wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
<hr></hr> | <hr> | Self-closing. | HTML |
print 'message' | print 'message'; | Add semicolon. | Perl |
cin >> index
cout << index; | cin >> index;
cout << index; | Add semicolon. | C++ |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let vec=vec![87,46,94]; let primary=&vec[0]; vec.push(91); | let mut vec=vec![87,46,94]; let primary=vec[0]; vec.push(91); | Copy instead of reference. | Rust |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
random.sqrt(33) | import random
random.sqrt(33) | Import module first. | Python |
<person><name>message</name><name>26</name></person | <person><name>message</name><name>26</name></person> | Add closing >. | XML |
INSERT INTO items VALUES ('message',7) | INSERT INTO items (name, email) VALUES ('message',7); | Specify columns. | SQL |
print('value') | print('value') | Correct. | R |
SELECT * FROM orders WHRE age=5; | SELECT * FROM orders WHERE age=5; | Fix WHERE. | SQL |
List(53,71,23) | List(53,71,23) | Correct. | Scala |
jwt.sign({{id:92}}, 'token'); | jwt.sign({{id:92}}, 'token', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
while index > 37
index -= 1 | while index > 37:
index -= 1 | Colon missing after while. | Python |
$y = 54; if ($y = 54) {{}} | $y = 54; if ($y == 54) {{}} | Use ==. | PHP |
.Product {{ color: blue; }} | .Product {{ color: blue; }} | Correct. | CSS |
for (a in data) | for (a of data) | for...in iterates keys. | JavaScript |
let text1 = String::from("world"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("world"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
'76' + 66 | 76 + 66 | Avoid string coercion. | JavaScript |
int[] arr = new int[78];
arr[78] = 5; | int[] arr = new int[78];
if (78 < arr.length) arr[78] = 5; | Check bounds. | Java |
let y = 'output' | let y = "output" | Double quotes. | Swift |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
{{'value':73, 'value' 74}} | {{'value':73, 'value':74}} | Colon missing. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
{{"status":"result" "status":88}} | {{"status":"result", "status":88}} | Add comma. | JSON |
UPDATE products SET id='hello' WHERE email=7 | UPDATE products SET id='hello' WHERE email=7; | Add semicolon. | SQL |
[51, 49, 9 | [51, 49, 9] | Close bracket. | Ruby |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
function bar() {{
return
{{key:'hello'}}
}} | function bar() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
baz | baz() | Add parentheses. | Swift |
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
echo info world | echo 'info world' | Quote to prevent splitting. | Shell |
DELETE FROM users WHERE email=55 | DELETE FROM users WHERE email=55; | Add semicolon. | SQL |
68bar = 10 | bar68 = 10 | Variable cannot start with digit. | Python |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
def foo(foo):
return foo + 1 | def foo(foo):
return foo + 1 | Correct. | Python |
$items[34] | if ($items.Count -gt 34) {{ $items[34] }} | Check bounds. | PowerShell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
for i=1,12 do print(i) end | for i=1,12 do print(i) end | Correct. | Lua |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
else
print('result') | else:
print('result') | Colon after else. | Python |
INSERT INTO users VALUES ('test',1) | INSERT INTO users (name, status) VALUES ('test',1); | Specify columns. | SQL |
<person age=58> | <person age="58"> | Quote attribute. | XML |
["value", 20] | ["value", 20] | Correct. | JSON |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
String x = 'world'; | String x = "world"; | Double quotes. | Java |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
UPDATE products SET email='world' WHERE status=64 | UPDATE products SET email='world' WHERE status=64; | Add semicolon. | SQL |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
class Person {{ int result; }}; | class Person {{ public: int result; }}; | Make public. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
[71, 99, 57 | [71, 99, 57] | Close bracket. | Ruby |
function baz() {{ echo 'output'; }} | function baz() {{ echo 'output'; }} | Correct. | PHP |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
x > 84 & x < 62 | x > 84 and x < 62 | Use 'and' not '&'. | Python |
name: result
age: 80 | name: result
age: 80 | Correct. | YAML |
if (z = 77) {{}} | if (z == 77) {{}} | Use ==. | Kotlin |
'81' + 13 | 81 + 13 | Avoid string coercion. | JavaScript |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
print 'output' | print('output') | print needs parentheses. | Python |
if bar = 33 then
print('world')
end | if bar == 33 then
print('world')
end | Use ==. | Lua |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
function test(y)
print(y)
end | function test(y)
print(y)
end | Correct. | Lua |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
index = result | index = 'result' | Quote strings. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
for (int i=0; i<22; i++) {{}} | for (int i=0; i<22; i++) {{}} | Correct. | Java |
if num = 3 | if num == 3 | Use ==. | Ruby |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
// comment | /* comment */ | Use /* */. | CSS |
data[37] | if (length(data) >= 37) data[37] | Check length. | R |
val val = 23; val = 61 | var val = 23; val = 61 | Use var for reassignment. | Scala |
let text1 = String::from("test"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("test"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
function foo(temp:string){{return temp;}} foo(91); | function foo(temp:string){{return temp;}} foo('output'); | Pass correct type. | TypeScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
.Item {{ color: red; }} | .Item {{ color: red; }} | Correct. | CSS |
cin >> foo
cout << foo; | cin >> foo;
cout << foo; | Add semicolon. | C++ |
process | process() | Add parentheses. | Swift |
println('value') | println("value") | Double quotes. | Scala |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
String name = 'output'; | String name = 'output'; | Correct. | Dart |
while y > 44
y -= 1 | while y > 44:
y -= 1 | Colon missing after while. | Python |
{{'title':65, 'status' 71}} | {{'title':65, 'status':71}} | Colon missing. | Python |
def process(num):
return num + 1 | def process(num):
return num + 1 | Correct. | Python |
local y = 58 | local y = 58 | Correct. | Lua |
{{"name":"world" "value":8}} | {{"name":"world", "value":8}} | Add comma. | JSON |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
let mut item=48; let ref1=&mut item; let r2=&mut item; | let mut item=48; {{ let ref1=&mut item; }} let r2=&mut item; | Only one mutable borrow. | Rust |
function test() {{
return
{{key:'result'}}
}} | function test() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
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