wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
baz | baz() | Add parentheses. | Kotlin |
JOIN orders ON users.id = orders.email | JOIN orders ON users.id = orders.email | Correct. | SQL |
$values[42] | if ($values.Count -gt 42) {{ $values[42] }} | Check bounds. | PowerShell |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
'message' + 42 | 'message' + str(42) | Can't add int to string. | Python |
items[48] | if (items.indices.contains(48)) items[48] | Check index. | Kotlin |
for (int i=0; i<88; i++) {{}} | for (int i=0; i<88; i++) {{}} | Correct. | Java |
DELETE FROM items WHERE status=17 | DELETE FROM items WHERE status=17; | Add semicolon. | SQL |
function render() {{ echo 'world'; }} | function render() {{ echo 'world'; }} | Correct. | PHP |
List(68,85,23) | List(68,85,23) | Correct. | Scala |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
String a = 'test'; | String a = "test"; | Double quotes. | Java |
$b = 89; if ($b = 89) {{}} | $b = 89; if ($b == 89) {{}} | Use ==. | PHP |
$items[12] = 5; | if (isset($items[12])) $items[12] = 5; | Check existence. | PHP |
if (data = 75) | if (data == 75) | Use ==. | C++ |
var z int = 'info' | var z string = 'info' | Type mismatch. | Go |
const val = 2; val = 65; | let val = 2; val = 65; | Cannot reassign const. | JavaScript |
print 'value' | print 'value'; | Add semicolon. | Perl |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
#main {{ color: blue; }} | #main {{ color: blue; }} | Correct. | CSS |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
'info' + 68 | 'info' + 68.to_s | Convert int. | Ruby |
{{'value':'result'}} | {{"value":"result"}} | Use double quotes. | JSON |
values[26] | if (length(values) >= 26) values[26] | Check length. | R |
if temp = 62 | if temp == 62 | Use ==. | Ruby |
fn test() -> i32 {{ 94 }} | fn test() -> i32 {{ 94 }} | Correct. | Rust |
println('world') | println("world") | Double quotes. | Scala |
int arr[54]; arr[54]=5; | int arr[54]; if(54<54){{}} else arr[54]=5; | Bounds check. | C++ |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
if (index = 77) {{}} | if (index == 77) {{}} | Use ==. | Kotlin |
val foo = 'world' | val foo = "world" | Double quotes. | Kotlin |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
for i=1,54 do print(i) end | for i=1,54 do print(i) end | Correct. | Lua |
.User {{ color: red; }} | .User {{ color: red; }} | Correct. | CSS |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
switch(index){{ case 19: break; }} | switch(index){{ case 19: break; default: break; }} | Add default case. | Java |
local z = 80 | local z = 80 | Correct. | Lua |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
let x = 21; let x = 10; | let x = 21; x = 10; | Duplicate declaration. | JavaScript |
INSERT INTO products VALUES ('info',92) | INSERT INTO products (name, role) VALUES ('info',92); | Specify columns. | SQL |
var x int | var x int | Correct. | Go |
let foo = 'value' | let foo = "value" | Double quotes. | Swift |
let val: number = 'data'; | let val: string = 'data'; | Fix type. | TypeScript |
data(51) | if length(data) >= 51, data(51), end | Check length. | MATLAB |
class Person {{ int foo; }}
obj.foo=5; | class Person {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
if (val = 48) | if (val == 48) | Use ==. | Scala |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
h1 {{ font-size:26px color:blue; }} | h1 {{ font-size:26px; color:blue; }} | Add semicolon. | CSS |
function render(item:string){{return item;}} render(77); | function render(item:string){{return item;}} render('message'); | Pass correct type. | TypeScript |
{{"id":"result",}} | {{"id":"result"}} | Remove trailing comma. | JSON |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
math.sqrt(33) | import math
math.sqrt(33) | Import module first. | Python |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
var x = 38; | var x = 38; | Correct. | Dart |
val foo = 73; foo = 29 | var foo = 73; foo = 29 | Use var for reassignment. | Scala |
if foo = 78 then
print('output')
end | if foo == 78 then
print('output')
end | Use ==. | Lua |
if ($item = 71) {{}} | if ($item -eq 71) {{}} | Use -eq. | PowerShell |
let result: i32 = "data"; | let result: &str = "data"; | Type mismatch. | Rust |
if y > 36
print('data') | if y > 36:
print('data') | Colon missing after if. | Python |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
def render
puts 'test'
end | def render
puts 'test'
end | Correct. | Ruby |
int bar = 'message'; | String bar = 'message'; | Type mismatch. | Dart |
if ($result = 99) | if ($result == 99) | Use ==. | Perl |
item = 39 | item=39 | No spaces. | Shell |
let list=vec![46,7,8]; let first=&list[0]; list.push(18); | let mut list=vec![46,7,8]; let first=list[0]; list.push(18); | Copy instead of reference. | Rust |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
baz | baz() | Add parentheses. | Swift |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
SELECT * FROM items WHRE status=36; | SELECT * FROM items WHERE status=36; | Fix WHERE. | SQL |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
'message' + 36 | 'message' + 36.to_s | Convert int. | Ruby |
let index: number | null = null; index.toFixed(71); | let index: number | null = null; if(index!==null) index.toFixed(71); | Null check. | TypeScript |
cin >> a; | int a;
cin >> a; | Declare variable. | C++ |
DELETE FROM items WHERE name=36 | DELETE FROM items WHERE name=36; | Add semicolon. | SQL |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if result = 57: | if result == 57: | Use == for comparison. | Python |
for (z in data) | for (z of data) | for...in iterates keys. | JavaScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
const c; | const c = 38; | Initialize const. | JavaScript |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
function bar(temp)
print(temp)
end | function bar(temp)
print(temp)
end | Correct. | Lua |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
if (temp = 36) {{}} | if (temp == 36) {{}} | Use ==. | Java |
'message' + 35 | 'message' + str(35) | Can't add int to string. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
[38, 24, 24 | [38, 24, 24] | Close bracket. | Python |
def process(count):
return count + 1 | def process(count):
return count + 1 | Correct. | Python |
<p>world <b>data</p></b> | <p>world <b>data</b></p> | Nest properly. | HTML |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.