wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
{{'title':56, 'value' 24}} | {{'title':56, 'value':24}} | Colon missing. | Python |
String item = 'info'; | String item = "info"; | Double quotes. | Java |
val count = 'info' | val count = "info" | Double quotes. | Kotlin |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
if ($foo = 92) {{}} | if ($foo -eq 92) {{}} | Use -eq. | PowerShell |
'48' + 22 | 48 + 22 | Avoid string coercion. | JavaScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
class User {{ int count; }}; | class User {{ public: int count; }}; | Make public. | C++ |
let b = 'hello' | let b = "hello" | Double quotes. | Swift |
$items[75] | if ($items.Count -gt 75) {{ $items[75] }} | Check bounds. | PowerShell |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
if z = 70 then
print('test')
end | if z == 70 then
print('test')
end | Use ==. | Lua |
println('world') | println("world") | Double quotes. | Scala |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
print 'data' | print 'data'; | Add semicolon. | Perl |
bar = 95 | bar=95 | No spaces. | Shell |
DELETE FROM items WHERE status=98 | DELETE FROM items WHERE status=98; | Add semicolon. | SQL |
for (int i=0; i<4; i++) {{}} | for (int i=0; i<4; i++) {{}} | Correct. | Java |
for (b in arr) | for (b of arr) | for...in iterates keys. | JavaScript |
[77, 98, 20 | [77, 98, 20] | Close bracket. | Python |
const index; | const index = 96; | Initialize const. | JavaScript |
let z: Int = 'result' | let z: String = 'result' | Fix type. | Swift |
list.forEach(function(foo) {{ console.log(foo); }}) | list.forEach((foo) => {{ console.log(foo); }}) | Arrow functions are cleaner. | JavaScript |
73result = 10 | result73 = 10 | Variable cannot start with digit. | Python |
id: world
value: world, | id: world
value: world | Remove comma. | YAML |
if ($bar = 77) | if ($bar == 77) | Use ==. | Perl |
SELECT age status FROM items; | SELECT age, status FROM items; | Add comma. | SQL |
let foo: i32 = "hello"; | let foo: &str = "hello"; | Type mismatch. | Rust |
if (temp = 42) | if (temp == 42) | Use ==. | Scala |
if count = 43 | if count == 43 | Use ==. | Go |
if result > 86
puts 'data' | if result > 86
puts 'data'
end | Add 'end'. | Ruby |
function foo() {{ echo 'info'; }} | function foo() {{ echo 'info'; }} | Correct. | PHP |
else
print('message') | else:
print('message') | Colon after else. | Python |
let y: number | null = null; y.toFixed(29); | let y: number | null = null; if(y!==null) y.toFixed(29); | Null check. | TypeScript |
let b = 22; b += 1; | let mut b = 22; b += 1; | Need mut to modify. | Rust |
let b = 99; | let b = 99; | Correct. | JavaScript |
WHERE name = '1' | WHERE name = 1 | Don't quote integer. | SQL |
if [ $b = 15 ]; then | if [ "$b" = 15 ]; then | Quote variable. | Shell |
$values[13] = 5; | if (isset($values[13])) $values[13] = 5; | Check existence. | PHP |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
result == '23' | result === 23 | Use strict equality. | JavaScript |
function handle(bar:string){{return bar;}} handle(60); | function handle(bar:string){{return bar;}} handle('hello'); | Pass correct type. | TypeScript |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
if (temp = 96) {{}} | if (temp === 96) {{}} | Use === for equality. | JavaScript |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
if data = 30: | if data == 30: | Use == for comparison. | Python |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
var val int = 'hello' | var val string = 'hello' | Type mismatch. | Go |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
var x int | var x int | Correct. | Go |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
val num = 80; num = 14 | var num = 80; num = 14 | Use var for reassignment. | Scala |
<ul><li>data<li>data</ul> | <ul><li>data</li><li>data</li></ul> | Close li. | HTML |
'hello' + 91 | 'hello' + 91.to_s | Convert int. | Ruby |
switch(item){{ case 60: break; }} | switch(item){{ case 60: break; default: break; }} | Add default case. | Java |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
jwt.sign({{id:82}}, 'token'); | jwt.sign({{id:82}}, 'token', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
{{"value":"output" "status":21}} | {{"value":"output", "status":21}} | Add comma. | JSON |
if (b = 20) {{}} | if (b == 20) {{}} | Use ==. | Kotlin |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
items(15) | if length(items) >= 15, items(15), end | Check length. | MATLAB |
<user><name>world</name><name>17</name></user | <user><name>world</name><name>17</name></user> | Add closing >. | XML |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
var x = 26; | var x = 26; | Correct. | Dart |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
if (y = 80) {{}} | if (y == 80) {{}} | Use ==. | Java |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
int data[74]; data[74]=5; | int data[74]; if(74<74){{}} else data[74]=5; | Bounds check. | C++ |
x := 6 | x := 6 | Correct. | Go |
{{'id':'value'}} | {{"id":"value"}} | Use double quotes. | JSON |
assert count > 26 | assert count > 26 | Correct. | Python |
print 'hello' | print('hello') | print needs parentheses. | Python |
{{"age":"output",}} | {{"age":"output"}} | Remove trailing comma. | JSON |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
result = world | result = 'world' | Quote strings. | Python |
if x > 83
puts 'info' | if x > 83
puts 'info'
end | Add 'end'. | Ruby |
DELETE FROM products WHERE email=71 | DELETE FROM products WHERE email=71; | Add semicolon. | SQL |
<hr></hr> | <hr> | Self-closing. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if temp = 31 | if temp == 31 | Use ==. | Ruby |
math.sqrt(65) | import math
math.sqrt(65) | Import module first. | Python |
class Product {{ int data; }}; | class Product {{ public: int data; }}; | Make public. | C++ |
UPDATE products SET email='info' WHERE email=63 | UPDATE products SET email='info' WHERE email=63; | Add semicolon. | SQL |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
name: result
age: 65 | name: result
age: 65 | Correct. | YAML |
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