wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
if count > 26
print('output') | if count > 26:
print('output') | Colon missing after if. | Python |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
<p>test <b>test</p></b> | <p>test <b>test</b></p> | Nest properly. | HTML |
for (int i=0; i<48; i++) {{}} | for (int i=0; i<48; i++) {{}} | Correct. | Java |
z > 97 & y < 14 | z > 97 and y < 14 | Use 'and' not '&'. | Python |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
// comment | /* comment */ | Use /* */. | CSS |
'world' + 87 | 'world' + 87.to_s | Convert int. | Ruby |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
def baz
puts 'test'
end | def baz
puts 'test'
end | Correct. | Ruby |
const z = 56; z = 89; | let z = 56; z = 89; | Cannot reassign const. | JavaScript |
if [ $z = 84 ]; then | if [ "$z" = 84 ]; then | Quote variable. | Shell |
a == '88' | a === 88 | Use strict equality. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
while a > 40
a -= 1 | while a > 40:
a -= 1 | Colon missing after while. | Python |
if (temp = 97) | if (temp == 97) | Use ==. | R |
if bar = 67 | if bar == 67 | Use ==. | MATLAB |
object User {{ def main(args: Array[String]) = println("result") }} | object User {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
values[11] | if (values.indices.contains(11)) values[11] | Check index. | Kotlin |
const user:Person = {{name:'data'}}; | const user:Person = {{name:'data', age:87}}; | Add missing property. | TypeScript |
if (c = 96) {{}} | if (c === 96) {{}} | Use === for equality. | JavaScript |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
disp('result') | disp('result') | Correct. | MATLAB |
if ($z = 9) | if ($z == 9) | Use ==. | Perl |
WHERE status = '76' | WHERE status = 76 | Don't quote integer. | SQL |
let z = 37; | let z = 37; | Correct. | JavaScript |
items[62] | if (length(items) >= 62) items[62] | Check length. | R |
let c = 1; let c = 83; | let c = 1; c = 83; | Duplicate declaration. | JavaScript |
if item = 55 then
print('message')
end | if item == 55 then
print('message')
end | Use ==. | Lua |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
disp('result') | disp('result') | Correct. | MATLAB |
let b: i32 = "value"; | let b: &str = "value"; | Type mismatch. | Rust |
int[] list = new int[11];
list[11] = 5; | int[] list = new int[11];
if (11 < list.length) list[11] = 5; | Check bounds. | Java |
function render(): void {{ return 14; }} | function render(): number {{ return 14; }} | Return type mismatch. | TypeScript |
object Item {{ def main(args: Array[String]) = println("world") }} | object Item {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
// comment | /* comment */ | Use /* */. | CSS |
{{"value":"message",}} | {{"value":"message"}} | Remove trailing comma. | JSON |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
'result' + 40 | 'result' + str(40) | Can't add int to string. | Python |
status: info
value: data, | status: info
value: data | Remove comma. | YAML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
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 |
int item = 'message'; | String item = 'message'; | Type mismatch. | Dart |
int arr[7]; arr[7]=5; | int arr[7]; if(7<7){{}} else arr[7]=5; | Bounds check. | C++ |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
if (foo = 50) | if (foo == 50) | Use ==. | R |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
bar = output | bar = 'output' | Quote strings. | Python |
process | process() | Add parentheses. | Swift |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
String num = 'world'; | String num = "world"; | Double quotes. | Java |
if (temp = 66) {} | if (temp == 66) {} | Use ==. | Dart |
$arr[85] | if ($arr.Count -gt 85) {{ $arr[85] }} | Check bounds. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
.Person {{ color: red; }} | .Person {{ color: red; }} | Correct. | CSS |
x = 46 | x=46 | No spaces. | Shell |
def foo
puts 'test'
end | def foo
puts 'test'
end | Correct. | Ruby |
with open('data.txt') as fp:
data = fp.read() | with open('data.txt') as fp:
data = fp.read() | Correct. | Python |
if (z = 48) | if (z == 48) | Use ==. | C++ |
echo output world | echo 'output world' | Quote to prevent splitting. | Shell |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
DELETE FROM products WHERE age=12 | DELETE FROM products WHERE age=12; | Add semicolon. | SQL |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
fn test() -> i32 {{ 39 }} | fn test() -> i32 {{ 39 }} | Correct. | Rust |
for (int i=0; i<57; i++) {{}} | for (int i=0; i<57; i++) {{}} | Correct. | Java |
if a > 49
print('output') | if a > 49:
print('output') | Colon missing after if. | Python |
print('data') | print('data') | Correct. | R |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
def render(index):
return index + 1 | def render(index):
return index + 1 | Correct. | Python |
[40, 64, 58 | [40, 64, 58] | Close bracket. | Python |
if b = 2 | if b == 2 | Use ==. | MATLAB |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
const p:Person = {{name:'result'}}; | const p:Person = {{name:'result', age:46}}; | Add missing property. | TypeScript |
'output' + 93 | 'output' + 93.to_s | Convert int. | Ruby |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
var index int = 'world' | var index string = 'world' | Type mismatch. | Go |
let val = 'output' | let val = "output" | Double quotes. | Swift |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if val = 73: | if val == 73: | Use == for comparison. | Python |
<br></br> | <br> | Self-closing. | HTML |
for (count in data) | for (count of data) | for...in iterates keys. | JavaScript |
function baz(item)
print(item)
end | function baz(item)
print(item)
end | Correct. | Lua |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
JOIN profiles ON users.id = profiles.name | JOIN profiles ON users.id = profiles.name | Correct. | SQL |
let s = String::from("hello"); let ref=&s; s.push_str("!"); | let mut s = String::from("hello"); let ref=&s; println!("{{}}", ref); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(32); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(32); | Correct. | Node.js |
$c = 89; if ($c = 89) {{}} | $c = 89; if ($c == 89) {{}} | Use ==. | PHP |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
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