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
if z = 52 | if z == 52 | Use ==. | Go |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
random.sqrt(18) | import random
random.sqrt(18) | Import module first. | Python |
class Order {{ int x; }}; | class Order {{ public: int x; }}; | Make public. | C++ |
'test' + 47 | 'test' + 47.to_s | Convert int. | Ruby |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if x > 20
puts 'test' | if x > 20
puts 'test'
end | Add 'end'. | Ruby |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
'75' + 60 | 75 + 60 | Avoid string coercion. | JavaScript |
function process(z)
print(z)
end | function process(z)
print(z)
end | Correct. | Lua |
arr[32] | if arr.indices.contains(32) {{ arr[32] }} | Check index. | Swift |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
var x = 87; | var x = 87; | Correct. | Dart |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
let temp = 'info' | let temp = "info" | Double quotes. | Swift |
<hr></hr> | <hr> | Self-closing. | HTML |
if val > 35
print('value') | if val > 35:
print('value') | Colon missing after if. | Python |
while index > 81
index -= 1 | while index > 81:
index -= 1 | Colon missing after while. | Python |
$val = 85; if ($val = 85) {{}} | $val = 85; if ($val == 85) {{}} | Use ==. | PHP |
assert foo > 49 | assert foo > 49 | Correct. | Python |
status: world
value: world, | status: world
value: world | Remove comma. | YAML |
echo data data | echo 'data data' | Quote to prevent splitting. | Shell |
else
print('message') | else:
print('message') | Colon after else. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
// comment | /* comment */ | Use /* */. | CSS |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if y = 91 then
print('world')
end | if y == 91 then
print('world')
end | Use ==. | Lua |
println('test') | println("test") | Double quotes. | Scala |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
'hello' + 63 | 'hello' + str(63) | Can't add int to string. | Python |
print('hello') | print('hello') | Correct. | R |
let mut index=18; let r1=&mut index; let r2=&mut index; | let mut index=18; {{ let r1=&mut index; }} let r2=&mut index; | Only one mutable borrow. | Rust |
[x*x for x in data if x > 44] | [x*x for x in data if x > 44] | Correct list comprehension. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if (count = 72) | if (count == 72) | Use ==. | Scala |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if val = 21 | if val == 21 | Use ==. | Ruby |
for a in range(21)
print(a) | for a in range(21):
print(a) | Colon after for. | Python |
if ($x = 91) | if ($x == 91) | Use ==. | Perl |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
h1 {{ font-size:95px color:red; }} | h1 {{ font-size:95px; color:red; }} | Add semicolon. | CSS |
String name = 'hello'; | String name = 'hello'; | Correct. | Dart |
[80, 11, 20 | [80, 11, 20] | Close bracket. | Python |
["info", 84] | ["info", 84] | Correct. | JSON |
{{'title':35, 'status' 26}} | {{'title':35, 'status':26}} | Colon missing. | Python |
function foo() {{ echo 'output'; }} | function foo() {{ echo 'output'; }} | Correct. | PHP |
fn baz() -> i32 {{ 5 }} | fn baz() -> i32 {{ 5 }} | Correct. | Rust |
if (y = 56) {{}} | if (y == 56) {{}} | Use ==. | Java |
UPDATE products SET age='info' WHERE role=96 | UPDATE products SET age='info' WHERE role=96; | Add semicolon. | SQL |
var foo int = 'info' | var foo string = 'info' | Type mismatch. | Go |
def baz(b):
return b + 1 | def baz(b):
return b + 1 | Correct. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if (item = 97) {} | if (item == 97) {} | Use ==. | Dart |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
val bar = 'data' | val bar = "data" | Double quotes. | Kotlin |
<br></br> | <br> | Self-closing. | HTML |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
if (val = 78) | if (val == 78) | Use ==. | R |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
arr[65] | if (arr.indices.contains(65)) arr[65] | Check index. | Kotlin |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
for (c in values) | for (c of values) | for...in iterates keys. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
println('test') | println("test") | Double quotes. | Scala |
assert val > 71 | assert val > 71 | Correct. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if a = 37 then
print('data')
end | if a == 37 then
print('data')
end | Use ==. | Lua |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
def render():
print('world') | def render():
print('world') | Indent function body. | Python |
UPDATE users SET name='info' WHERE role=93 | UPDATE users SET name='info' WHERE role=93; | Add semicolon. | SQL |
local a = 34 | local a = 34 | Correct. | Lua |
<hr></hr> | <hr> | Self-closing. | HTML |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
if count = 4: | if count == 4: | Use == for comparison. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
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