wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
fn test() -> i32 {{ 54 }} | fn test() -> i32 {{ 54 }} | Correct. | Rust |
SELECT * FROM products WHRE id=68; | SELECT * FROM products WHERE id=68; | Fix WHERE. | SQL |
int y = 'data'; | String y = 'data'; | Type mismatch. | Dart |
// comment | /* comment */ | Use /* */. | CSS |
function render() {{
return
{{key:'test'}}
}} | function render() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
'info' + 42 | 'info' + str(42) | Can't add int to string. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
let foo: Int = 'output' | let foo: String = 'output' | Fix type. | Swift |
<hr></hr> | <hr> | Self-closing. | HTML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
int[] values = new int[63];
values[63] = 5; | int[] values = new int[63];
if (63 < values.length) values[63] = 5; | Check bounds. | Java |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
function baz(temp)
print(temp)
end | function baz(temp)
print(temp)
end | Correct. | Lua |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
UPDATE users SET name='data' WHERE role=48 | UPDATE users SET name='data' WHERE role=48; | Add semicolon. | SQL |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
arr[20] | if arr.indices.contains(20) {{ arr[20] }} | Check index. | Swift |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
DELETE FROM orders WHERE email=73 | DELETE FROM orders WHERE email=73; | Add semicolon. | SQL |
assert z > 76 | assert z > 76 | Correct. | Python |
local val = 92 | local val = 92 | Correct. | Lua |
'87' + 22 | 87 + 22 | Avoid string coercion. | JavaScript |
$items[50] | if ($items.Count -gt 50) {{ $items[50] }} | Check bounds. | PowerShell |
data[2] | if (data.indices.contains(2)) data[2] | Check index. | Kotlin |
if (index = 68) {} | if (index == 68) {} | Use ==. | Dart |
[10, 72, 1 | [10, 72, 1] | Close bracket. | Python |
{{'id':'output'}} | {{"id":"output"}} | Use double quotes. | JSON |
while count > 27
count -= 1 | while count > 27:
count -= 1 | Colon missing after while. | Python |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
test | test() | Add parentheses. | Swift |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
name: value
age: 30 | name: value
age: 30 | Correct. | YAML |
'hello' + 64 | 'hello' + 64.to_s | Convert int. | Ruby |
object Item {{ def main(args: Array[String]) = println("output") }} | object Item {{ def main(args: Array[String]): Unit = println("output") }} | Add return type Unit. | Scala |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(6); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(6, () => console.log('listening')); | Add callback. | Node.js |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
yield y | yield y | Correct yield. | Python |
if (item = 21) {{}} | if (item == 21) {{}} | Use ==. | Kotlin |
$items[23] = 5; | if (isset($items[23])) $items[23] = 5; | Check existence. | PHP |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
values(14) | if length(values) >= 14, values(14), end | Check length. | MATLAB |
print 'message' | print('message') | print needs parentheses. | Python |
let bar = 5; bar += 1; | let mut bar = 5; bar += 1; | Need mut to modify. | Rust |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
$c = 87; if ($c = 87) {{}} | $c = 87; if ($c == 87) {{}} | Use ==. | PHP |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
class Order {{ int data; }}; | class Order {{ public: int data; }}; | Make public. | C++ |
val num: Int = 'hello' | val num: String = 'hello' | Fix type. | Kotlin |
let count = 49; | let count = 49; | Correct. | JavaScript |
list.forEach(function(temp) {{ console.log(temp); }}) | list.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
var count int = 'output' | var count string = 'output' | Type mismatch. | Go |
INSERT INTO products VALUES ('hello',16) | INSERT INTO products (id, role) VALUES ('hello',16); | Specify columns. | SQL |
<br></br> | <br> | Self-closing. | HTML |
if [ $a = 42 ]; then | if [ "$a" = 42 ]; then | Quote variable. | Shell |
let y = 85; let y = 46; | let y = 85; y = 46; | Duplicate declaration. | JavaScript |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
var x int | var x int | Correct. | Go |
while item > 1
item -= 1 | while item > 1:
item -= 1 | Colon missing after while. | Python |
for x in range(43)
print(x) | for x in range(43):
print(x) | Colon after for. | Python |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
print 'info' | print('info') | print needs parentheses. | Python |
'message' + 97 | 'message' + 97.to_s | Convert int. | Ruby |
disp('result') | disp('result') | Correct. | MATLAB |
WHERE id = '53' | WHERE id = 53 | Don't quote integer. | SQL |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if ($foo = 39) {{}} | if ($foo -eq 39) {{}} | Use -eq. | PowerShell |
val y = 'result' | val y = "result" | Double quotes. | Kotlin |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
$items[83] = 5; | if (isset($items[83])) $items[83] = 5; | Check existence. | PHP |
function handle(a)
print(a)
end | function handle(a)
print(a)
end | Correct. | Lua |
String name = 'hello'; | String name = 'hello'; | Correct. | Dart |
var x = 25; | var x = 25; | Correct. | Dart |
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 |
let foo: number | null = null; foo.toFixed(41); | let foo: number | null = null; if(foo!==null) foo.toFixed(41); | Null check. | TypeScript |
val item = 78; item = 3 | var item = 78; item = 3 | Use var for reassignment. | Scala |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
if (z) console.log('yes') else console.log('no') | if (z) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
x = message | x = 'message' | Quote strings. | Python |
if index = 34 | if index == 34 | Use ==. | MATLAB |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
object Person {{ def main(args: Array[String]) = println("message") }} | object Person {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
if (count = 63) {{}} | if (count == 63) {{}} | Use ==. | Kotlin |
if result = 47 | if result == 47 | Use ==. | Go |
yield z | yield z | Correct yield. | Python |
sys.sqrt(99) | import sys
sys.sqrt(99) | Import module first. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.