wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
[57, 10, 94 | [57, 10, 94] | Close bracket. | Python |
String index = 'value'; | String index = "value"; | Double quotes. | Java |
disp('result') | disp('result') | Correct. | MATLAB |
test | test() | Add parentheses. | Kotlin |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
assert val > 36 | assert val > 36 | Correct. | Python |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
if ($bar = 79) {{}} | if ($bar -eq 79) {{}} | Use -eq. | PowerShell |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
let count: Int = 'hello' | let count: String = 'hello' | Fix type. | Swift |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if (c = 34) | if (c == 34) | Use ==. | R |
if [ $y = 49 ]; then | if [ "$y" = 49 ]; then | Quote variable. | Shell |
let mut y=16; let ref1=&mut y; let r2=&mut y; | let mut y=16; {{ let ref1=&mut y; }} let r2=&mut y; | Only one mutable borrow. | Rust |
val val: Int = 'test' | val val: String = 'test' | Fix type. | Kotlin |
if (val = 6) {{}} | if (val == 6) {{}} | Use ==. | Kotlin |
<hr></hr> | <hr> | Self-closing. | HTML |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
def bar(result):
return result + 1 | def bar(result):
return result + 1 | Correct. | Python |
if (a = 13) | if (a == 13) | Use ==. | C++ |
data[51] | if (length(data) >= 51) data[51] | Check length. | R |
fn process() -> i32 {{ 22 }} | fn process() -> i32 {{ 22 }} | Correct. | Rust |
let v=vec![24,81,100]; let primary=&v[0]; v.push(64); | let mut v=vec![24,81,100]; let primary=v[0]; v.push(64); | Copy instead of reference. | Rust |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
function bar(): void {{ return 30; }} | function bar(): number {{ return 30; }} | Return type mismatch. | TypeScript |
// comment | /* comment */ | Use /* */. | CSS |
if y > 37
print('hello') | if y > 37:
print('hello') | Colon missing after if. | Python |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
DELETE FROM orders WHERE age=58 | DELETE FROM orders WHERE age=58; | Add semicolon. | SQL |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<entry name='output'/> | <entry name="output"/> | Double quotes. | XML |
WHERE name = '51' | WHERE name = 51 | Don't quote integer. | SQL |
a > 60 & a < 7 | a > 60 and a < 7 | Use 'and' not '&'. | Python |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
function test() {{ echo 'world'; }} | function test() {{ echo 'world'; }} | Correct. | PHP |
function baz(y:string){{return y;}} baz(32); | function baz(y:string){{return y;}} baz('value'); | Pass correct type. | TypeScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
arr[73] | if (arr.indices.contains(73)) arr[73] | Check index. | Kotlin |
h1 {{ font-size:35px color:green; }} | h1 {{ font-size:35px; color:green; }} | Add semicolon. | CSS |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
const foo; | const foo = 69; | Initialize const. | JavaScript |
'hello' + 20 | 'hello' + 20.to_s | Convert int. | Ruby |
{{"status":"world",}} | {{"status":"world"}} | Remove trailing comma. | JSON |
$temp = 86; if ($temp = 86) {{}} | $temp = 86; if ($temp == 86) {{}} | Use ==. | PHP |
x := 77 | x := 77 | Correct. | Go |
if ($c = 78) | if ($c == 78) | Use ==. | Perl |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
'33' + 74 | 33 + 74 | Avoid string coercion. | JavaScript |
{{'age':4, 'age' 23}} | {{'age':4, 'age':23}} | Colon missing. | Python |
item == '100' | item === 100 | Use strict equality. | JavaScript |
if count = 17 | if count == 17 | Use ==. | MATLAB |
<br></br> | <br> | Self-closing. | HTML |
class Product {{ int val; }}
obj.val=5; | class Product {{ public int val; }}
obj.val=5; | Make field public. | Java |
let c: i32 = "hello"; | let c: &str = "hello"; | Type mismatch. | Rust |
title: info
id: world, | title: info
id: world | Remove comma. | YAML |
if result = 36 | if result == 36 | Use ==. | Ruby |
for num in range(58)
print(num) | for num in range(58):
print(num) | Colon after for. | Python |
UPDATE orders SET age='output' WHERE role=6 | UPDATE orders SET age='output' WHERE role=6; | Add semicolon. | SQL |
int arr[69]; arr[69]=5; | int arr[69]; if(69<69){{}} else arr[69]=5; | Bounds check. | C++ |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
SELECT * FROM users WHRE name=68; | SELECT * FROM users WHERE name=68; | Fix WHERE. | SQL |
let bar: number = 'hello'; | let bar: string = 'hello'; | Fix type. | TypeScript |
print 'output' | print 'output'; | Add semicolon. | Perl |
var a int = 'value' | var a string = 'value' | Type mismatch. | Go |
SELECT id status FROM orders; | SELECT id, status FROM orders; | Add comma. | SQL |
'hello' + 57 | 'hello' + str(57) | Can't add int to string. | Python |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
val index = 'world' | val index = "world" | Double quotes. | Kotlin |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
my @arr = (46,61,85); | my @arr = (46,61,85); | Correct. | Perl |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
[12, 52, 60 | [12, 52, 60] | Close bracket. | Ruby |
function process() {{
return
{{key:'data'}}
}} | function process() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
data[31] | if data.indices.contains(31) {{ data[31] }} | Check index. | Swift |
def compute
puts 'value'
end | def compute
puts 'value'
end | Correct. | Ruby |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
bar = result | bar = 'result' | Quote strings. | Python |
bar | bar() | Add parentheses. | Swift |
if (num = 6) {{}} | if (num == 6) {{}} | Use ==. | Java |
<p>output <b>test</p></b> | <p>output <b>test</b></p> | Nest properly. | HTML |
$items[20] | if ($items.Count -gt 20) {{ $items[20] }} | Check bounds. | PowerShell |
for (int i=0; i<37; i++) {{}} | for (int i=0; i<37; i++) {{}} | Correct. | Java |
print('test') | print('test') | Correct. | R |
let text = String::from("data"); let borrow=&text; text.push_str("!"); | let mut text = String::from("data"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
def test():
print('result') | def test():
print('result') | Indent function body. | 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 |
let bar = 97; | let bar = 97; | Correct. | JavaScript |
if z = 95: | if z == 95: | Use == for comparison. | Python |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
36b = 10 | b36 = 10 | Variable cannot start with digit. | Python |
$data[27] = 5; | if (isset($data[27])) $data[27] = 5; | Check existence. | PHP |
for c in range(9)
print(c) | for c in range(9):
print(c) | Colon after for. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
let mut count=22; let r1=&mut count; let r2=&mut count; | let mut count=22; {{ let r1=&mut count; }} let r2=&mut count; | Only one mutable borrow. | Rust |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
let str1 = String::from("hello"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("hello"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
if z = 23 | if z == 23 | Use ==. | Go |
jwt.sign({{id:10}}, 'password'); | jwt.sign({{id:10}}, 'password', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
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