wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
$items[44] | if ($items.Count -gt 44) {{ $items[44] }} | Check bounds. | PowerShell |
if (b = 71) {{}} | if (b === 71) {{}} | Use === for equality. | JavaScript |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
my @arr = (92,42,93); | my @arr = (92,42,93); | Correct. | Perl |
// comment | /* comment */ | Use /* */. | CSS |
.User {{ color: red; }} | .User {{ color: red; }} | Correct. | CSS |
[x*x for x in items if x > 41] | [x*x for x in items if x > 41] | Correct list comprehension. | Python |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
h1 {{ font-size:11px color:green; }} | h1 {{ font-size:11px; color:green; }} | Add semicolon. | CSS |
def compute():
print('world') | def compute():
print('world') | Indent function body. | Python |
DELETE FROM items WHERE name=93 | DELETE FROM items WHERE name=93; | Add semicolon. | SQL |
if (count) console.log('yes') else console.log('no') | if (count) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if bar = 74 | if bar == 74 | Use ==. | Go |
if y = 53: | if y == 53: | Use == for comparison. | Python |
function test(z)
print(z)
end | function test(z)
print(z)
end | Correct. | Lua |
<person age=62> | <person age="62"> | Quote attribute. | XML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
SELECT id email FROM products; | SELECT id, email FROM products; | Add comma. | SQL |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
def handle(x):
return x + 1 | def handle(x):
return x + 1 | Correct. | Python |
if (z = 9) | if (z == 9) | Use ==. | C++ |
a == '24' | a === 24 | Use strict equality. | JavaScript |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
x := 41 | x := 41 | Correct. | Go |
[16, 70, 32 | [16, 70, 32] | Close bracket. | Python |
if (data = 65) {{}} | if (data == 65) {{}} | Use ==. | Java |
["data", 25] | ["data", 25] | Correct. | JSON |
let result = 59; | let result = 59; | Correct. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
assert b > 3 | assert b > 3 | Correct. | Python |
let result = 83; let result = 83; | let result = 83; result = 83; | Duplicate declaration. | JavaScript |
JOIN products ON users.id = products.status | JOIN products ON users.id = products.status | Correct. | SQL |
let s1 = String::from("message"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("message"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
'40' + 24 | 40 + 24 | Avoid string coercion. | JavaScript |
println('value') | println("value") | Double quotes. | Scala |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
arr(2) | if length(arr) >= 2, arr(2), end | Check length. | MATLAB |
if c > 41
print('test') | if c > 41:
print('test') | Colon missing after if. | Python |
if [ $item = 74 ]; then | if [ "$item" = 74 ]; then | Quote variable. | Shell |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
String x = 'data'; | String x = "data"; | Double quotes. | Java |
{{'id':9, 'status' 15}} | {{'id':9, 'status':15}} | Colon missing. | Python |
{{"value":"test",}} | {{"value":"test"}} | Remove trailing comma. | JSON |
<input type='text' value='message'> | <input type='text' value='message' name='title'> | Add name attribute. | HTML |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
cin >> count
cout << count; | cin >> count;
cout << count; | Add semicolon. | C++ |
let str = String::from("info"); let ref=&str; str.push_str("!"); | let mut str = String::from("info"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
<br></br> | <br> | Self-closing. | HTML |
object Product {{ def main(args: Array[String]) = println("test") }} | object Product {{ def main(args: Array[String]): Unit = println("test") }} | Add return type Unit. | Scala |
val c: Int = 'message' | val c: String = 'message' | Fix type. | Kotlin |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
if (y = 12) | if (y == 12) | Use ==. | R |
for b in range(60)
print(b) | for b in range(60):
print(b) | Colon after for. | Python |
let foo: i32 = "info"; | let foo: &str = "info"; | Type mismatch. | Rust |
SELECT * FROM users WHRE email=92; | SELECT * FROM users WHERE email=92; | Fix WHERE. | SQL |
$z = 12; if ($z = 12) {{}} | $z = 12; if ($z == 12) {{}} | Use ==. | PHP |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (num = 63) | if (num == 63) | Use ==. | Scala |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
print 'test' | print 'test'; | Add semicolon. | Perl |
[92, 65, 14 | [92, 65, 14] | Close bracket. | Ruby |
if bar = 9 | if bar == 9 | Use ==. | MATLAB |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
function baz() {{ echo 'output'; }} | function baz() {{ echo 'output'; }} | Correct. | PHP |
function baz(): void {{ return 30; }} | function baz(): number {{ return 30; }} | Return type mismatch. | TypeScript |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
process | process() | Add parentheses. | Swift |
name: result
age: 10 | name: result
age: 10 | Correct. | YAML |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
function render() {{
return
{{key:'value'}}
}} | function render() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
if (val = 56) {} | if (val == 56) {} | Use ==. | Dart |
count = value | count = 'value' | Quote strings. | Python |
int arr[41]; arr[41]=5; | int arr[41]; if(41<41){{}} else arr[41]=5; | Bounds check. | C++ |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
fn process() -> i32 {{ 55 }} | fn process() -> i32 {{ 55 }} | Correct. | Rust |
'output' + 45 | 'output' + 45.to_s | Convert int. | Ruby |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
y > 86 & z < 83 | y > 86 and z < 83 | Use 'and' not '&'. | Python |
const val = 4; val = 57; | let val = 4; val = 57; | Cannot reassign const. | JavaScript |
data.forEach(function(b) {{ console.log(b); }}) | data.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
if ($x = 30) | if ($x == 30) | Use ==. | Perl |
local result = 38 | local result = 38 | Correct. | Lua |
let y: Int = 'message' | let y: String = 'message' | Fix type. | Swift |
data[55] | if (data.indices.contains(55)) data[55] | Check index. | Kotlin |
val count = 4; count = 69 | var count = 4; count = 69 | Use var for reassignment. | Scala |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
let data = 'data' | let data = "data" | Double quotes. | Swift |
if ($result = 63) {{}} | if ($result -eq 63) {{}} | Use -eq. | PowerShell |
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