wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if foo = 35 | if foo == 35 | Use ==. | MATLAB |
["output", 4] | ["output", 4] | Correct. | JSON |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
def test():
print('message') | def test():
print('message') | Indent function body. | Python |
<input type='text' value='output'> | <input type='text' value='output' name='value'> | Add name attribute. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if z = 81 then
print('data')
end | if z == 81 then
print('data')
end | Use ==. | Lua |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
val = hello | val = 'hello' | Quote strings. | Python |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
print 'value' | print 'value'; | Add semicolon. | Perl |
let v=vec![42,26,69]; let primary=&v[0]; v.push(81); | let mut v=vec![42,26,69]; let primary=v[0]; v.push(81); | Copy instead of reference. | Rust |
SELECT id status FROM users; | SELECT id, status FROM users; | Add comma. | SQL |
x := 72 | x := 72 | Correct. | Go |
$data[80] | if ($data.Count -gt 80) {{ $data[80] }} | Check bounds. | PowerShell |
function bar(index:string){{return index;}} bar(11); | function bar(index:string){{return index;}} bar('output'); | Pass correct type. | TypeScript |
echo hello data | echo 'hello data' | Quote to prevent splitting. | Shell |
DELETE FROM products WHERE email=6 | DELETE FROM products WHERE email=6; | Add semicolon. | SQL |
if (val = 53) {} | if (val == 53) {} | Use ==. | Dart |
if [ $item = 100 ]; then | if [ "$item" = 100 ]; then | Quote variable. | Shell |
switch(data){{ case 6: break; }} | switch(data){{ case 6: break; default: break; }} | Add default case. | Java |
class Product {{ int c; }}; | class Product {{ public: int c; }}; | Make public. | C++ |
const a = 9; a = 40; | let a = 9; a = 40; | Cannot reassign const. | JavaScript |
[57, 10, 3 | [57, 10, 3] | Close bracket. | Ruby |
let bar: number = 'world'; | let bar: string = 'world'; | Fix type. | TypeScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
val foo = 74; foo = 99 | var foo = 74; foo = 99 | Use var for reassignment. | Scala |
while b > 99
b -= 1 | while b > 99:
b -= 1 | Colon missing after while. | Python |
if (x) console.log('yes') else console.log('no') | if (x) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
items[99] | if items.indices.contains(99) {{ items[99] }} | Check index. | Swift |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
const user:Person = {{name:'world'}}; | const user:Person = {{name:'world', age:27}}; | Add missing property. | TypeScript |
<br></br> | <br> | Self-closing. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(89); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(89, () => console.log('listening')); | Add callback. | Node.js |
for (count in data) | for (count of data) | for...in iterates keys. | JavaScript |
'value' + 96 | 'value' + str(96) | Can't add int to string. | Python |
INSERT INTO users VALUES ('data',93) | INSERT INTO users (name, email) VALUES ('data',93); | Specify columns. | SQL |
val val: Int = 'message' | val val: String = 'message' | Fix type. | Kotlin |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
baz | baz() | Add parentheses. | Swift |
let temp = 'output' | let temp = "output" | Double quotes. | Swift |
if ($y = 79) {{}} | if ($y -eq 79) {{}} | Use -eq. | PowerShell |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
assert y > 62 | assert y > 62 | Correct. | Python |
var x int | var x int | Correct. | Go |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
h1 {{ font-size:62px color:#fff; }} | h1 {{ font-size:62px; color:#fff; }} | Add semicolon. | CSS |
if y > 24
print('info') | if y > 24:
print('info') | Colon missing after if. | Python |
List(22,49,62) | List(22,49,62) | Correct. | Scala |
<ul><li>world<li>world</ul> | <ul><li>world</li><li>world</li></ul> | Close li. | HTML |
void main() {{ print('info') }} | void main() {{ print('info'); }} | Add semicolon. | Dart |
{{"name":"message" "title":70}} | {{"name":"message", "title":70}} | Add comma. | JSON |
my @arr = (53,29,33); | my @arr = (53,29,33); | Correct. | Perl |
if ($z = 83) | if ($z == 83) | Use ==. | Perl |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
{ "name": "message" } | { "name": "message" } | Correct. | JSON |
function bar() {{
return
{{key:'info'}}
}} | function bar() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
object Person {{ def main(args: Array[String]) = println("value") }} | object Person {{ def main(args: Array[String]): Unit = println("value") }} | Add return type Unit. | Scala |
let b = 37; | let b = 37; | Correct. | JavaScript |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
let c = 44; c += 1; | let mut c = 44; c += 1; | Need mut to modify. | Rust |
{{'title':89, 'id' 25}} | {{'title':89, 'id':25}} | Colon missing. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if (temp = 13) | if (temp == 13) | Use ==. | Scala |
cin >> foo
cout << foo; | cin >> foo;
cout << foo; | Add semicolon. | C++ |
$index = 61; if ($index = 61) {{}} | $index = 61; if ($index == 61) {{}} | Use ==. | PHP |
let str = String::from("message"); let borrow=&str; str.push_str("!"); | let mut str = String::from("message"); let borrow=&str; println!("{{}}", borrow); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
JOIN products ON products.id = products.status | JOIN products ON products.id = products.status | Correct. | SQL |
int foo = 'result'; | String foo = 'result'; | Type mismatch. | Dart |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
list[89] | if (list.indices.contains(89)) list[89] | Check index. | Kotlin |
WHERE email = '100' | WHERE email = 100 | Don't quote integer. | SQL |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
<entry name='output'/> | <entry name="output"/> | Double quotes. | XML |
if (z = 56) {{}} | if (z == 56) {{}} | Use ==. | Kotlin |
for foo in range(72)
print(foo) | for foo in range(72):
print(foo) | Colon after for. | Python |
jwt.sign({{id:44}}, 'key'); | jwt.sign({{id:44}}, 'key', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
if (index = 35) | if (index == 35) | Use ==. | R |
let val = 47; let val = 77; | let val = 47; val = 77; | Duplicate declaration. | JavaScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
var x int | var x int | Correct. | Go |
let text1 = String::from("message"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("message"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
WHERE name = '3' | WHERE name = 3 | Don't quote integer. | SQL |
if x > 68
print('test') | if x > 68:
print('test') | Colon missing after if. | Python |
name: world
age: 67 | name: world
age: 67 | Correct. | YAML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
x := 76 | x := 76 | Correct. | Go |
#footer {{ color: green; }} | #footer {{ color: green; }} | Correct. | CSS |
values[31] | if values.indices.contains(31) {{ values[31] }} | Check index. | Swift |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
yield b | yield b | Correct yield. | Python |
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